diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlink/.gitignore b/Examples/SwiftIOPlayground/01LED/LEDBlink/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/01LED/LEDBlink/.gitignore
+++ b/Examples/SwiftIOPlayground/01LED/LEDBlink/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlink/Package.swift b/Examples/SwiftIOPlayground/01LED/LEDBlink/Package.swift
index 8c1a76e..0597e1e 100644
--- a/Examples/SwiftIOPlayground/01LED/LEDBlink/Package.swift
+++ b/Examples/SwiftIOPlayground/01LED/LEDBlink/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LEDBlink",
     dependencies: [
@@ -9,16 +11,14 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LEDBlink",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDBlinkTests",
-            dependencies: ["LEDBlink"]),
     ]
 )
+
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlink/README.md b/Examples/SwiftIOPlayground/01LED/LEDBlink/README.md
deleted file mode 100644
index 778a700..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDBlink/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LEDBlink
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlink/Sources/LEDBlink/LEDBlink.swift b/Examples/SwiftIOPlayground/01LED/LEDBlink/Sources/LEDBlink/LEDBlink.swift
deleted file mode 100644
index 1abc0c6..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDBlink/Sources/LEDBlink/LEDBlink.swift
+++ /dev/null
@@ -1,23 +0,0 @@
-// First import the SwiftIO and MadBoard libraries into the project to use related functionalities.
-import SwiftIO
-import MadBoard
-
-@main
-public struct LEDBlink {
-    public static func main() {
-        // Initialize the specified pin used for digital output.
-        let led = DigitalOut(Id.D18)
-
-        // The code in the loop will run over and over again. 
-        while true {
-            //Output high voltage to turn on the LED.   
-            led.write(true)
-            // Keep the LED on for 1 second.
-            sleep(ms: 1000)
-
-            // Turn off the LED and then keep that state for 1s.
-            led.write(false)
-            sleep(ms: 1000)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlink/Sources/main.swift b/Examples/SwiftIOPlayground/01LED/LEDBlink/Sources/main.swift
new file mode 100644
index 0000000..b98bb45
--- /dev/null
+++ b/Examples/SwiftIOPlayground/01LED/LEDBlink/Sources/main.swift
@@ -0,0 +1,18 @@
+// First import the SwiftIO and MadBoard libraries into the project to use related functionalities.
+import SwiftIO
+import MadBoard
+
+// Initialize the specified pin used for digital output.
+let led = DigitalOut(Id.D18)
+
+// The code in the loop will run over and over again. 
+while true {
+    //Output high voltage to turn on the LED.   
+    led.write(true)
+    // Keep the LED on for 1 second.
+    sleep(ms: 1000)
+
+    // Turn off the LED and then keep that state for 1s.
+    led.write(false)
+    sleep(ms: 1000)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlink/Tests/LEDBlinkTests/LEDBlinkTests.swift b/Examples/SwiftIOPlayground/01LED/LEDBlink/Tests/LEDBlinkTests/LEDBlinkTests.swift
deleted file mode 100644
index 612439f..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDBlink/Tests/LEDBlinkTests/LEDBlinkTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LEDBlink
-
-final class LEDBlinkTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LEDBlink().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/.gitignore b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/.gitignore
+++ b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Package.swift b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Package.swift
index a5427cd..9c5f1b4 100644
--- a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Package.swift
+++ b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LEDBlinkWithTimer",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LEDBlinkWithTimer",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDBlinkWithTimerTests",
-            dependencies: ["LEDBlinkWithTimer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/README.md b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/README.md
deleted file mode 100644
index b6de7e3..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LEDBlinkWithTimer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Sources/LEDBlinkWithTimer/LEDBlinkWithTimer.swift b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Sources/LEDBlinkWithTimer/LEDBlinkWithTimer.swift
deleted file mode 100644
index 4b6586d..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Sources/LEDBlinkWithTimer/LEDBlinkWithTimer.swift
+++ /dev/null
@@ -1,34 +0,0 @@
-// Import the SwiftIO library to control input and output and the MadBoard to use the id of the pins.
-import SwiftIO
-import MadBoard
-
-@main
-public struct LEDBlinkWithTimer {
-    public static func main() {
-        // Initialize a digital pin for LED module.
-        let redLed = DigitalOut(Id.D18)
-
-        // Initialize the onboard blue LED.
-        let blueLed = DigitalOut(Id.BLUE)
-
-        // Initialize a timer for 1500ms.
-        let timer = Timer(period: 1500)
-
-        // Define a new function used to toggle the LED.
-        func ToggleLEDSwitch() {
-            redLed.toggle()
-        }
-
-        // Set an interrupt to reverse the LED state every time the interrupt occurs.
-        timer.setInterrupt(ToggleLEDSwitch)
-
-        // Blink onboard blue LED.
-        while true {
-            blueLed.high()
-            sleep(ms: 500)
-
-            blueLed.low()
-            sleep(ms: 500)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Sources/main.swift b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Sources/main.swift
new file mode 100644
index 0000000..59d451e
--- /dev/null
+++ b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Sources/main.swift
@@ -0,0 +1,29 @@
+// Import the SwiftIO library to control input and output and the MadBoard to use the id of the pins.
+import SwiftIO
+import MadBoard
+
+// Initialize a digital pin for LED module.
+let redLed = DigitalOut(Id.D18)
+
+// Initialize the onboard blue LED.
+let blueLed = DigitalOut(Id.BLUE)
+
+// Initialize a timer for 1500ms.
+let timer = Timer(period: 1500)
+
+// Define a new function used to toggle the LED.
+func ToggleLEDSwitch() {
+    redLed.toggle()
+}
+
+// Set an interrupt to reverse the LED state every time the interrupt occurs.
+timer.setInterrupt(ToggleLEDSwitch)
+
+// Blink onboard blue LED.
+while true {
+    blueLed.high()
+    sleep(ms: 500)
+
+    blueLed.low()
+    sleep(ms: 500)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Tests/LEDBlinkWithTimerTests/LEDBlinkWithTimerTests.swift b/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Tests/LEDBlinkWithTimerTests/LEDBlinkWithTimerTests.swift
deleted file mode 100644
index a90600b..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDBlinkWithTimer/Tests/LEDBlinkWithTimerTests/LEDBlinkWithTimerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LEDBlinkWithTimer
-
-final class LEDBlinkWithTimerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LEDBlinkWithTimer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/.gitignore b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/.gitignore
+++ b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Package.swift b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Package.swift
index c7ec4f1..357cfd6 100644
--- a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Package.swift
+++ b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LEDMorseCode",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LEDMorseCode",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDMorseCodeTests",
-            dependencies: ["LEDMorseCode"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/README.md b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/README.md
deleted file mode 100644
index 9a22a39..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LEDMorseCode
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Sources/LEDMorseCode/LEDMorseCode.swift b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Sources/LEDMorseCode/LEDMorseCode.swift
deleted file mode 100644
index 322310f..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Sources/LEDMorseCode/LEDMorseCode.swift
+++ /dev/null
@@ -1,46 +0,0 @@
-// Import the libraries to use all their functionalities.
-import SwiftIO
-import MadBoard
-
-@main
-public struct LEDMorseCode {
-    public static func main() {
-        // Initialize the digital output pin.
-        let led = DigitalOut(Id.D18)
-
-        // Define the LED states to represent the letter s and o.
-        let sSignal = [false, false, false]
-        let oSignal = [true, true ,true]
-
-        // Set the LED blink rate according to the values in the array.
-        func send(_ values: [Bool], to light: DigitalOut) {
-            // The duration of slow flash and quick flash.
-            let long = 1000
-            let short = 500
-
-            // Iterate all the values in the array. 
-            // If the value is true, the LED will be on for 1s, which is a slow flash.
-            // And if it’s false, the LED will be on for 0.5s, which is a quick flash.
-            for value in values {
-                light.high()
-                if value {
-                    sleep(ms: long)
-                } else {
-                    sleep(ms: short)
-                }
-                light.low()
-                sleep(ms: short)
-            }
-        }
-
-        // Blink the LED.
-        // At first, the LED starts 3 fast blink to represent s, then 3 slow blink to represent o, and 3 fast blink again.
-        // Wait 1s before repeating again.
-        while true {
-            send(sSignal, to: led)
-            send(oSignal, to: led)
-            send(sSignal, to: led)
-            sleep(ms: 1000)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Sources/main.swift b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Sources/main.swift
new file mode 100644
index 0000000..1f5e699
--- /dev/null
+++ b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Sources/main.swift
@@ -0,0 +1,41 @@
+// Import the libraries to use all their functionalities.
+import SwiftIO
+import MadBoard
+
+// Initialize the digital output pin.
+let led = DigitalOut(Id.D18)
+
+// Define the LED states to represent the letter s and o.
+let sSignal = [false, false, false]
+let oSignal = [true, true ,true]
+
+// Set the LED blink rate according to the values in the array.
+func send(_ values: [Bool], to light: DigitalOut) {
+    // The duration of slow flash and quick flash.
+    let long = 1000
+    let short = 500
+
+    // Iterate all the values in the array. 
+    // If the value is true, the LED will be on for 1s, which is a slow flash.
+    // And if it’s false, the LED will be on for 0.5s, which is a quick flash.
+    for value in values {
+        light.high()
+        if value {
+            sleep(ms: long)
+        } else {
+            sleep(ms: short)
+        }
+        light.low()
+        sleep(ms: short)
+    }
+}
+
+// Blink the LED.
+// At first, the LED starts 3 fast blink to represent s, then 3 slow blink to represent o, and 3 fast blink again.
+// Wait 1s before repeating again.
+while true {
+    send(sSignal, to: led)
+    send(oSignal, to: led)
+    send(sSignal, to: led)
+    sleep(ms: 1000)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Tests/LEDMorseCodeTests/LEDMorseCodeTests.swift b/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Tests/LEDMorseCodeTests/LEDMorseCodeTests.swift
deleted file mode 100644
index b99c5f8..0000000
--- a/Examples/SwiftIOPlayground/01LED/LEDMorseCode/Tests/LEDMorseCodeTests/LEDMorseCodeTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LEDMorseCode
-
-final class LEDMorseCodeTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LEDMorseCode().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/01LED/RGBLED/.gitignore b/Examples/SwiftIOPlayground/01LED/RGBLED/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/01LED/RGBLED/.gitignore
+++ b/Examples/SwiftIOPlayground/01LED/RGBLED/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/01LED/RGBLED/Package.swift b/Examples/SwiftIOPlayground/01LED/RGBLED/Package.swift
index 9629684..2e28844 100644
--- a/Examples/SwiftIOPlayground/01LED/RGBLED/Package.swift
+++ b/Examples/SwiftIOPlayground/01LED/RGBLED/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "RGBLED",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "RGBLED",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
             ]),
-        .testTarget(
-            name: "RGBLEDTests",
-            dependencies: ["RGBLED"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/01LED/RGBLED/README.md b/Examples/SwiftIOPlayground/01LED/RGBLED/README.md
deleted file mode 100644
index 7844227..0000000
--- a/Examples/SwiftIOPlayground/01LED/RGBLED/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# RGBLED
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/01LED/RGBLED/Sources/RGBLED/RGBLED.swift b/Examples/SwiftIOPlayground/01LED/RGBLED/Sources/RGBLED/RGBLED.swift
deleted file mode 100644
index 9bfa5a5..0000000
--- a/Examples/SwiftIOPlayground/01LED/RGBLED/Sources/RGBLED/RGBLED.swift
+++ /dev/null
@@ -1,43 +0,0 @@
-import SwiftIO
-import MadBoard
-
-@main
-public struct RGBLED {
-    public static func main() {
-        // Initialize the built-in red, green, blue LED.
-        // They need a low level to be turned on.
-        // So set the digital value of true to turn them off in the beginning.
-        let red = DigitalOut(Id.RED, value: true)
-        let green = DigitalOut(Id.GREEN, value: true)
-        let blue = DigitalOut(Id.BLUE, value: true)
-        
-        while true {
-            // Red.
-            setRGB(true, false, false)
-            // Green.
-            setRGB(false, true, false)
-            // Blue.
-            setRGB(false, false, true)
-            // Yellow (red + green).
-            setRGB(true, true, false)
-            // Magenta (red + blue).
-            setRGB(true, false, true)
-            // Cyan (green + blue).
-            setRGB(false, true, true)
-            // White (red + green + blue). 
-            setRGB(true, true, true)
-            // Off.
-            setRGB(false, false, false)
-        }
-
-        // Control red, green and blue LED with the given values.
-        // Apply low voltage to turn on the built-in LEDs. 
-        // For example, if you want the red LED on, you should write false.
-        func setRGB(_ redOn: Bool, _ greenOn: Bool, _ blueOn: Bool) {
-            red.write(!redOn)
-            green.write(!greenOn)
-            blue.write(!blueOn)
-            sleep(ms: 1000)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/01LED/RGBLED/Sources/main.swift b/Examples/SwiftIOPlayground/01LED/RGBLED/Sources/main.swift
new file mode 100644
index 0000000..b4d9f94
--- /dev/null
+++ b/Examples/SwiftIOPlayground/01LED/RGBLED/Sources/main.swift
@@ -0,0 +1,38 @@
+import SwiftIO
+import MadBoard
+
+// Initialize the built-in red, green, blue LED.
+// They need a low level to be turned on.
+// So set the digital value of true to turn them off in the beginning.
+let red = DigitalOut(Id.RED, value: true)
+let green = DigitalOut(Id.GREEN, value: true)
+let blue = DigitalOut(Id.BLUE, value: true)
+
+while true {
+    // Red.
+    setRGB(true, false, false)
+    // Green.
+    setRGB(false, true, false)
+    // Blue.
+    setRGB(false, false, true)
+    // Yellow (red + green).
+    setRGB(true, true, false)
+    // Magenta (red + blue).
+    setRGB(true, false, true)
+    // Cyan (green + blue).
+    setRGB(false, true, true)
+    // White (red + green + blue). 
+    setRGB(true, true, true)
+    // Off.
+    setRGB(false, false, false)
+}
+
+// Control red, green and blue LED with the given values.
+// Apply low voltage to turn on the built-in LEDs. 
+// For example, if you want the red LED on, you should write false.
+func setRGB(_ redOn: Bool, _ greenOn: Bool, _ blueOn: Bool) {
+    red.write(!redOn)
+    green.write(!greenOn)
+    blue.write(!blueOn)
+    sleep(ms: 1000)
+}
diff --git a/Examples/SwiftIOPlayground/01LED/RGBLED/Tests/RGBLEDTests/RGBLEDTests.swift b/Examples/SwiftIOPlayground/01LED/RGBLED/Tests/RGBLEDTests/RGBLEDTests.swift
deleted file mode 100644
index 67a98db..0000000
--- a/Examples/SwiftIOPlayground/01LED/RGBLED/Tests/RGBLEDTests/RGBLEDTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import RGBLED
-
-final class RGBLEDTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(RGBLED().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/.gitignore b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/.gitignore
+++ b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Package.swift b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Package.swift
index dd6a24f..64921f4 100644
--- a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Package.swift
+++ b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "ButtonInterrupt",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "ButtonInterrupt",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "ButtonInterruptTests",
-            dependencies: ["ButtonInterrupt"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/README.md b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/README.md
deleted file mode 100644
index 47f9400..0000000
--- a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ButtonInterrupt
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Sources/ButtonInterrupt/ButtonInterrupt.swift b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Sources/ButtonInterrupt/ButtonInterrupt.swift
deleted file mode 100644
index e57d54d..0000000
--- a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Sources/ButtonInterrupt/ButtonInterrupt.swift
+++ /dev/null
@@ -1,27 +0,0 @@
-// Toggle the LED after you press the buttton by detecting the rising edge.
-
-// Import the SwiftIO library to control input and output and the MadBoard to use the id of the pins.
-import SwiftIO
-import MadBoard
-
-@main
-public struct ButtonInterrupt {
-    public static func main() {
-        // Initialize the input pin for the button and output pin for the LED.
-        let button = DigitalIn(Id.D1)
-        let led = DigitalOut(Id.D18)
-
-        // Define a new function used to toggle the LED.
-        func toggleLed() {
-            led.toggle()
-        }
-
-        // Set the interrupt to detect the rising edge. Once detected, the LED will change its state.
-        button.setInterrupt(.rising, callback: toggleLed)
-
-        // Keep sleeping if the interrupt hasn't been triggered.
-        while true {
-            sleep(ms: 1000)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Sources/main.swift b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Sources/main.swift
new file mode 100644
index 0000000..ff77bc6
--- /dev/null
+++ b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Sources/main.swift
@@ -0,0 +1,23 @@
+// Toggle the LED after you press the buttton by detecting the rising edge.
+
+// Import the SwiftIO library to control input and output and the MadBoard to use the id of the pins.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the input pin for the button and output pin for the LED.
+let button = DigitalIn(Id.D1)
+let led = DigitalOut(Id.D18)
+
+// Define a new function used to toggle the LED.
+func toggleLed() {
+    led.toggle()
+}
+
+// Set the interrupt to detect the rising edge. Once detected, the LED will change its state.
+button.setInterrupt(.rising, callback: toggleLed)
+
+// Keep sleeping if the interrupt hasn't been triggered.
+while true {
+    sleep(ms: 1000)
+}
diff --git a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Tests/ButtonInterruptTests/ButtonInterruptTests.swift b/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Tests/ButtonInterruptTests/ButtonInterruptTests.swift
deleted file mode 100644
index 72080bd..0000000
--- a/Examples/SwiftIOPlayground/02Button/ButtonInterrupt/Tests/ButtonInterruptTests/ButtonInterruptTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import ButtonInterrupt
-
-final class ButtonInterruptTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(ButtonInterrupt().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/.gitignore b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/.gitignore
+++ b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Package.swift b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Package.swift
index 736b617..f896a21 100644
--- a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Package.swift
+++ b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "MomentaryLEDSwitch",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "MomentaryLEDSwitch",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "MomentaryLEDSwitchTests",
-            dependencies: ["MomentaryLEDSwitch"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/README.md b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/README.md
deleted file mode 100644
index c66f3ec..0000000
--- a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# MomentaryLEDSwitch
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Sources/MomentaryLEDSwitch/MomentaryLEDSwitch.swift b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Sources/MomentaryLEDSwitch/MomentaryLEDSwitch.swift
deleted file mode 100644
index 4b20b3f..0000000
--- a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Sources/MomentaryLEDSwitch/MomentaryLEDSwitch.swift
+++ /dev/null
@@ -1,34 +0,0 @@
-// When you press the button, the LED turns on. 
-// If yo continue to hold it, the LED stays on.
-// After you release it, the LED turns off.
-
-// Import the SwiftIO library to control input and output and the MadBoard to use the id of the pins.
-import SwiftIO
-import MadBoard
-
-@main
-public struct MomentaryLEDSwitch {
-    public static func main() {
-        // Initialize the input pin for the button and output pin for the LED.
-        let led = DigitalOut(Id.D18)
-        let button = DigitalIn(Id.D1)
-
-        // Keep repeating the following steps.
-        while true {
-            // Read the input pin to check the button state.
-            let buttonPressed = button.read()
-
-            // If the value is true which means the button is pressed, turn on the LED. Otherwise, turn off the LED.
-            if buttonPressed == true {
-                led.write(true)
-            } else {
-                led.write(false)
-            }
-            
-            // Alternatively
-            // led.write(button.read())
-
-            sleep(ms: 10)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Sources/main.swift b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Sources/main.swift
new file mode 100644
index 0000000..9f58cd7
--- /dev/null
+++ b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Sources/main.swift
@@ -0,0 +1,30 @@
+// When you press the button, the LED turns on. 
+// If yo continue to hold it, the LED stays on.
+// After you release it, the LED turns off.
+
+// Import the SwiftIO library to control input and output and the MadBoard to use the id of the pins.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the input pin for the button and output pin for the LED.
+let led = DigitalOut(Id.D18)
+let button = DigitalIn(Id.D1)
+
+// Keep repeating the following steps.
+while true {
+    // Read the input pin to check the button state.
+    let buttonPressed = button.read()
+
+    // If the value is true which means the button is pressed, turn on the LED. Otherwise, turn off the LED.
+    if buttonPressed == true {
+        led.write(true)
+    } else {
+        led.write(false)
+    }
+    
+    // Alternatively
+    // led.write(button.read())
+
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Tests/MomentaryLEDSwitchTests/MomentaryLEDSwitchTests.swift b/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Tests/MomentaryLEDSwitchTests/MomentaryLEDSwitchTests.swift
deleted file mode 100644
index 67048bb..0000000
--- a/Examples/SwiftIOPlayground/02Button/MomentaryLEDSwitch/Tests/MomentaryLEDSwitchTests/MomentaryLEDSwitchTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import MomentaryLEDSwitch
-
-final class MomentaryLEDSwitchTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(MomentaryLEDSwitch().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/OnOffButtons/.gitignore b/Examples/SwiftIOPlayground/02Button/OnOffButtons/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/02Button/OnOffButtons/.gitignore
+++ b/Examples/SwiftIOPlayground/02Button/OnOffButtons/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Package.swift b/Examples/SwiftIOPlayground/02Button/OnOffButtons/Package.swift
index a0f765b..10f9aa2 100644
--- a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Package.swift
+++ b/Examples/SwiftIOPlayground/02Button/OnOffButtons/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "OnOffButtons",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "OnOffButtons",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "OnOffButtonsTests",
-            dependencies: ["OnOffButtons"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/02Button/OnOffButtons/README.md b/Examples/SwiftIOPlayground/02Button/OnOffButtons/README.md
deleted file mode 100644
index 317b484..0000000
--- a/Examples/SwiftIOPlayground/02Button/OnOffButtons/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# OnOffButtons
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Sources/OnOffButtons/OnOffButtons.swift b/Examples/SwiftIOPlayground/02Button/OnOffButtons/Sources/OnOffButtons/OnOffButtons.swift
deleted file mode 100644
index 71d6eaf..0000000
--- a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Sources/OnOffButtons/OnOffButtons.swift
+++ /dev/null
@@ -1,61 +0,0 @@
-// Control the LED with two dedicated buttons.
-// The button D1 is used to turn on LED and D19 is to turn off it.
-
-// SwiftIO is used to set all input and output.
-import SwiftIO
-// MadBoard is for pin ids.
-import MadBoard
-
-@main
-public struct OnOffButtons {
-    public static func main() {
-        // Initialize the pin for the button used to turn ON LED.
-        let onButton = DigitalIn(Id.D1)
-        // Initialize the pin for the button used to turn OFF the LED.
-        let offButton = DigitalIn(Id.D19)
-        let led = DigitalOut(Id.D18)
-
-        // Store the current LED state.
-        var ledOn = false
-
-        // Store the last button state used to decide whether the button is released now.
-        var onButtonPressed = false
-        var offButtonPressed = false
-
-        while true {
-            if ledOn {
-                // If the LED is on, check if the off button (D19) is pressed. 
-                // If so, turn off the LED after the button is released.
-
-                // Update the OFF button state if it is pressed. 
-                if offButton.read() {
-                    offButtonPressed = true
-                }
-
-                // If the OFF button has been pressed and is released now, turn off the LED and update all states.
-                if offButtonPressed && !offButton.read() {
-                    led.low()
-                    offButtonPressed = false
-                    ledOn = false
-                }
-            } else {
-                // If the LED is off, check if the on button (D1) is pressed. 
-                // If so, turn on the LED after the button is released.
-
-                // Update the ON button state if it is pressed. 
-                if onButton.read() {
-                    onButtonPressed = true
-                }
-
-                // If the ON button has been pressed and is released now, turn on the LED and update all states.
-                if onButtonPressed && !onButton.read() {
-                    led.high()
-                    onButtonPressed = false
-                    ledOn = true
-                }
-            }
-            
-            sleep(ms: 10)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Sources/main.swift b/Examples/SwiftIOPlayground/02Button/OnOffButtons/Sources/main.swift
new file mode 100644
index 0000000..48c02a1
--- /dev/null
+++ b/Examples/SwiftIOPlayground/02Button/OnOffButtons/Sources/main.swift
@@ -0,0 +1,57 @@
+// Control the LED with two dedicated buttons.
+// The button D1 is used to turn on LED and D19 is to turn off it.
+
+// SwiftIO is used to set all input and output.
+import SwiftIO
+// MadBoard is for pin ids.
+import MadBoard
+
+
+// Initialize the pin for the button used to turn ON LED.
+let onButton = DigitalIn(Id.D1)
+// Initialize the pin for the button used to turn OFF the LED.
+let offButton = DigitalIn(Id.D19)
+let led = DigitalOut(Id.D18)
+
+// Store the current LED state.
+var ledOn = false
+
+// Store the last button state used to decide whether the button is released now.
+var onButtonPressed = false
+var offButtonPressed = false
+
+while true {
+    if ledOn {
+        // If the LED is on, check if the off button (D19) is pressed. 
+        // If so, turn off the LED after the button is released.
+
+        // Update the OFF button state if it is pressed. 
+        if offButton.read() {
+            offButtonPressed = true
+        }
+
+        // If the OFF button has been pressed and is released now, turn off the LED and update all states.
+        if offButtonPressed && !offButton.read() {
+            led.low()
+            offButtonPressed = false
+            ledOn = false
+        }
+    } else {
+        // If the LED is off, check if the on button (D1) is pressed. 
+        // If so, turn on the LED after the button is released.
+
+        // Update the ON button state if it is pressed. 
+        if onButton.read() {
+            onButtonPressed = true
+        }
+
+        // If the ON button has been pressed and is released now, turn on the LED and update all states.
+        if onButtonPressed && !onButton.read() {
+            led.high()
+            onButtonPressed = false
+            ledOn = true
+        }
+    }
+    
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Tests/OnOffButtonsTests/OnOffButtonsTests.swift b/Examples/SwiftIOPlayground/02Button/OnOffButtons/Tests/OnOffButtonsTests/OnOffButtonsTests.swift
deleted file mode 100644
index 76b9fa5..0000000
--- a/Examples/SwiftIOPlayground/02Button/OnOffButtons/Tests/OnOffButtonsTests/OnOffButtonsTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import OnOffButtons
-
-final class OnOffButtonsTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(OnOffButtons().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/.gitignore b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/.gitignore
+++ b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Package.swift b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Package.swift
index 3f702c5..e4b5d06 100644
--- a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Package.swift
+++ b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "ToggleLEDSwitch",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "ToggleLEDSwitch",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "ToggleLEDSwitchTests",
-            dependencies: ["ToggleLEDSwitch"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/README.md b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/README.md
deleted file mode 100644
index 836acca..0000000
--- a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ToggleLEDSwitch
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Sources/ToggleLEDSwitch/ToggleLEDSwitch.swift b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Sources/ToggleLEDSwitch/ToggleLEDSwitch.swift
deleted file mode 100644
index afb72e6..0000000
--- a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Sources/ToggleLEDSwitch/ToggleLEDSwitch.swift
+++ /dev/null
@@ -1,31 +0,0 @@
-// After the button (D1) is pressed and released, the LED (D19) is toggled.
-
-// Import the SwiftIO library to control input and output and 
-// the MadBoard to use the id of the pins.
-import SwiftIO
-import MadBoard
-
-@main
-public struct ToggleLEDSwitch {
-    public static func main() {
-        // Initialize the input pin for the button and output pin for the LED.
-        let led = DigitalOut(Id.D18)
-        let button = DigitalIn(Id.D1)
-
-        var buttonPressed = false
-
-        while true {
-            // If buttonPressing is false, the button is released. 
-            // Besides, if buttonPressed is true, it means the button has been pressed.
-            // So it checks if the button has been pressed and released. 
-            // If so, toggle the LED.
-            let buttonPressing = button.read()
-            if !buttonPressing && buttonPressed {
-                led.toggle()
-            }
-            // Store the latest button state.
-            buttonPressed = buttonPressing
-            sleep(ms: 10)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Sources/main.swift b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Sources/main.swift
new file mode 100644
index 0000000..dee57dc
--- /dev/null
+++ b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Sources/main.swift
@@ -0,0 +1,27 @@
+// After the button (D1) is pressed and released, the LED (D19) is toggled.
+
+// Import the SwiftIO library to control input and output and 
+// the MadBoard to use the id of the pins.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the input pin for the button and output pin for the LED.
+let led = DigitalOut(Id.D18)
+let button = DigitalIn(Id.D1)
+
+var buttonPressed = false
+
+while true {
+    // If buttonPressing is false, the button is released. 
+    // Besides, if buttonPressed is true, it means the button has been pressed.
+    // So it checks if the button has been pressed and released. 
+    // If so, toggle the LED.
+    let buttonPressing = button.read()
+    if !buttonPressing && buttonPressed {
+        led.toggle()
+    }
+    // Store the latest button state.
+    buttonPressed = buttonPressing
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Tests/ToggleLEDSwitchTests/ToggleLEDSwitchTests.swift b/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Tests/ToggleLEDSwitchTests/ToggleLEDSwitchTests.swift
deleted file mode 100644
index e4dcbe3..0000000
--- a/Examples/SwiftIOPlayground/02Button/ToggleLEDSwitch/Tests/ToggleLEDSwitchTests/ToggleLEDSwitchTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import ToggleLEDSwitch
-
-final class ToggleLEDSwitchTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(ToggleLEDSwitch().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/.gitignore b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/.gitignore
+++ b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Package.swift b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Package.swift
index 7eafdd8..114aa05 100644
--- a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Package.swift
+++ b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "TwoWayLEDSwitches",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "TwoWayLEDSwitches",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "TwoWayLEDSwitchesTests",
-            dependencies: ["TwoWayLEDSwitches"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/README.md b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/README.md
deleted file mode 100644
index fb0c747..0000000
--- a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# TwoWayLEDSwitches
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Sources/TwoWayLEDSwitches/TwoWayLEDSwitches.swift b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Sources/TwoWayLEDSwitches/TwoWayLEDSwitches.swift
deleted file mode 100644
index e8df3da..0000000
--- a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Sources/TwoWayLEDSwitches/TwoWayLEDSwitches.swift
+++ /dev/null
@@ -1,37 +0,0 @@
-// Pressing any of the two buttons (D1, D19) will toggle the LED. 
-// The LED state is updated after that button is pressed.
-
-// SwiftIO is used to set input and output of the pins.
-import SwiftIO
-// MadBoard is for pin ids.
-import MadBoard
-
-@main
-public struct TwoWayLEDSwitches {
-    public static func main() {
-        // Initialize the pins for two buttons and the LED.
-        let button0 = DigitalIn(Id.D1)
-        let button1 = DigitalIn(Id.D19)
-        let led = DigitalOut(Id.D18)
-
-        // Store if the LED state is toggled after a button press.
-        // It ensures the LED state doesn't change again when button is being pressed.
-        var ledToggled = false
-
-        // Toggle the LED after any of the two buttons are pressed.
-        while true {
-            // When any of the buttons are pressed, toggle the LED.
-            if !ledToggled && (button0.read() || button1.read()) {
-                led.toggle()
-                ledToggled = true
-            }
-
-            // If both buttons are released, update the state to wait for next press.
-            if !button0.read() && !button1.read() {
-                ledToggled = false
-            }
-
-            sleep(ms: 10)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Sources/main.swift b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Sources/main.swift
new file mode 100644
index 0000000..b3afd7a
--- /dev/null
+++ b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Sources/main.swift
@@ -0,0 +1,33 @@
+// Pressing any of the two buttons (D1, D19) will toggle the LED. 
+// The LED state is updated after that button is pressed.
+
+// SwiftIO is used to set input and output of the pins.
+import SwiftIO
+// MadBoard is for pin ids.
+import MadBoard
+
+
+// Initialize the pins for two buttons and the LED.
+let button0 = DigitalIn(Id.D1)
+let button1 = DigitalIn(Id.D19)
+let led = DigitalOut(Id.D18)
+
+// Store if the LED state is toggled after a button press.
+// It ensures the LED state doesn't change again when button is being pressed.
+var ledToggled = false
+
+// Toggle the LED after any of the two buttons are pressed.
+while true {
+    // When any of the buttons are pressed, toggle the LED.
+    if !ledToggled && (button0.read() || button1.read()) {
+        led.toggle()
+        ledToggled = true
+    }
+
+    // If both buttons are released, update the state to wait for next press.
+    if !button0.read() && !button1.read() {
+        ledToggled = false
+    }
+
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Tests/TwoWayLEDSwitchesTests/TwoWayLEDSwitchesTests.swift b/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Tests/TwoWayLEDSwitchesTests/TwoWayLEDSwitchesTests.swift
deleted file mode 100644
index 9b1f34b..0000000
--- a/Examples/SwiftIOPlayground/02Button/TwoWayLEDSwitches/Tests/TwoWayLEDSwitchesTests/TwoWayLEDSwitchesTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import TwoWayLEDSwitches
-
-final class TwoWayLEDSwitchesTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(TwoWayLEDSwitches().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/.gitignore b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/.gitignore
+++ b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Package.swift b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Package.swift
index 2fd9cee..bc3148b 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Package.swift
+++ b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "BreathingLED",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "BreathingLED",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "BreathingLEDTests",
-            dependencies: ["BreathingLED"]),
     ]
-)
+)
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/README.md b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/README.md
deleted file mode 100644
index 54613ed..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# BreathingLED
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Sources/BreathingLED/BreathingLED.swift b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Sources/BreathingLED/BreathingLED.swift
deleted file mode 100644
index 7ee9c57..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Sources/BreathingLED/BreathingLED.swift
+++ /dev/null
@@ -1,46 +0,0 @@
-// Import the SwiftIO library to set the input and output and the MadBoard to use the pin id.
-import SwiftIO
-import MadBoard
-
-@main
-public struct BreathingLED {
-    public static func main() {
-        // Initialize a PWM output pin for the LED.
-        let led = PWMOut(Id.PWM4A)
-
-        // Store the maximum and minimum values of the duty cycle to two constants. 
-        let maxDutycycle: Float = 1.0
-        let minDutycycle: Float = 0.0
-
-        // Set the change of duty cycle for each action.
-        let stepDutycycle: Float = 0.01
-
-        // Create a variable to store the varying duty cycle.
-        var dutycycle: Float = 0.0
-
-        // A condition used to decide whether to increase or decrease the duty cycle. 
-        var upDirection = true
-
-        while true {
-            // Output a PWM signal with the specified duty cycle to control LED brightness.
-            led.setDutycycle(dutycycle)
-            // Keep each brightness last for 10ms, or you may not see the changes.
-            sleep(ms: 10)
-
-            // Increase or decrease the duty cycle within its range according to the value of upDirection.
-            if upDirection {
-                dutycycle += stepDutycycle
-                if dutycycle >= maxDutycycle {
-                    upDirection = false
-                    dutycycle = maxDutycycle
-                }
-            } else {
-                dutycycle -= stepDutycycle
-                if dutycycle <= minDutycycle {
-                    upDirection = true
-                    dutycycle = minDutycycle
-                }
-            }
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Sources/main.swift b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Sources/main.swift
new file mode 100644
index 0000000..98e484d
--- /dev/null
+++ b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Sources/main.swift
@@ -0,0 +1,42 @@
+// Import the SwiftIO library to set the input and output and the MadBoard to use the pin id.
+import SwiftIO
+import MadBoard
+
+
+// Initialize a PWM output pin for the LED.
+let led = PWMOut(Id.PWM4A)
+
+// Store the maximum and minimum values of the duty cycle to two constants. 
+let maxDutycycle: Float = 1.0
+let minDutycycle: Float = 0.0
+
+// Set the change of duty cycle for each action.
+let stepDutycycle: Float = 0.01
+
+// Create a variable to store the varying duty cycle.
+var dutycycle: Float = 0.0
+
+// A condition used to decide whether to increase or decrease the duty cycle. 
+var upDirection = true
+
+while true {
+    // Output a PWM signal with the specified duty cycle to control LED brightness.
+    led.setDutycycle(dutycycle)
+    // Keep each brightness last for 10ms, or you may not see the changes.
+    sleep(ms: 10)
+
+    // Increase or decrease the duty cycle within its range according to the value of upDirection.
+    if upDirection {
+        dutycycle += stepDutycycle
+        if dutycycle >= maxDutycycle {
+            upDirection = false
+            dutycycle = maxDutycycle
+        }
+    } else {
+        dutycycle -= stepDutycycle
+        if dutycycle <= minDutycycle {
+            upDirection = true
+            dutycycle = minDutycycle
+        }
+    }
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Tests/BreathingLEDTests/BreathingLEDTests.swift b/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Tests/BreathingLEDTests/BreathingLEDTests.swift
deleted file mode 100644
index abc92a2..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/BreathingLED/Tests/BreathingLEDTests/BreathingLEDTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import BreathingLED
-
-final class BreathingLEDTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(BreathingLED().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/.gitignore b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/.gitignore
+++ b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Package.swift b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Package.swift
index dd7bd01..193c6a9 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Package.swift
+++ b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "ButtonDimmer",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "ButtonDimmer",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "ButtonDimmerTests",
-            dependencies: ["ButtonDimmer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/README.md b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/README.md
deleted file mode 100644
index 86711a3..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ButtonDimmer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Sources/ButtonDimmer/ButtonDimmer.swift b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Sources/ButtonDimmer/ButtonDimmer.swift
deleted file mode 100644
index 04040da..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Sources/ButtonDimmer/ButtonDimmer.swift
+++ /dev/null
@@ -1,50 +0,0 @@
-// Import the SwiftIO library to set the input and output and the MadBoard to use the pin id.
-import SwiftIO
-import MadBoard
-
-@main
-public struct ButtonDimmer {
-    public static func main() {
-        // Initialize the PWM pin.
-        let led = PWMOut(Id.PWM4A)
-
-        // Store the max and min values of duty cycle to two constants. 
-        let maxDutycycle: Float = 1.0
-        let minDutycycle: Float = 0.0
-
-        // The variation of duty cycle per button press.
-        let stepDutycycle: Float = 0.1
-
-        // Create a variable to store the value of duty cycle.
-        var dutycycle: Float = 0.0
-
-        // Initialize the digital pins. downButton is to dim the LED and the upButton is to brighten the LED.
-        let downButton = DigitalIn(Id.D1)
-        let upButton = DigitalIn(Id.D19)
-
-        var dutycycleChanged = false
-
-        // Each time this button is pressed, the LED will dim a little until it reaches the minimum brightness.
-        downButton.setInterrupt(.rising) {
-            dutycycle -= stepDutycycle
-            dutycycle = max(dutycycle, minDutycycle)
-            dutycycleChanged = true
-        }
-
-        // Once this button is pressed, the LED becomes brighter until it reaches the maximum brightness.
-        upButton.setInterrupt(.rising) {
-            dutycycle += stepDutycycle
-            dutycycle = min(dutycycle, maxDutycycle)
-            dutycycleChanged = true
-        }
-
-        // Update the duty cycle of PWM signal to change the LED brightness.
-        while true {
-            if dutycycleChanged {
-                led.setDutycycle(dutycycle)
-                dutycycleChanged = false
-            }
-            sleep(ms: 10)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Sources/main.swift b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Sources/main.swift
new file mode 100644
index 0000000..653e992
--- /dev/null
+++ b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Sources/main.swift
@@ -0,0 +1,46 @@
+// Import the SwiftIO library to set the input and output and the MadBoard to use the pin id.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the PWM pin.
+let led = PWMOut(Id.PWM4A)
+
+// Store the max and min values of duty cycle to two constants. 
+let maxDutycycle: Float = 1.0
+let minDutycycle: Float = 0.0
+
+// The variation of duty cycle per button press.
+let stepDutycycle: Float = 0.1
+
+// Create a variable to store the value of duty cycle.
+var dutycycle: Float = 0.0
+
+// Initialize the digital pins. downButton is to dim the LED and the upButton is to brighten the LED.
+let downButton = DigitalIn(Id.D1)
+let upButton = DigitalIn(Id.D19)
+
+var dutycycleChanged = false
+
+// Each time this button is pressed, the LED will dim a little until it reaches the minimum brightness.
+downButton.setInterrupt(.rising) {
+    dutycycle -= stepDutycycle
+    dutycycle = max(dutycycle, minDutycycle)
+    dutycycleChanged = true
+}
+
+// Once this button is pressed, the LED becomes brighter until it reaches the maximum brightness.
+upButton.setInterrupt(.rising) {
+    dutycycle += stepDutycycle
+    dutycycle = min(dutycycle, maxDutycycle)
+    dutycycleChanged = true
+}
+
+// Update the duty cycle of PWM signal to change the LED brightness.
+while true {
+    if dutycycleChanged {
+        led.setDutycycle(dutycycle)
+        dutycycleChanged = false
+    }
+    sleep(ms: 10)
+}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Tests/ButtonDimmerTests/ButtonDimmerTests.swift b/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Tests/ButtonDimmerTests/ButtonDimmerTests.swift
deleted file mode 100644
index b3cd1d6..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/ButtonDimmer/Tests/ButtonDimmerTests/ButtonDimmerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import ButtonDimmer
-
-final class ButtonDimmerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(ButtonDimmer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/.gitignore b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/.gitignore
+++ b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Package.swift b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Package.swift
index e927226..47fbf19 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Package.swift
+++ b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LEDPatternChange",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LEDPatternChange",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDPatternChangeTests",
-            dependencies: ["LEDPatternChange"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/README.md b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/README.md
deleted file mode 100644
index 55f1299..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LEDPatternChange
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Sources/LEDPatternChange/LEDPatternChange.swift b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Sources/LEDPatternChange/LEDPatternChange.swift
deleted file mode 100644
index 59e5659..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Sources/LEDPatternChange/LEDPatternChange.swift
+++ /dev/null
@@ -1,114 +0,0 @@
-// Switch the LED pattern by pressing the button.
-// The LED patterns are: constant off, constant on, blink, breathing.
-
-import SwiftIO
-import MadBoard
-
-@main
-public struct LEDPatternChange {
-    public static func main() {
-        let led = PWMOut(Id.PWM4A)
-        let button = DigitalIn(Id.D1)
-
-        // Store the maximum and minimum values of the duty cycle to two constants. 
-        let maxDutycycle: Float = 1.0
-        let minDutycycle: Float = 0.0
-
-        var dutycycle: Float = 0.0
-        var stepDutycycle: Float = 0.01
-
-        // The duration in ms of each loop.
-        let loopDuration = 10
-        // Make the LED on for 500ms and off for 500ms.
-        let blinkPeriod = 1000
-        var blinkTime = 0
-
-        var patternIndex = 0
-        var changePattern = false
-
-        // Set the duty cycle depending on the pattern.
-        resetDutycycle()
-
-        var buttonPressed = false
-
-        // If the button has been pressed and is released now, change to the next pattern.
-        button.setInterrupt(.falling) {
-            buttonPressed = true
-        }
-
-        while true { 
-            if changePattern {
-                // Reset the duty cycle after changing the pattern.
-                resetDutycycle()
-                changePattern = false
-            } else {
-                // Update duty cycle depending on the current LED pattern.
-                updateDutycycle()
-            }
-            
-            // Set the PWM with the given duty cycle to change LED brightness.
-            led.setDutycycle(dutycycle)
-            sleep(ms: loopDuration) 
-
-            // Update pattern index after button has been pressed and is released now.
-            if buttonPressed {
-                changePattern = true
-                patternIndex += 1
-                if patternIndex == LEDPattern.allCases.count { 
-                    patternIndex = 0
-                }
-
-                buttonPressed = false
-            }
-        }
-
-        // Reset the duty cycle for a new LED pattern.
-        func resetDutycycle() {
-            switch LEDPattern(rawValue: patternIndex)! {
-            case .off: 
-                dutycycle = minDutycycle
-            case .on: 
-                dutycycle = maxDutycycle
-            case .blink:  
-                dutycycle = maxDutycycle
-                blinkTime = 0
-            case .breathing: 
-                dutycycle = minDutycycle
-                stepDutycycle = abs(stepDutycycle)
-            }  
-        }
-        
-        // Update the duty cycle of the PWM signal according to the current LED pattern.
-        func updateDutycycle() {
-            switch LEDPattern(rawValue: patternIndex)! {
-            case .blink: 
-                // For the first half of blinkPeriod, turn on the LED.
-                // For the second half of blinkPeriod, turn off the LED.
-                // The duty cycle changes between 0.0 and 1.0 to turn on and off the LED in turn.
-                blinkTime += loopDuration
-                dutycycle = blinkTime % blinkPeriod < (blinkPeriod / 2) ? maxDutycycle : minDutycycle
-            case .breathing: 
-                // The duty cycle gradually increases to the maximum, then decrease to the mininum.
-                // Therefore, the LED brightens and dims in turn.
-                dutycycle += stepDutycycle
-            
-                // Check if LED brightness is increaed to the max or decreased to min. 
-                if stepDutycycle > 0 && dutycycle >= maxDutycycle {
-                    stepDutycycle.negate()
-                    dutycycle = maxDutycycle
-                } else if stepDutycycle < 0 && dutycycle <= minDutycycle {
-                    stepDutycycle.negate()
-                    dutycycle = minDutycycle
-                }
-            default: break
-            }
-        }
-
-        enum LEDPattern: Int, CaseIterable {
-            case off
-            case on
-            case blink
-            case breathing
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Sources/main.swift b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Sources/main.swift
new file mode 100644
index 0000000..789501a
--- /dev/null
+++ b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Sources/main.swift
@@ -0,0 +1,110 @@
+// Switch the LED pattern by pressing the button.
+// The LED patterns are: constant off, constant on, blink, breathing.
+
+import SwiftIO
+import MadBoard
+
+
+let led = PWMOut(Id.PWM4A)
+let button = DigitalIn(Id.D1)
+
+// Store the maximum and minimum values of the duty cycle to two constants. 
+let maxDutycycle: Float = 1.0
+let minDutycycle: Float = 0.0
+
+var dutycycle: Float = 0.0
+var stepDutycycle: Float = 0.01
+
+// The duration in ms of each loop.
+let loopDuration = 10
+// Make the LED on for 500ms and off for 500ms.
+let blinkPeriod = 1000
+var blinkTime = 0
+
+var patternIndex = 0
+var changePattern = false
+
+// Set the duty cycle depending on the pattern.
+resetDutycycle()
+
+var buttonPressed = false
+
+// If the button has been pressed and is released now, change to the next pattern.
+button.setInterrupt(.falling) {
+    buttonPressed = true
+}
+
+while true { 
+    if changePattern {
+        // Reset the duty cycle after changing the pattern.
+        resetDutycycle()
+        changePattern = false
+    } else {
+        // Update duty cycle depending on the current LED pattern.
+        updateDutycycle()
+    }
+    
+    // Set the PWM with the given duty cycle to change LED brightness.
+    led.setDutycycle(dutycycle)
+    sleep(ms: loopDuration) 
+
+    // Update pattern index after button has been pressed and is released now.
+    if buttonPressed {
+        changePattern = true
+        patternIndex += 1
+        if patternIndex == LEDPattern.allCases.count { 
+            patternIndex = 0
+        }
+
+        buttonPressed = false
+    }
+}
+
+// Reset the duty cycle for a new LED pattern.
+func resetDutycycle() {
+    switch LEDPattern(rawValue: patternIndex)! {
+    case .off: 
+        dutycycle = minDutycycle
+    case .on: 
+        dutycycle = maxDutycycle
+    case .blink:  
+        dutycycle = maxDutycycle
+        blinkTime = 0
+    case .breathing: 
+        dutycycle = minDutycycle
+        stepDutycycle = abs(stepDutycycle)
+    }  
+}
+
+// Update the duty cycle of the PWM signal according to the current LED pattern.
+func updateDutycycle() {
+    switch LEDPattern(rawValue: patternIndex)! {
+    case .blink: 
+        // For the first half of blinkPeriod, turn on the LED.
+        // For the second half of blinkPeriod, turn off the LED.
+        // The duty cycle changes between 0.0 and 1.0 to turn on and off the LED in turn.
+        blinkTime += loopDuration
+        dutycycle = blinkTime % blinkPeriod < (blinkPeriod / 2) ? maxDutycycle : minDutycycle
+    case .breathing: 
+        // The duty cycle gradually increases to the maximum, then decrease to the mininum.
+        // Therefore, the LED brightens and dims in turn.
+        dutycycle += stepDutycycle
+    
+        // Check if LED brightness is increaed to the max or decreased to min. 
+        if stepDutycycle > 0 && dutycycle >= maxDutycycle {
+            stepDutycycle.negate()
+            dutycycle = maxDutycycle
+        } else if stepDutycycle < 0 && dutycycle <= minDutycycle {
+            stepDutycycle.negate()
+            dutycycle = minDutycycle
+        }
+    default: break
+    }
+}
+
+enum LEDPattern: Int, CaseIterable {
+    case off
+    case on
+    case blink
+    case breathing
+}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Tests/LEDPatternChangeTests/LEDPatternChangeTests.swift b/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Tests/LEDPatternChangeTests/LEDPatternChangeTests.swift
deleted file mode 100644
index 21a2199..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/LEDPatternChange/Tests/LEDPatternChangeTests/LEDPatternChangeTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LEDPatternChange
-
-final class LEDPatternChangeTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LEDPatternChange().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/.gitignore b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/.gitignore
+++ b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Package.swift b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Package.swift
index ae05471..a872bbb 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Package.swift
+++ b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "PlayingScale",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "PlayingScale",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "PlayingScaleTests",
-            dependencies: ["PlayingScale"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/README.md b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/README.md
deleted file mode 100644
index a89694f..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# PlayingScale
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Sources/PlayingScale/PlayingScale.swift b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Sources/PlayingScale/PlayingScale.swift
deleted file mode 100644
index 8871c48..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Sources/PlayingScale/PlayingScale.swift
+++ /dev/null
@@ -1,29 +0,0 @@
-// Import the SwiftIO library to set the input and output, and the MadBoard to use the pin id.
-import SwiftIO
-import MadBoard
-
-@main
-public struct PlayingScale {
-    public static func main() {
-        // Initialize a PWM pin for the buzzer.
-        let buzzer = PWMOut(Id.PWM5A)
-
-        // Declare a constant to store an array of frequencies. 
-        // Consult the pitch-frequency chart above and list all the necessary frequencies in order in the array.
-        let frequencies = [262, 294, 330, 349, 392, 440, 494, 523]
-
-        // Use the for-in loop to iterate through each frequency.
-        // Set the frequency of the PWM signal to generate sounds. Each note will last 1s.
-        for frequency in frequencies {
-            buzzer.set(frequency: frequency, dutycycle: 0.5)
-            sleep(ms: 1000)
-        }
-
-        // Stop the buzzer sound.
-        buzzer.suspend()
-
-        while true {
-            sleep(ms: 1000)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Sources/main.swift b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Sources/main.swift
new file mode 100644
index 0000000..60a99b1
--- /dev/null
+++ b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Sources/main.swift
@@ -0,0 +1,25 @@
+// Import the SwiftIO library to set the input and output, and the MadBoard to use the pin id.
+import SwiftIO
+import MadBoard
+
+
+// Initialize a PWM pin for the buzzer.
+let buzzer = PWMOut(Id.PWM5A)
+
+// Declare a constant to store an array of frequencies. 
+// Consult the pitch-frequency chart above and list all the necessary frequencies in order in the array.
+let frequencies = [262, 294, 330, 349, 392, 440, 494, 523]
+
+// Use the for-in loop to iterate through each frequency.
+// Set the frequency of the PWM signal to generate sounds. Each note will last 1s.
+for frequency in frequencies {
+    buzzer.set(frequency: frequency, dutycycle: 0.5)
+    sleep(ms: 1000)
+}
+
+// Stop the buzzer sound.
+buzzer.suspend()
+
+while true {
+    sleep(ms: 1000)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Tests/PlayingScaleTests/PlayingScaleTests.swift b/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Tests/PlayingScaleTests/PlayingScaleTests.swift
deleted file mode 100644
index 71d0ef6..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/PlayingScale/Tests/PlayingScaleTests/PlayingScaleTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import PlayingScale
-
-final class PlayingScaleTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(PlayingScale().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/.gitignore b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/.gitignore
+++ b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Package.swift b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Package.swift
index c41d07e..c019f02 100644
--- a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Package.swift
+++ b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "ReflexGame",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "ReflexGame",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "ReflexGameTests",
-            dependencies: ["ReflexGame"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/README.md b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/README.md
deleted file mode 100644
index 74c6b71..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ReflexGame
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Sources/ReflexGame/ReflexGame.swift b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Sources/ReflexGame/ReflexGame.swift
deleted file mode 100644
index b645618..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Sources/ReflexGame/ReflexGame.swift
+++ /dev/null
@@ -1,48 +0,0 @@
-// Press the button D1 to start the game.
-// Once you see the red LED turns on, press the button D19 immediately.
-// Then the LED turns off and you can see your reflex time in serial monitor.
-// To restart the game, press button D1 again.
-
-import SwiftIO
-import MadBoard
-
-@main
-public struct ReflexGame {
-    public static func main() {
-        let startButton = DigitalIn(Id.D1)
-        let player = DigitalIn(Id.D19)
-        let buzzer = PWMOut(Id.PWM5A)
-        let led = DigitalOut(Id.D18)
-
-        while true {
-            // Press the start button to begin the game.
-            if startButton.read() {
-                // A beep as a notification.
-                buzzer.set(frequency: 500, dutycycle: 0.5)
-                sleep(ms: 500)
-                buzzer.suspend()
-
-                // Wait for several seconds before the game starts.
-                sleep(ms: 1000 * Int.random(in: 1...5))
-
-                // Turn on the red LED as a sign of start.
-                led.high()
-                // Store the current clock cycle.
-                let startClockCycle = getClockCycle()
-
-                // Wait until the button is pressed.
-                while !player.read() {
-                    sleep(ms: 1)
-                }
-
-                // Calculate the time in ns.
-                let duration = cyclesToNanoseconds(start: startClockCycle, stop: getClockCycle())
-                // Turn off the indicator.
-                led.low()
-                print("Reflex time: \(Float(duration) / 1000_000)ms")
-            }
-
-            sleep(ms: 10)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Sources/main.swift b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Sources/main.swift
new file mode 100644
index 0000000..fa979ed
--- /dev/null
+++ b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Sources/main.swift
@@ -0,0 +1,44 @@
+// Press the button D1 to start the game.
+// Once you see the red LED turns on, press the button D19 immediately.
+// Then the LED turns off and you can see your reflex time in serial monitor.
+// To restart the game, press button D1 again.
+
+import SwiftIO
+import MadBoard
+
+
+let startButton = DigitalIn(Id.D1)
+let player = DigitalIn(Id.D19)
+let buzzer = PWMOut(Id.PWM5A)
+let led = DigitalOut(Id.D18)
+
+while true {
+    // Press the start button to begin the game.
+    if startButton.read() {
+        // A beep as a notification.
+        buzzer.set(frequency: 500, dutycycle: 0.5)
+        sleep(ms: 500)
+        buzzer.suspend()
+
+        // Wait for several seconds before the game starts.
+        sleep(ms: 1000 * Int.random(in: 1...5))
+
+        // Turn on the red LED as a sign of start.
+        led.high()
+        // Store the current clock cycle.
+        let startClockCycle = getClockCycle()
+
+        // Wait until the button is pressed.
+        while !player.read() {
+            sleep(ms: 1)
+        }
+
+        // Calculate the time in ns.
+        let duration = cyclesToNanoseconds(start: startClockCycle, stop: getClockCycle())
+        // Turn off the indicator.
+        led.low()
+        print("Reflex time: \(Float(duration) / 1000_000)ms")
+    }
+
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Tests/ReflexGameTests/ReflexGameTests.swift b/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Tests/ReflexGameTests/ReflexGameTests.swift
deleted file mode 100644
index 9474ac4..0000000
--- a/Examples/SwiftIOPlayground/03Buzzer/ReflexGame/Tests/ReflexGameTests/ReflexGameTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import ReflexGame
-
-final class ReflexGameTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(ReflexGame().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/.gitignore b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/.gitignore
+++ b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Package.swift b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Package.swift
index e167eca..de3f1dd 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Package.swift
+++ b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "DoubleLEDDimmer",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "DoubleLEDDimmer",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "DoubleLEDDimmerTests",
-            dependencies: ["DoubleLEDDimmer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/README.md b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/README.md
deleted file mode 100644
index a10fb96..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# DoubleLEDDimmer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Sources/DoubleLEDDimmer/DoubleLEDDimmer.swift b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Sources/DoubleLEDDimmer/DoubleLEDDimmer.swift
deleted file mode 100644
index bdb03aa..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Sources/DoubleLEDDimmer/DoubleLEDDimmer.swift
+++ /dev/null
@@ -1,38 +0,0 @@
-// In this project, two potentiometers control the LED brightness.
-// One controls the maximum intensity and the other adjusts the brightness between the minimum and the maximum.
-
-// Import SwiftIO to control input and output.
-import SwiftIO
-// Import MadBoard to use the pin ids.
-import MadBoard
-
-@main
-public struct DoubleLEDDimmer {
-    public static func main() {
-        // Initialize the analog pin used to adjust LED brightness from min and max.
-        let brightnessPot = AnalogIn(Id.A0)
-        // Initialize the analog pin used to set max brightness. 
-        let intensityPot = AnalogIn(Id.A11)
-        // Initialize the PWM pin for the LED.
-        let led = PWMOut(Id.PWM4A)
-
-        // Define the available range of max duty cycle adjusted by A11. 
-        let minIntensity: Float = 0.2
-        let maxIntensity: Float = 1
-
-        while true {
-            // Map the analog value from the range 0-1 to the range minIntensity-maxIntensity. 
-            // It decides the max duty cycle for the PWM signal.
-            // That's to say, it changes the maximum intensity of the LED.
-            let maxDutycycle = intensityPot.readPercent() * (maxIntensity - minIntensity) + minIntensity
-
-            // Read the analog value (0-1) from the pin A0 which serves as ratio for final duty cycle.
-            let dutycycleRatio = brightnessPot.readPercent()
-
-            // Calculate the final duty cycle value (0-maxDutycycle).
-            // Set the PWM output using the result.
-            led.setDutycycle(dutycycleRatio * maxDutycycle)
-            sleep(ms: 20)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Sources/main.swift b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Sources/main.swift
new file mode 100644
index 0000000..d325361
--- /dev/null
+++ b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Sources/main.swift
@@ -0,0 +1,34 @@
+// In this project, two potentiometers control the LED brightness.
+// One controls the maximum intensity and the other adjusts the brightness between the minimum and the maximum.
+
+// Import SwiftIO to control input and output.
+import SwiftIO
+// Import MadBoard to use the pin ids.
+import MadBoard
+
+
+// Initialize the analog pin used to adjust LED brightness from min and max.
+let brightnessPot = AnalogIn(Id.A0)
+// Initialize the analog pin used to set max brightness. 
+let intensityPot = AnalogIn(Id.A11)
+// Initialize the PWM pin for the LED.
+let led = PWMOut(Id.PWM4A)
+
+// Define the available range of max duty cycle adjusted by A11. 
+let minIntensity: Float = 0.2
+let maxIntensity: Float = 1
+
+while true {
+    // Map the analog value from the range 0-1 to the range minIntensity-maxIntensity. 
+    // It decides the max duty cycle for the PWM signal.
+    // That's to say, it changes the maximum intensity of the LED.
+    let maxDutycycle = intensityPot.readPercent() * (maxIntensity - minIntensity) + minIntensity
+
+    // Read the analog value (0-1) from the pin A0 which serves as ratio for final duty cycle.
+    let dutycycleRatio = brightnessPot.readPercent()
+
+    // Calculate the final duty cycle value (0-maxDutycycle).
+    // Set the PWM output using the result.
+    led.setDutycycle(dutycycleRatio * maxDutycycle)
+    sleep(ms: 20)
+}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Tests/DoubleLEDDimmerTests/DoubleLEDDimmerTests.swift b/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Tests/DoubleLEDDimmerTests/DoubleLEDDimmerTests.swift
deleted file mode 100644
index d18c788..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/DoubleLEDDimmer/Tests/DoubleLEDDimmerTests/DoubleLEDDimmerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import DoubleLEDDimmer
-
-final class DoubleLEDDimmerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(DoubleLEDDimmer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/.gitignore b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/.gitignore
+++ b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Package.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Package.swift
index 6bd5e7c..c8f3438 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Package.swift
+++ b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LEDBlinkControl",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LEDBlinkControl",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDBlinkControlTests",
-            dependencies: ["LEDBlinkControl"]),
     ]
-)
+)
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/README.md b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/README.md
deleted file mode 100644
index d8ca78a..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LEDBlinkControl
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Sources/LEDBlinkControl/LEDBlinkControl.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Sources/LEDBlinkControl/LEDBlinkControl.swift
deleted file mode 100644
index 422c5a4..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Sources/LEDBlinkControl/LEDBlinkControl.swift
+++ /dev/null
@@ -1,33 +0,0 @@
-// Use two potentiometers to control LED.
-// One changes LED brightness and the other changes the blink rate.
-
-// Import SwiftIO to control input and output.
-import SwiftIO
-// Import MadBoard to use the pin ids.
-import MadBoard
-
-@main
-public struct LEDBlinkControl {
-    public static func main() {
-        // Initialize the analog pin used to adjust LED brightness.
-        let brightnessPot = AnalogIn(Id.A0)
-        // Initialize the analog pin used to change blink rate. 
-        let blinkRatePot = AnalogIn(Id.A11)
-        // Initialize the PWM pin for the LED.
-        let led = PWMOut(Id.PWM4A)
-
-        while true {
-            // Read raw value from the analog pin. It sets the LED blink rate.
-            let blinkTime = blinkRatePot.readRawValue() / 2
-
-            // Read value from the analog pin. 
-            // It serves as duty cycle for PWM to set LED brightness.
-            led.setDutycycle(brightnessPot.readPercent())
-            sleep(ms: blinkTime)
-
-            // After a specified time, suspend the output to turn off the LED.
-            led.suspend()
-            sleep(ms: blinkTime)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Sources/main.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Sources/main.swift
new file mode 100644
index 0000000..2ae34a8
--- /dev/null
+++ b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Sources/main.swift
@@ -0,0 +1,29 @@
+// Use two potentiometers to control LED.
+// One changes LED brightness and the other changes the blink rate.
+
+// Import SwiftIO to control input and output.
+import SwiftIO
+// Import MadBoard to use the pin ids.
+import MadBoard
+
+
+// Initialize the analog pin used to adjust LED brightness.
+let brightnessPot = AnalogIn(Id.A0)
+// Initialize the analog pin used to change blink rate. 
+let blinkRatePot = AnalogIn(Id.A11)
+// Initialize the PWM pin for the LED.
+let led = PWMOut(Id.PWM4A)
+
+while true {
+    // Read raw value from the analog pin. It sets the LED blink rate.
+    let blinkTime = blinkRatePot.readRawValue() / 2
+
+    // Read value from the analog pin. 
+    // It serves as duty cycle for PWM to set LED brightness.
+    led.setDutycycle(brightnessPot.readPercent())
+    sleep(ms: blinkTime)
+
+    // After a specified time, suspend the output to turn off the LED.
+    led.suspend()
+    sleep(ms: blinkTime)
+}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Tests/LEDBlinkControlTests/LEDBlinkControlTests.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Tests/LEDBlinkControlTests/LEDBlinkControlTests.swift
deleted file mode 100644
index 51b49ac..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDBlinkControl/Tests/LEDBlinkControlTests/LEDBlinkControlTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LEDBlinkControl
-
-final class LEDBlinkControlTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LEDBlinkControl().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/.gitignore b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/.gitignore
+++ b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Package.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Package.swift
index 401ebfb..8479553 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Package.swift
+++ b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LEDDimmer",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LEDDimmer",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDDimmerTests",
-            dependencies: ["LEDDimmer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/README.md b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/README.md
deleted file mode 100644
index 8de6bbd..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LEDDimmer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Sources/LEDDimmer/LEDDimmer.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Sources/LEDDimmer/LEDDimmer.swift
deleted file mode 100644
index 7462289..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Sources/LEDDimmer/LEDDimmer.swift
+++ /dev/null
@@ -1,22 +0,0 @@
-// Import SwiftIO library to control input and output, and MadBoard to use the pin name.
-import SwiftIO
-import MadBoard
-
-@main
-public struct LEDDimmer {
-    public static func main() {
-        // Initialize the analog pin for the potentiometer and PWM pin for the LED.
-        let pot = AnalogIn(Id.A0)
-        let led = PWMOut(Id.PWM4A)
-
-        // Read the input value. 
-        // The value is represented in percentage, while the duty cycle is also between 0 and 1, 
-        // so you can directly use the reading value to set the PWM.
-        while true {
-            let dutycycle = pot.readPercent()
-            led.setDutycycle(dutycycle)
-
-            sleep(ms: 20)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Sources/main.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Sources/main.swift
new file mode 100644
index 0000000..93b4e29
--- /dev/null
+++ b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Sources/main.swift
@@ -0,0 +1,18 @@
+// Import SwiftIO library to control input and output, and MadBoard to use the pin name.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the analog pin for the potentiometer and PWM pin for the LED.
+let pot = AnalogIn(Id.A0)
+let led = PWMOut(Id.PWM4A)
+
+// Read the input value. 
+// The value is represented in percentage, while the duty cycle is also between 0 and 1, 
+// so you can directly use the reading value to set the PWM.
+while true {
+    let dutycycle = pot.readPercent()
+    led.setDutycycle(dutycycle)
+
+    sleep(ms: 20)
+}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Tests/LEDDimmerTests/LEDDimmerTests.swift b/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Tests/LEDDimmerTests/LEDDimmerTests.swift
deleted file mode 100644
index beff2c7..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/LEDDimmer/Tests/LEDDimmerTests/LEDDimmerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LEDDimmer
-
-final class LEDDimmerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LEDDimmer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/.gitignore b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/.gitignore
+++ b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Package.swift b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Package.swift
index d526bb1..2d4d390 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Package.swift
+++ b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "PitchControl",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "PitchControl",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "PitchControlTests",
-            dependencies: ["PitchControl"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/README.md b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/README.md
deleted file mode 100644
index e156536..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# PitchControl
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Sources/PitchControl/PitchControl.swift b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Sources/PitchControl/PitchControl.swift
deleted file mode 100644
index 0212947..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Sources/PitchControl/PitchControl.swift
+++ /dev/null
@@ -1,22 +0,0 @@
-// Import the SwiftIO to control input and output and the MadBoard to use the pin name.
-import SwiftIO
-import MadBoard
-
-@main
-public struct PitchControl {
-    public static func main() {
-        // Initialize the analog pin for the potentiometer and PWM pin for the LED.
-        let pot = AnalogIn(Id.A0)
-        let buzzer = PWMOut(Id.PWM5A)
-
-        // Read the input value in percentage. 
-        // Then calculate the value into the frequency. 
-        // Set the PWM with the frequency and a duty cycle.
-        while true {
-            let potPercentage = pot.readPercent()
-            let frequency = 50 + Int(1000 * potPercentage)
-            buzzer.set(frequency: frequency, dutycycle: 0.5)
-            sleep(ms: 20)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Sources/main.swift b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Sources/main.swift
new file mode 100644
index 0000000..05ea75a
--- /dev/null
+++ b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Sources/main.swift
@@ -0,0 +1,18 @@
+// Import the SwiftIO to control input and output and the MadBoard to use the pin name.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the analog pin for the potentiometer and PWM pin for the LED.
+let pot = AnalogIn(Id.A0)
+let buzzer = PWMOut(Id.PWM5A)
+
+// Read the input value in percentage. 
+// Then calculate the value into the frequency. 
+// Set the PWM with the frequency and a duty cycle.
+while true {
+    let potPercentage = pot.readPercent()
+    let frequency = 50 + Int(1000 * potPercentage)
+    buzzer.set(frequency: frequency, dutycycle: 0.5)
+    sleep(ms: 20)
+}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Tests/PitchControlTests/PitchControlTests.swift b/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Tests/PitchControlTests/PitchControlTests.swift
deleted file mode 100644
index 14395ed..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/PitchControl/Tests/PitchControlTests/PitchControlTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import PitchControl
-
-final class PitchControlTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(PitchControl().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/.gitignore b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/.gitignore
+++ b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Package.swift b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Package.swift
index 4b79891..45b740d 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Package.swift
+++ b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "PlayingTones",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "PlayingTones",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "PlayingTonesTests",
-            dependencies: ["PlayingTones"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/README.md b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/README.md
deleted file mode 100644
index 337683b..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# PlayingTones
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Sources/PlayingTones/PlayingTones.swift b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Sources/PlayingTones/PlayingTones.swift
deleted file mode 100644
index 8ecb375..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Sources/PlayingTones/PlayingTones.swift
+++ /dev/null
@@ -1,38 +0,0 @@
-// Play scales by rotating a potentiometer slowly.
-
-// Import the SwiftIO library to set the input and output, and the MadBoard to use the pin ids.
-import SwiftIO
-import MadBoard
-
-@main
-public struct PlayingTones {
-    public static func main() {
-        // Initialize a PWM pin for the buzzer.
-        let buzzer = PWMOut(Id.PWM5A)
-        // Initialize a analog pin for the potentiometer.
-        let pot = AnalogIn(Id.A0)
-
-        // Declare a constant to store an array of frequencies. 
-        // They matches respectively notes C4, D4, E4, F4, G4, A4, B4, C5.
-        let frequencies = [262, 294, 330, 349, 392, 440, 494, 523]
-
-        // Store the last frequency index to avoid playing the same note.
-        var lastFrequencyIndex = frequencies.count
-
-        while true {
-            // Read the raw analog value from the pin.
-            // Map the value into the index of the array.
-            let frequencyIndex = Int((Float(pot.readRawValue() * (frequencies.count - 1)) / Float(pot.maxRawValue)).rounded(.toNearestOrAwayFromZero))
-
-            // Check if the note hasn't been played.
-            if frequencyIndex != lastFrequencyIndex {
-                // Play the new note for 500ms.
-                buzzer.set(frequency: frequencies[frequencyIndex], dutycycle: 0.5)
-                sleep(ms: 500)
-                buzzer.suspend()
-                lastFrequencyIndex = frequencyIndex
-            }
-            sleep(ms: 10)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Sources/main.swift b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Sources/main.swift
new file mode 100644
index 0000000..0da39a1
--- /dev/null
+++ b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Sources/main.swift
@@ -0,0 +1,34 @@
+// Play scales by rotating a potentiometer slowly.
+
+// Import the SwiftIO library to set the input and output, and the MadBoard to use the pin ids.
+import SwiftIO
+import MadBoard
+
+
+// Initialize a PWM pin for the buzzer.
+let buzzer = PWMOut(Id.PWM5A)
+// Initialize a analog pin for the potentiometer.
+let pot = AnalogIn(Id.A0)
+
+// Declare a constant to store an array of frequencies. 
+// They matches respectively notes C4, D4, E4, F4, G4, A4, B4, C5.
+let frequencies = [262, 294, 330, 349, 392, 440, 494, 523]
+
+// Store the last frequency index to avoid playing the same note.
+var lastFrequencyIndex = frequencies.count
+
+while true {
+    // Read the raw analog value from the pin.
+    // Map the value into the index of the array.
+    let frequencyIndex = Int((Float(pot.readRawValue() * (frequencies.count - 1)) / Float(pot.maxRawValue)).rounded(.toNearestOrAwayFromZero))
+
+    // Check if the note hasn't been played.
+    if frequencyIndex != lastFrequencyIndex {
+        // Play the new note for 500ms.
+        buzzer.set(frequency: frequencies[frequencyIndex], dutycycle: 0.5)
+        sleep(ms: 500)
+        buzzer.suspend()
+        lastFrequencyIndex = frequencyIndex
+    }
+    sleep(ms: 10)
+}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Tests/PlayingTonesTests/PlayingTonesTests.swift b/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Tests/PlayingTonesTests/PlayingTonesTests.swift
deleted file mode 100644
index 219fd99..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/PlayingTones/Tests/PlayingTonesTests/PlayingTonesTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import PlayingTones
-
-final class PlayingTonesTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(PlayingTones().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/.gitignore b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/.gitignore
+++ b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Package.swift b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Package.swift
index 0e13bff..700faa1 100644
--- a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Package.swift
+++ b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Potentiometer",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Potentiometer",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "PotentiometerTests",
-            dependencies: ["Potentiometer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/README.md b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/README.md
deleted file mode 100644
index b15a34e..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Potentiometer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Sources/Potentiometer/Potentiometer.swift b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Sources/Potentiometer/Potentiometer.swift
deleted file mode 100644
index 4280d9e..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Sources/Potentiometer/Potentiometer.swift
+++ /dev/null
@@ -1,18 +0,0 @@
-// Import SwiftIO library to control input and output, and MadBoard to use the pin name.
-import SwiftIO
-import MadBoard
-
-@main
-public struct Potentiometer {
-    public static func main() {
-        // Initialize the analog pin A0 for the potentiometer.
-        let pot = AnalogIn(Id.A0)
-
-        // Read the voltage value and print it out every second.
-        while true {
-            let potVoltage = pot.readVoltage()
-            print(potVoltage)
-            sleep(ms: 1000)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Sources/main.swift b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Sources/main.swift
new file mode 100644
index 0000000..7469592
--- /dev/null
+++ b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Sources/main.swift
@@ -0,0 +1,14 @@
+// Import SwiftIO library to control input and output, and MadBoard to use the pin name.
+import SwiftIO
+import MadBoard
+
+
+// Initialize the analog pin A0 for the potentiometer.
+let pot = AnalogIn(Id.A0)
+
+// Read the voltage value and print it out every second.
+while true {
+    let potVoltage = pot.readVoltage()
+    print(potVoltage)
+    sleep(ms: 1000)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Tests/PotentiometerTests/PotentiometerTests.swift b/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Tests/PotentiometerTests/PotentiometerTests.swift
deleted file mode 100644
index 881417e..0000000
--- a/Examples/SwiftIOPlayground/04Potentiometer/Potentiometer/Tests/PotentiometerTests/PotentiometerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Potentiometer
-
-final class PotentiometerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Potentiometer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/.gitignore b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/.gitignore
+++ b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Package.swift b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Package.swift
index c1f7a9e..f4c6740 100644
--- a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Package.swift
+++ b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "AverageTemperature",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "AverageTemperature",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "SHT3x", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "SHT3x", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AverageTemperatureTests",
-            dependencies: ["AverageTemperature"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/README.md b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/README.md
deleted file mode 100644
index d8320b9..0000000
--- a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# AverageTemperature
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Sources/AverageTemperature/AverageTemperature.swift b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Sources/AverageTemperature/AverageTemperature.swift
deleted file mode 100644
index 70b48af..0000000
--- a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Sources/AverageTemperature/AverageTemperature.swift
+++ /dev/null
@@ -1,51 +0,0 @@
-// Measure the temperature and get an average reading after a button press.
-
-// Import SwiftIO to use I2C communication and MadBoard to use pin id. 
-import SwiftIO
-import MadBoard
-// Import SHT3x to use its functionalities to read values. 
-import SHT3x
-
-@main
-public struct AverageTemperature {
-    public static func main() {
-        // Initialize the I2C interface and use it to initialize the sensor.
-        let i2c = I2C(Id.I2C0)
-        let humiture = SHT3x(i2c)
-
-        // Initialize the LED indicator pin.
-        let led = DigitalOut(Id.D18)
-        // Initialize the button pin.
-        let button = DigitalIn(Id.D1)
-
-        // Decide if it's time to read temperature.
-        var startMeasurement = false
-
-        while true {
-            // If button is pressed, update the state.
-            if button.read() {
-                startMeasurement = true
-            }
-
-            // If the button has been pressed and is released, time to measure the temperature.
-            if startMeasurement && !button.read() {
-                // Turn on the LED as an indicator.
-                led.high()
-                // Read the value 20 times to calculate the average.
-                var sum: Float = 0
-                for _ in 0..<20 {
-                    sum += humiture.readCelsius()
-                    sleep(ms: 3)
-                }
-
-                // Print the average temperature in celsius.
-                print("Temperature: \(sum / 20.0)C")
-                startMeasurement = false
-                // Turn off the indicator.
-                led.low()
-            }
-
-            sleep(ms: 20)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Sources/main.swift b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Sources/main.swift
new file mode 100644
index 0000000..3a75bc2
--- /dev/null
+++ b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Sources/main.swift
@@ -0,0 +1,47 @@
+// Measure the temperature and get an average reading after a button press.
+
+// Import SwiftIO to use I2C communication and MadBoard to use pin id. 
+import SwiftIO
+import MadBoard
+// Import SHT3x to use its functionalities to read values. 
+import SHT3x
+
+
+// Initialize the I2C interface and use it to initialize the sensor.
+let i2c = I2C(Id.I2C0)
+let humiture = SHT3x(i2c)
+
+// Initialize the LED indicator pin.
+let led = DigitalOut(Id.D18)
+// Initialize the button pin.
+let button = DigitalIn(Id.D1)
+
+// Decide if it's time to read temperature.
+var startMeasurement = false
+
+while true {
+    // If button is pressed, update the state.
+    if button.read() {
+        startMeasurement = true
+    }
+
+    // If the button has been pressed and is released, time to measure the temperature.
+    if startMeasurement && !button.read() {
+        // Turn on the LED as an indicator.
+        led.high()
+        // Read the value 20 times to calculate the average.
+        var sum: Float = 0
+        for _ in 0..<20 {
+            sum += humiture.readCelsius()
+            sleep(ms: 3)
+        }
+
+        // Print the average temperature in celsius.
+        print("Temperature: \(sum / 20.0)C")
+        startMeasurement = false
+        // Turn off the indicator.
+        led.low()
+    }
+
+    sleep(ms: 20)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Tests/AverageTemperatureTests/AverageTemperatureTests.swift b/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Tests/AverageTemperatureTests/AverageTemperatureTests.swift
deleted file mode 100644
index 7615317..0000000
--- a/Examples/SwiftIOPlayground/05Humiture/AverageTemperature/Tests/AverageTemperatureTests/AverageTemperatureTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import AverageTemperature
-
-final class AverageTemperatureTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(AverageTemperature().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/05Humiture/Humiture/.gitignore b/Examples/SwiftIOPlayground/05Humiture/Humiture/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/05Humiture/Humiture/.gitignore
+++ b/Examples/SwiftIOPlayground/05Humiture/Humiture/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/05Humiture/Humiture/Package.swift b/Examples/SwiftIOPlayground/05Humiture/Humiture/Package.swift
index 3a8c03a..8663e8c 100644
--- a/Examples/SwiftIOPlayground/05Humiture/Humiture/Package.swift
+++ b/Examples/SwiftIOPlayground/05Humiture/Humiture/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Humiture",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Humiture",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "SHT3x", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "SHT3x", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "HumitureTests",
-            dependencies: ["Humiture"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/05Humiture/Humiture/README.md b/Examples/SwiftIOPlayground/05Humiture/Humiture/README.md
deleted file mode 100644
index da77407..0000000
--- a/Examples/SwiftIOPlayground/05Humiture/Humiture/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Humiture
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/05Humiture/Humiture/Sources/Humiture/Humiture.swift b/Examples/SwiftIOPlayground/05Humiture/Humiture/Sources/Humiture/Humiture.swift
deleted file mode 100644
index 1459c58..0000000
--- a/Examples/SwiftIOPlayground/05Humiture/Humiture/Sources/Humiture/Humiture.swift
+++ /dev/null
@@ -1,24 +0,0 @@
-// Import SwiftIO to use I2C communication and MadBoard to use pin id. 
-import SwiftIO
-import MadBoard
-// Import SHT3x to use its functionalities to read values. 
-import SHT3x
-
-@main
-public struct Humiture {
-    public static func main() {
-        // Initialize the I2C interface and use it to initialize the sensor.
-        let i2c = I2C(Id.I2C0)
-        let humiture = SHT3x(i2c)
-
-        // Read the temperature and humidity and print their values out. 
-        // Stop for 1s and repeat it.
-        while true {
-            let temp = humiture.readCelsius()
-            let humidity = humiture.readHumidity()
-            print("Temperature: \(temp)C")
-            print("Humidity: \(humidity)%")
-            sleep(ms: 1000)
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/05Humiture/Humiture/Sources/main.swift b/Examples/SwiftIOPlayground/05Humiture/Humiture/Sources/main.swift
new file mode 100644
index 0000000..723be6c
--- /dev/null
+++ b/Examples/SwiftIOPlayground/05Humiture/Humiture/Sources/main.swift
@@ -0,0 +1,20 @@
+// Import SwiftIO to use I2C communication and MadBoard to use pin id. 
+import SwiftIO
+import MadBoard
+// Import SHT3x to use its functionalities to read values. 
+import SHT3x
+
+
+// Initialize the I2C interface and use it to initialize the sensor.
+let i2c = I2C(Id.I2C0)
+let humiture = SHT3x(i2c)
+
+// Read the temperature and humidity and print their values out. 
+// Stop for 1s and repeat it.
+while true {
+    let temp = humiture.readCelsius()
+    let humidity = humiture.readHumidity()
+    print("Temperature: \(temp)C")
+    print("Humidity: \(humidity)%")
+    sleep(ms: 1000)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/05Humiture/Humiture/Tests/HumitureTests/HumitureTests.swift b/Examples/SwiftIOPlayground/05Humiture/Humiture/Tests/HumitureTests/HumitureTests.swift
deleted file mode 100644
index 489bb5a..0000000
--- a/Examples/SwiftIOPlayground/05Humiture/Humiture/Tests/HumitureTests/HumitureTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Humiture
-
-final class HumitureTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Humiture().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/06RTC/Alarm/.gitignore b/Examples/SwiftIOPlayground/06RTC/Alarm/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/06RTC/Alarm/.gitignore
+++ b/Examples/SwiftIOPlayground/06RTC/Alarm/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/06RTC/Alarm/Package.swift b/Examples/SwiftIOPlayground/06RTC/Alarm/Package.swift
index 2b2c72d..46cd9c0 100644
--- a/Examples/SwiftIOPlayground/06RTC/Alarm/Package.swift
+++ b/Examples/SwiftIOPlayground/06RTC/Alarm/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Alarm",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Alarm",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "PCF8563", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "PCF8563", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AlarmTests",
-            dependencies: ["Alarm"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/06RTC/Alarm/README.md b/Examples/SwiftIOPlayground/06RTC/Alarm/README.md
deleted file mode 100644
index fca6efb..0000000
--- a/Examples/SwiftIOPlayground/06RTC/Alarm/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Alarm
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/06RTC/Alarm/Sources/Alarm/Alarm.swift b/Examples/SwiftIOPlayground/06RTC/Alarm/Sources/Alarm/Alarm.swift
deleted file mode 100644
index 6cd1d39..0000000
--- a/Examples/SwiftIOPlayground/06RTC/Alarm/Sources/Alarm/Alarm.swift
+++ /dev/null
@@ -1,75 +0,0 @@
-// Set an alarm. It will go off at the specified time.
-// You can press the button to stop the sound.
-
-import SwiftIO
-import MadBoard
-import PCF8563
-
-@main
-public struct Alarm {
-    public static func main() {
-        let i2c = I2C(Id.I2C0)
-        let rtc = PCF8563(i2c)
-
-        let led = DigitalOut(Id.D18)
-        let buzzer = PWMOut(Id.PWM5A)
-
-        // Stop the alarm after it goes off.
-        let stopButton = DigitalIn(Id.D1)
-
-        // Set the alarm time.
-        let alarm = AlarmTime(hour: 10, minute: 40)
-        // Calculate the time when the alarm will stop sounding.
-        let stopAlarm = getStopAlarm(alarm, after: 1)
-        var isAlarmed = false
-
-        while true {
-            let time = rtc.readTime()
-
-            if isAlarmed {
-                // After the alarm clock goes off, 
-                // if it's time to stop sounding or you press the stop button,
-                // stop the sound and turn off the LED.
-                if stopAlarm.isTimeUp(time) || stopButton.read() {
-                    print("Current time: \(time)")
-                    led.low()
-                    buzzer.suspend()
-                    isAlarmed = false
-                }
-            } else {
-                // If the time comes, start the sound and turn on the LED.
-                if alarm.isTimeUp(time) {
-                    print("Current time: \(time)")
-                    led.high()
-                    buzzer.set(frequency: 500, dutycycle: 0.5)
-                    isAlarmed = true
-                }
-            }
-
-            sleep(ms: 10)
-        }
-
-        // Calculate the time for alarm to stop sounding after specified minutes.
-        func getStopAlarm(_ alarm: AlarmTime, after min: Int) -> AlarmTime {
-            var stopMinute = alarm.minute + min
-            var stopHour = alarm.hour
-
-            if stopMinute >= 60 {
-                stopMinute -= 60
-                stopHour = stopHour == 23 ? 0 : stopHour + 1
-            }
-
-            return AlarmTime(hour: stopHour, minute: stopMinute)
-        }
-
-        struct AlarmTime {
-            let hour: Int
-            let minute: Int
-
-            // Check if the set time comes.
-            func isTimeUp(_ time: PCF8563.Time) -> Bool {
-                return time.hour == hour && time.minute == minute && time.second == 0
-            }
-        }
-    }
-}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/06RTC/Alarm/Sources/main.swift b/Examples/SwiftIOPlayground/06RTC/Alarm/Sources/main.swift
new file mode 100644
index 0000000..33cdb74
--- /dev/null
+++ b/Examples/SwiftIOPlayground/06RTC/Alarm/Sources/main.swift
@@ -0,0 +1,71 @@
+// Set an alarm. It will go off at the specified time.
+// You can press the button to stop the sound.
+
+import SwiftIO
+import MadBoard
+import PCF8563
+
+
+let i2c = I2C(Id.I2C0)
+let rtc = PCF8563(i2c)
+
+let led = DigitalOut(Id.D18)
+let buzzer = PWMOut(Id.PWM5A)
+
+// Stop the alarm after it goes off.
+let stopButton = DigitalIn(Id.D1)
+
+// Set the alarm time.
+let alarm = AlarmTime(hour: 10, minute: 40)
+// Calculate the time when the alarm will stop sounding.
+let stopAlarm = getStopAlarm(alarm, after: 1)
+var isAlarmed = false
+
+while true {
+    let time = rtc.readTime()
+
+    if isAlarmed {
+        // After the alarm clock goes off, 
+        // if it's time to stop sounding or you press the stop button,
+        // stop the sound and turn off the LED.
+        if stopAlarm.isTimeUp(time) || stopButton.read() {
+            print("Current time: \(time)")
+            led.low()
+            buzzer.suspend()
+            isAlarmed = false
+        }
+    } else {
+        // If the time comes, start the sound and turn on the LED.
+        if alarm.isTimeUp(time) {
+            print("Current time: \(time)")
+            led.high()
+            buzzer.set(frequency: 500, dutycycle: 0.5)
+            isAlarmed = true
+        }
+    }
+
+    sleep(ms: 10)
+}
+
+// Calculate the time for alarm to stop sounding after specified minutes.
+func getStopAlarm(_ alarm: AlarmTime, after min: Int) -> AlarmTime {
+    var stopMinute = alarm.minute + min
+    var stopHour = alarm.hour
+
+    if stopMinute >= 60 {
+        stopMinute -= 60
+        stopHour = stopHour == 23 ? 0 : stopHour + 1
+    }
+
+    return AlarmTime(hour: stopHour, minute: stopMinute)
+}
+
+struct AlarmTime {
+    let hour: Int
+    let minute: Int
+
+    // Check if the set time comes.
+    func isTimeUp(_ time: PCF8563.Time) -> Bool {
+        return time.hour == hour && time.minute == minute && time.second == 0
+    }
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/06RTC/Alarm/Tests/AlarmTests/AlarmTests.swift b/Examples/SwiftIOPlayground/06RTC/Alarm/Tests/AlarmTests/AlarmTests.swift
deleted file mode 100644
index aeaaa0c..0000000
--- a/Examples/SwiftIOPlayground/06RTC/Alarm/Tests/AlarmTests/AlarmTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Alarm
-
-final class AlarmTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Alarm().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/.gitignore b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/.gitignore
+++ b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Package.swift b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Package.swift
index 8830336..0fa94ee 100644
--- a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Package.swift
+++ b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "BlinkUsingRTC",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "BlinkUsingRTC",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
                 .product(name: "PCF8563", package: "MadDrivers")
             ]),
-        .testTarget(
-            name: "BlinkUsingRTCTests",
-            dependencies: ["BlinkUsingRTC"]),
     ]
-)
+)
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/README.md b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/README.md
deleted file mode 100644
index 34da0a9..0000000
--- a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# BlinkUsingRTC
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Sources/BlinkUsingRTC/BlinkUsingRTC.swift b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Sources/BlinkUsingRTC/BlinkUsingRTC.swift
deleted file mode 100644
index 08996d4..0000000
--- a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Sources/BlinkUsingRTC/BlinkUsingRTC.swift
+++ /dev/null
@@ -1,20 +0,0 @@
-// Blink LED every second.
-
-import SwiftIO
-import MadBoard
-import PCF8563
-
-@main
-public struct BlinkUsingRTC {
-    public static func main() {
-        let i2c = I2C(Id.I2C0)
-        let rtc = PCF8563(i2c)
-        let led = DigitalOut(Id.D18)
-
-        while true {
-            let time = rtc.readTime()
-            led.write(time.second % 2 == 0)
-            sleep(ms: 10)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Sources/main.swift b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Sources/main.swift
new file mode 100644
index 0000000..7a241d8
--- /dev/null
+++ b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Sources/main.swift
@@ -0,0 +1,16 @@
+// Blink LED every second.
+
+import SwiftIO
+import MadBoard
+import PCF8563
+
+
+let i2c = I2C(Id.I2C0)
+let rtc = PCF8563(i2c)
+let led = DigitalOut(Id.D18)
+
+while true {
+    let time = rtc.readTime()
+    led.write(time.second % 2 == 0)
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Tests/BlinkUsingRTCTests/BlinkUsingRTCTests.swift b/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Tests/BlinkUsingRTCTests/BlinkUsingRTCTests.swift
deleted file mode 100644
index bd0c894..0000000
--- a/Examples/SwiftIOPlayground/06RTC/BlinkUsingRTC/Tests/BlinkUsingRTCTests/BlinkUsingRTCTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import BlinkUsingRTC
-
-final class BlinkUsingRTCTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(BlinkUsingRTC().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/06RTC/ReadingTime/.gitignore b/Examples/SwiftIOPlayground/06RTC/ReadingTime/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/06RTC/ReadingTime/.gitignore
+++ b/Examples/SwiftIOPlayground/06RTC/ReadingTime/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Package.swift b/Examples/SwiftIOPlayground/06RTC/ReadingTime/Package.swift
index d4049e7..20c6525 100644
--- a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Package.swift
+++ b/Examples/SwiftIOPlayground/06RTC/ReadingTime/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "ReadingTime",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "ReadingTime",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "PCF8563", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "PCF8563", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "ReadingTimeTests",
-            dependencies: ["ReadingTime"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/06RTC/ReadingTime/README.md b/Examples/SwiftIOPlayground/06RTC/ReadingTime/README.md
deleted file mode 100644
index c39da3e..0000000
--- a/Examples/SwiftIOPlayground/06RTC/ReadingTime/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ReadingTime
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Sources/ReadingTime/ReadingTime.swift b/Examples/SwiftIOPlayground/06RTC/ReadingTime/Sources/ReadingTime/ReadingTime.swift
deleted file mode 100644
index 7be8150..0000000
--- a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Sources/ReadingTime/ReadingTime.swift
+++ /dev/null
@@ -1,52 +0,0 @@
-// Read current time from the RTC and print it every second.
-
-import SwiftIO
-import MadBoard
-import PCF8563
-
-@main
-public struct ReadingTime {
-    public static func main() {
-        let i2c = I2C(Id.I2C0)
-        let rtc = PCF8563(i2c)
-
-        let daysOfWeek = [
-            "Monday", "Tuesday", "Wednesday",
-            "Thursday", "Friday", "Saturday",
-            "Sunday"
-        ]
-
-        // Please use current time to adjust the RTC time if it has been lost power.
-        // The day of week is from 0 to 6. In this case, 0 refers to Monday.
-        let currentTime = PCF8563.Time(
-            year: 2023, month: 4, day: 9, hour: 10,
-            minute: 26, second: 0, dayOfWeek: 6
-        )
-        // If the RTC has lost power, its time will be updated.
-        // If not, its time should be accurate and thus won't be changed.
-        // If you indeed need to adjust it, set the parameter `update` to `true`.
-        // rtc.setTime(currentTime, update: true)
-        rtc.setTime(currentTime)
-
-        while true {
-            let time = rtc.readTime()
-            print(formatDateTime(time))
-            sleep(ms: 1000)
-        }
-
-        // Add leading zero if number is one-digit.
-        // For example, number 1 will be 01.
-        func formatNum(_ number: UInt8) -> String {
-            return number < 10 ? "0\(number)" : "\(number)"
-        }
-
-        // Format the date and time, i.e. 2023/03/01 Wednesday 16:20:00.
-        func formatDateTime(_ time: PCF8563.Time) -> String {
-            var string = ""
-            string += "\(time.year)" + "/" + formatNum(time.month) + "/" + formatNum(time.day)
-            string += " " + daysOfWeek[Int(time.dayOfWeek)] + " "
-            string += formatNum(time.hour) + ":" + formatNum(time.minute) + ":" + formatNum(time.second)
-            return string
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Sources/main.swift b/Examples/SwiftIOPlayground/06RTC/ReadingTime/Sources/main.swift
new file mode 100644
index 0000000..5687d47
--- /dev/null
+++ b/Examples/SwiftIOPlayground/06RTC/ReadingTime/Sources/main.swift
@@ -0,0 +1,48 @@
+// Read current time from the RTC and print it every second.
+
+import SwiftIO
+import MadBoard
+import PCF8563
+
+
+let i2c = I2C(Id.I2C0)
+let rtc = PCF8563(i2c)
+
+let daysOfWeek = [
+    "Monday", "Tuesday", "Wednesday",
+    "Thursday", "Friday", "Saturday",
+    "Sunday"
+]
+
+// Please use current time to adjust the RTC time if it has been lost power.
+// The day of week is from 0 to 6. In this case, 0 refers to Monday.
+let currentTime = PCF8563.Time(
+    year: 2023, month: 4, day: 9, hour: 10,
+    minute: 26, second: 0, dayOfWeek: 6
+)
+// If the RTC has lost power, its time will be updated.
+// If not, its time should be accurate and thus won't be changed.
+// If you indeed need to adjust it, set the parameter `update` to `true`.
+// rtc.setTime(currentTime, update: true)
+rtc.setTime(currentTime)
+
+while true {
+    let time = rtc.readTime()
+    print(formatDateTime(time))
+    sleep(ms: 1000)
+}
+
+// Add leading zero if number is one-digit.
+// For example, number 1 will be 01.
+func formatNum(_ number: UInt8) -> String {
+    return number < 10 ? "0\(number)" : "\(number)"
+}
+
+// Format the date and time, i.e. 2023/03/01 Wednesday 16:20:00.
+func formatDateTime(_ time: PCF8563.Time) -> String {
+    var string = ""
+    string += "\(time.year)" + "/" + formatNum(time.month) + "/" + formatNum(time.day)
+    string += " " + daysOfWeek[Int(time.dayOfWeek)] + " "
+    string += formatNum(time.hour) + ":" + formatNum(time.minute) + ":" + formatNum(time.second)
+    return string
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Tests/ReadingTimeTests/ReadingTimeTests.swift b/Examples/SwiftIOPlayground/06RTC/ReadingTime/Tests/ReadingTimeTests/ReadingTimeTests.swift
deleted file mode 100644
index c052a30..0000000
--- a/Examples/SwiftIOPlayground/06RTC/ReadingTime/Tests/ReadingTimeTests/ReadingTimeTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import ReadingTime
-
-final class ReadingTimeTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(ReadingTime().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/.gitignore b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/.gitignore
+++ b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Package.swift b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Package.swift
index 766bfc0..9ee6962 100644
--- a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Package.swift
+++ b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Accelerometer",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Accelerometer",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "LIS3DH", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "LIS3DH", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AccelerometerTests",
-            dependencies: ["Accelerometer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/README.md b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/README.md
deleted file mode 100644
index 7171e7e..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Accelerometer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Sources/Accelerometer/Accelerometer.swift b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Sources/Accelerometer/Accelerometer.swift
deleted file mode 100644
index 2d28323..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Sources/Accelerometer/Accelerometer.swift
+++ /dev/null
@@ -1,24 +0,0 @@
-// Import SwiftIO to set the communication and MadBoard to use pin id. 
-import SwiftIO
-import MadBoard
-// Import LIS3DH to read the accelerations from the sensor.
-import LIS3DH
-
-@main
-public struct Accelerometer {
-    public static func main() {
-        // Initialize the I2C pins and the sensor.
-        let i2c = I2C(Id.I2C0)
-        let accelerometer = LIS3DH(i2c)
-
-        // Read the accelerations and each of them.
-        while true {
-            let accelerations = accelerometer.readXYZ()
-            print("x: \(accelerations.x)g")
-            print("y: \(accelerations.y)g")
-            print("z: \(accelerations.z)g")
-            print("\n")
-            sleep(ms: 1000)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Sources/main.swift b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Sources/main.swift
new file mode 100644
index 0000000..970bd52
--- /dev/null
+++ b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Sources/main.swift
@@ -0,0 +1,20 @@
+// Import SwiftIO to set the communication and MadBoard to use pin id. 
+import SwiftIO
+import MadBoard
+// Import LIS3DH to read the accelerations from the sensor.
+import LIS3DH
+
+
+// Initialize the I2C pins and the sensor.
+let i2c = I2C(Id.I2C0)
+let accelerometer = LIS3DH(i2c)
+
+// Read the accelerations and each of them.
+while true {
+    let accelerations = accelerometer.readXYZ()
+    print("x: \(accelerations.x)g")
+    print("y: \(accelerations.y)g")
+    print("z: \(accelerations.z)g")
+    print("\n")
+    sleep(ms: 1000)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Tests/AccelerometerTests/AccelerometerTests.swift b/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Tests/AccelerometerTests/AccelerometerTests.swift
deleted file mode 100644
index 97c9538..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/Accelerometer/Tests/AccelerometerTests/AccelerometerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Accelerometer
-
-final class AccelerometerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Accelerometer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/.gitignore b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/.gitignore
+++ b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Package.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Package.swift
index 8369b6b..05834bd 100644
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Package.swift
+++ b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "AccelerometerDice",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "AccelerometerDice",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "LIS3DH", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "LIS3DH", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AccelerometerDiceTests",
-            dependencies: ["AccelerometerDice"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/README.md b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/README.md
deleted file mode 100644
index 82cd25e..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# AccelerometerDice
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Sources/AccelerometerDice/AccelerometerDice.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Sources/AccelerometerDice/AccelerometerDice.swift
deleted file mode 100644
index b89057e..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Sources/AccelerometerDice/AccelerometerDice.swift
+++ /dev/null
@@ -1,40 +0,0 @@
-// Import SwiftIO to set input and output.
-import SwiftIO
-// Import MadBoard to use the id of the pins.
-import MadBoard
-// Import this driver to read accelerations on x, y, z-axis.
-import LIS3DH
-
-@main
-public struct AccelerometerDice {
-    public static func main() {
-        // Initialize an I2C interface and use it to set the sensor.
-        let i2c = I2C(Id.I2C0)
-        let dice = LIS3DH(i2c)
-
-        // Initialize an LED used as an indicator when shaking the sensor.
-        let indicator = DigitalOut(Id.D18)
-
-        // Create a variable to store the time after the sensor stops movement.
-        var steadyCount = 999
-
-        // Read accelerations to judge if the sensor is in motion. 
-        // Once the movement stops, a random number prints out.
-        while true {
-            let diceValue = dice.readXYZ()
-            
-            if abs(diceValue.x) > 0.3 || abs(diceValue.y) > 0.3 {
-                indicator.high()
-                steadyCount = 0
-            } else {
-                steadyCount += 1
-                if steadyCount == 50 {
-                    indicator.low()
-                    print(Int.random(in: 1...6))
-                }
-            }
-
-            sleep(ms: 5)
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Sources/main.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Sources/main.swift
new file mode 100644
index 0000000..23e2db5
--- /dev/null
+++ b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Sources/main.swift
@@ -0,0 +1,36 @@
+// Import SwiftIO to set input and output.
+import SwiftIO
+// Import MadBoard to use the id of the pins.
+import MadBoard
+// Import this driver to read accelerations on x, y, z-axis.
+import LIS3DH
+
+
+// Initialize an I2C interface and use it to set the sensor.
+let i2c = I2C(Id.I2C0)
+let dice = LIS3DH(i2c)
+
+// Initialize an LED used as an indicator when shaking the sensor.
+let indicator = DigitalOut(Id.D18)
+
+// Create a variable to store the time after the sensor stops movement.
+var steadyCount = 999
+
+// Read accelerations to judge if the sensor is in motion. 
+// Once the movement stops, a random number prints out.
+while true {
+    let diceValue = dice.readXYZ()
+    
+    if abs(diceValue.x) > 0.3 || abs(diceValue.y) > 0.3 {
+        indicator.high()
+        steadyCount = 0
+    } else {
+        steadyCount += 1
+        if steadyCount == 50 {
+            indicator.low()
+            print(Int.random(in: 1...6))
+        }
+    }
+
+    sleep(ms: 5)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Tests/AccelerometerDiceTests/AccelerometerDiceTests.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Tests/AccelerometerDiceTests/AccelerometerDiceTests.swift
deleted file mode 100644
index c95c406..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerDice/Tests/AccelerometerDiceTests/AccelerometerDiceTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import AccelerometerDice
-
-final class AccelerometerDiceTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(AccelerometerDice().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/.gitignore b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/.gitignore
+++ b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Package.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Package.swift
index 91333d8..28f9e23 100644
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Package.swift
+++ b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "AccelerometerLock",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "AccelerometerLock",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "LIS3DH", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "LIS3DH", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AccelerometerLockTests",
-            dependencies: ["AccelerometerLock"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/README.md b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/README.md
deleted file mode 100644
index 9eb5812..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# AccelerometerLock
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Sources/AccelerometerLock/AccelerometerLock.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Sources/AccelerometerLock/AccelerometerLock.swift
deleted file mode 100644
index 1a08432..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Sources/AccelerometerLock/AccelerometerLock.swift
+++ /dev/null
@@ -1,140 +0,0 @@
-// Unlock to turn on the LED.
-// The password consits of 3 random tilt directions (left/right/forward/backward).
-// Tilt your board and try to guess the password.
-// The LED turns on for 1s as an indicator if a move matches.
-// Any unmatched move will cause the game to restart.
-// After time is up and you haven't unlock it, the password will be changed.
-// Open the serial monitor for more notification during the game.
-
-// Import SwiftIO to set the communication and MadBoard to use pin id. 
-import SwiftIO
-import MadBoard
-// Import LIS3DH to read the accelerations from the sensor.
-import LIS3DH
-
-@main
-public struct AccelerometerLock {
-    public static func main() {
-        // Initialize the I2C pins and the sensor.
-        let i2c = I2C(Id.I2C0)
-        let accelerometer = LIS3DH(i2c)
-
-        // Initialize LED and buzzer as indicators.
-        let led = DigitalOut(Id.D18)
-        let buzzer = PWMOut(Id.PWM5A)
-
-        // Initialize the button to change the password.
-        let resetButton = DigitalIn(Id.D1)
-
-        // Initialize the timer with time limit of 30ms.
-        let timer = Timer(period: 30_000)
-
-        // Generate 3 random tilt directions as the password.
-        var password = [Direction](repeating: .left, count: 3)
-        updatePassword()
-
-        // Keep track of the index of direction.
-        var passwordIndex = 0
-
-        var reset = false
-        var start = false
-
-        // If time is up, reset the game.
-        timer.setInterrupt(start: false) {
-            reset = true
-        }
-
-        print("Tilt/move your board to start.")
-
-        while true {
-            if passwordIndex < password.count {
-                if let direction = getDirection(accelerometer.readXYZ()) {
-                    // After the first movement, start the timer.
-                    if !start {
-                        timer.start()
-                        start = true
-                    }
-
-                    // If the movement matches the desired one, generate a beep as an indicator.
-                    if direction == password[passwordIndex] {
-                        passwordIndex += 1
-                        print("Correct!")
-                        beep(500)
-                    } else {
-                        // If not, restart from the first direction.
-                        passwordIndex = 0
-                        print("Wrong! Restart from the first one...")
-                    }
-                }
-            } else if passwordIndex == password.count {
-                // If all 3 directions are matched, turn on the LED.
-                led.high()
-                print("Unlocked!")
-                timer.stop()
-                // End the game.
-                passwordIndex += 1
-            }
-
-            // If reset button is pressed, it's time to reset the game.
-            if resetButton.read() {
-                reset = true
-            }
-
-            // Generate 3 random directions as a new password and reset the game.
-            // The buzzer will beep as an indicator.
-            if reset {
-                updatePassword()
-                timer.stop()
-
-                passwordIndex = 0
-                start = false
-                reset = false
-
-                led.low()
-                beep(1000)
-
-                print("Timeout or reset button is pressed. Password is reset. Tilt/move your board to restart.")
-            }
-
-            sleep(ms: 20)
-        }
-
-        // Generate a short beep. 
-        func beep(_ frequency: Int) {
-            buzzer.set(frequency: frequency, dutycycle: 0.5)
-            sleep(ms: 300)
-            buzzer.suspend()
-        }
-
-        // Replace the previous password with a new one. 
-        func updatePassword() {
-            for i in 0..<password.count {
-                password[i] = Direction(rawValue: Int.random(in: 0..<4))!
-            }
-        }
-
-        // Decide the tilt direction depending on the xyz accelerations.
-        func getDirection(_ values: (x: Float, y: Float, z: Float)) -> Direction? {
-            if values.x > 0.5 {
-                return .left
-            } else if values.x < -0.5 {
-                return .right
-            }
-
-            if values.y > 0.5 {
-                return .backward
-            } else if values.y < -0.5 {
-                return .forward
-            } 
-
-            return nil
-        }
-
-        enum Direction: Int {
-            case left
-            case right
-            case forward
-            case backward
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Sources/main.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Sources/main.swift
new file mode 100644
index 0000000..77386e5
--- /dev/null
+++ b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Sources/main.swift
@@ -0,0 +1,136 @@
+// Unlock to turn on the LED.
+// The password consits of 3 random tilt directions (left/right/forward/backward).
+// Tilt your board and try to guess the password.
+// The LED turns on for 1s as an indicator if a move matches.
+// Any unmatched move will cause the game to restart.
+// After time is up and you haven't unlock it, the password will be changed.
+// Open the serial monitor for more notification during the game.
+
+// Import SwiftIO to set the communication and MadBoard to use pin id. 
+import SwiftIO
+import MadBoard
+// Import LIS3DH to read the accelerations from the sensor.
+import LIS3DH
+
+
+// Initialize the I2C pins and the sensor.
+let i2c = I2C(Id.I2C0)
+let accelerometer = LIS3DH(i2c)
+
+// Initialize LED and buzzer as indicators.
+let led = DigitalOut(Id.D18)
+let buzzer = PWMOut(Id.PWM5A)
+
+// Initialize the button to change the password.
+let resetButton = DigitalIn(Id.D1)
+
+// Initialize the timer with time limit of 30ms.
+let timer = Timer(period: 30_000)
+
+// Generate 3 random tilt directions as the password.
+var password = [Direction](repeating: .left, count: 3)
+updatePassword()
+
+// Keep track of the index of direction.
+var passwordIndex = 0
+
+var reset = false
+var start = false
+
+// If time is up, reset the game.
+timer.setInterrupt(start: false) {
+    reset = true
+}
+
+print("Tilt/move your board to start.")
+
+while true {
+    if passwordIndex < password.count {
+        if let direction = getDirection(accelerometer.readXYZ()) {
+            // After the first movement, start the timer.
+            if !start {
+                timer.start()
+                start = true
+            }
+
+            // If the movement matches the desired one, generate a beep as an indicator.
+            if direction == password[passwordIndex] {
+                passwordIndex += 1
+                print("Correct!")
+                beep(500)
+            } else {
+                // If not, restart from the first direction.
+                passwordIndex = 0
+                print("Wrong! Restart from the first one...")
+            }
+        }
+    } else if passwordIndex == password.count {
+        // If all 3 directions are matched, turn on the LED.
+        led.high()
+        print("Unlocked!")
+        timer.stop()
+        // End the game.
+        passwordIndex += 1
+    }
+
+    // If reset button is pressed, it's time to reset the game.
+    if resetButton.read() {
+        reset = true
+    }
+
+    // Generate 3 random directions as a new password and reset the game.
+    // The buzzer will beep as an indicator.
+    if reset {
+        updatePassword()
+        timer.stop()
+
+        passwordIndex = 0
+        start = false
+        reset = false
+
+        led.low()
+        beep(1000)
+
+        print("Timeout or reset button is pressed. Password is reset. Tilt/move your board to restart.")
+    }
+
+    sleep(ms: 20)
+}
+
+// Generate a short beep. 
+func beep(_ frequency: Int) {
+    buzzer.set(frequency: frequency, dutycycle: 0.5)
+    sleep(ms: 300)
+    buzzer.suspend()
+}
+
+// Replace the previous password with a new one. 
+func updatePassword() {
+    for i in 0..<password.count {
+        password[i] = Direction(rawValue: Int.random(in: 0..<4))!
+    }
+}
+
+// Decide the tilt direction depending on the xyz accelerations.
+func getDirection(_ values: (x: Float, y: Float, z: Float)) -> Direction? {
+    if values.x > 0.5 {
+        return .left
+    } else if values.x < -0.5 {
+        return .right
+    }
+
+    if values.y > 0.5 {
+        return .backward
+    } else if values.y < -0.5 {
+        return .forward
+    } 
+
+    return nil
+}
+
+enum Direction: Int {
+    case left
+    case right
+    case forward
+    case backward
+}
diff --git a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Tests/AccelerometerLockTests/AccelerometerLockTests.swift b/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Tests/AccelerometerLockTests/AccelerometerLockTests.swift
deleted file mode 100644
index 8945fc2..0000000
--- a/Examples/SwiftIOPlayground/07Accelerometer/AccelerometerLock/Tests/AccelerometerLockTests/AccelerometerLockTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import AccelerometerLock
-
-final class AccelerometerLockTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(AccelerometerLock().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/.gitignore b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/.gitignore
+++ b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Package.swift b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Package.swift
index 2701644..0fcedfc 100644
--- a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Package.swift
+++ b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "AccelerationVisualizer",
     dependencies: [
@@ -10,19 +12,16 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "AccelerationVisualizer",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
                 .product(name: "LIS3DH", package: "MadDrivers"),
-                .product(name: "ST7789", package: "MadDrivers")
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AccelerationVisualizerTests",
-            dependencies: ["AccelerationVisualizer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/README.md b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/README.md
deleted file mode 100644
index 388026f..0000000
--- a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# AccelerationVisualizer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/AccelerationVisualizer/AccelerationVisualizer.swift b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/AccelerationVisualizer/AccelerationVisualizer.swift
deleted file mode 100644
index 8e11940..0000000
--- a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/AccelerationVisualizer/AccelerationVisualizer.swift
+++ /dev/null
@@ -1,105 +0,0 @@
-// Visualize the x, y , z accelerations in the range by moving the corresponding sliders.
-
-import SwiftIO
-import MadBoard
-import LIS3DH
-import ST7789
-
-@main
-public struct AccelerationVisualizer {
-    public static func main() {
-        // Initialize the SPI pin and the digital pins for the LCD.
-        let spi = SPI(Id.SPI0, speed: 30_000_000)
-        let cs = DigitalOut(Id.D5)
-        let dc = DigitalOut(Id.D4)
-        let rst = DigitalOut(Id.D3)
-        let bl = DigitalOut(Id.D2)
-        // Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
-        let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
-
-        // Initialize the accelerometer using I2C communication.
-        let i2c = I2C (Id.I2C0)
-        let accelerometer = LIS3DH(i2c)
-
-        // 16-bit colors for acceleration bars.
-        let red: UInt16 = 0x07E0
-        let green: UInt16 = 0x001F
-        let blue: UInt16 = 0xF800
-
-        // Get the acceleration range of the sensor.
-        let gRange: Int
-        switch accelerometer.getRange() {
-        case .g2: gRange = 4
-        case .g4: gRange = 8
-        case .g8: gRange = 16
-        case .g16: gRange = 32
-        }
-
-        // Draw the bars of accelerations on x, y, z-axis.
-        let barWidth = 200
-        let barHeight = 40
-        let spacer = 20
-        let startY = (screen.height - barHeight * 3 - spacer * 2) / 2
-
-        var xBar = Bar(y: startY, width: barWidth, height: barHeight, color: red, screen: screen)
-        var yBar = Bar(y: startY + barHeight + spacer, width: barWidth, height: barHeight, color: green, screen: screen)
-        var zBar = Bar(y: startY + (barHeight + spacer) * 2, width: barWidth, height: barHeight, color: blue, screen: screen)
-
-        while true {
-            // Update the indicators' position in each bar according to the current accelerations.
-            let values = accelerometer.readXYZ()
-            xBar.update(values.x, gRange: gRange)
-            yBar.update(values.y, gRange: gRange)
-            zBar.update(values.z, gRange: gRange)
-            sleep(ms: 10)
-        }
-    }
-
-    struct Bar {
-        let x: Int
-        let y: Int
-        let width: Int
-        let height: Int
-        let screen: ST7789
-        let color: UInt16
-
-        var indicatorPos: Int?
-        let indicatorColor: UInt16 = 0xFFFF
-
-        // Draw a bar on the screen.
-        init(y: Int, width: Int, height: Int, color: UInt16, screen: ST7789) {
-            self.y = y
-            self.width = width
-            self.height = height
-            self.color = color
-            self.screen = screen
-            x = (screen.width - width) / 2
-
-            let data = [UInt16](repeating: color, count: width * height)
-            data.withUnsafeBytes {
-                screen.writeBitmap(x: x, y: y, width: width, height: height, data: $0)
-            }
-        }
-
-        // Update indicator's position in the bar with the latest value.
-        mutating func update(_ accel: Float, gRange: Int) {
-            let currentPos = x + Int((accel + 2) * Float((width - 1) / gRange))
-
-            if indicatorPos != currentPos {
-                // Draw the indicator at its current position.
-                for py in y..<y+height {
-                    screen.writePixel(x: currentPos, y: py, color: indicatorColor)
-                }
-
-                if let indicatorPos {
-                    // Remove the indicator from its previous position.
-                    for py in y..<y+height {
-                        screen.writePixel(x: indicatorPos, y: py, color: color)
-                    }
-                }
-
-                indicatorPos = currentPos
-            }
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/Bar.swift b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/Bar.swift
new file mode 100644
index 0000000..b2e5bc5
--- /dev/null
+++ b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/Bar.swift
@@ -0,0 +1,49 @@
+import ST7789
+
+struct Bar {
+    let x: Int
+    let y: Int
+    let width: Int
+    let height: Int
+    let screen: ST7789
+    let color: UInt16
+
+    var indicatorPos: Int?
+    let indicatorColor: UInt16 = 0xFFFF
+
+    // Draw a bar on the screen.
+    init(y: Int, width: Int, height: Int, color: UInt16, screen: ST7789) {
+        self.y = y
+        self.width = width
+        self.height = height
+        self.color = color
+        self.screen = screen
+        x = (screen.width - width) / 2
+
+        let data = [UInt16](repeating: color, count: width * height)
+        data.withUnsafeBytes {
+            screen.writeBitmap(x: x, y: y, width: width, height: height, data: $0)
+        }
+    }
+
+    // Update indicator's position in the bar with the latest value.
+    mutating func update(_ accel: Float, gRange: Int) {
+        let currentPos = x + Int((accel + 2) * Float((width - 1) / gRange))
+
+        if indicatorPos != currentPos {
+            // Draw the indicator at its current position.
+            for py in y..<y+height {
+                screen.writePixel(x: currentPos, y: py, color: indicatorColor)
+            }
+
+            if let indicatorPos {
+                // Remove the indicator from its previous position.
+                for py in y..<y+height {
+                    screen.writePixel(x: indicatorPos, y: py, color: color)
+                }
+            }
+
+            indicatorPos = currentPos
+        }
+    }
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/main.swift b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/main.swift
new file mode 100644
index 0000000..9ecc874
--- /dev/null
+++ b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Sources/main.swift
@@ -0,0 +1,53 @@
+// Visualize the x, y , z accelerations in the range by moving the corresponding sliders.
+
+import SwiftIO
+import MadBoard
+import LIS3DH
+import ST7789
+
+
+// Initialize the SPI pin and the digital pins for the LCD.
+let spi = SPI(Id.SPI0, speed: 30_000_000)
+let cs = DigitalOut(Id.D5)
+let dc = DigitalOut(Id.D4)
+let rst = DigitalOut(Id.D3)
+let bl = DigitalOut(Id.D2)
+// Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
+let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
+
+// Initialize the accelerometer using I2C communication.
+let i2c = I2C (Id.I2C0)
+let accelerometer = LIS3DH(i2c)
+
+// 16-bit colors for acceleration bars.
+let red: UInt16 = 0x07E0
+let green: UInt16 = 0x001F
+let blue: UInt16 = 0xF800
+
+// Get the acceleration range of the sensor.
+let gRange: Int
+switch accelerometer.getRange() {
+case .g2: gRange = 4
+case .g4: gRange = 8
+case .g8: gRange = 16
+case .g16: gRange = 32
+}
+
+// Draw the bars of accelerations on x, y, z-axis.
+let barWidth = 200
+let barHeight = 40
+let spacer = 20
+let startY = (screen.height - barHeight * 3 - spacer * 2) / 2
+
+var xBar = Bar(y: startY, width: barWidth, height: barHeight, color: red, screen: screen)
+var yBar = Bar(y: startY + barHeight + spacer, width: barWidth, height: barHeight, color: green, screen: screen)
+var zBar = Bar(y: startY + (barHeight + spacer) * 2, width: barWidth, height: barHeight, color: blue, screen: screen)
+
+while true {
+    // Update the indicators' position in each bar according to the current accelerations.
+    let values = accelerometer.readXYZ()
+    xBar.update(values.x, gRange: gRange)
+    yBar.update(values.y, gRange: gRange)
+    zBar.update(values.z, gRange: gRange)
+    sleep(ms: 10)
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Tests/AccelerationVisualizerTests/AccelerationVisualizerTests.swift b/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Tests/AccelerationVisualizerTests/AccelerationVisualizerTests.swift
deleted file mode 100644
index 47ce0e9..0000000
--- a/Examples/SwiftIOPlayground/08LCD/AccelerationVisualizer/Tests/AccelerationVisualizerTests/AccelerationVisualizerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import AccelerationVisualizer
-
-final class AccelerationVisualizerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(AccelerationVisualizer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/.gitignore b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/.gitignore
+++ b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Package.swift b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Package.swift
index 7adf096..deaf2ee 100644
--- a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Package.swift
+++ b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "AnalogVisualizer",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "AnalogVisualizer",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "AnalogVisualizerTests",
-            dependencies: ["AnalogVisualizer"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/README.md b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/README.md
deleted file mode 100644
index 3dfb26c..0000000
--- a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# AnalogVisualizer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Sources/AnalogVisualizer/AnalogVisualizer.swift b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Sources/AnalogVisualizer/AnalogVisualizer.swift
deleted file mode 100644
index 1a116a0..0000000
--- a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Sources/AnalogVisualizer/AnalogVisualizer.swift
+++ /dev/null
@@ -1,65 +0,0 @@
-// Visualize analog values on the screen.
-// The line height changes with the value from the potentiometer.
-
-import SwiftIO
-import MadBoard
-import ST7789
-
-@main
-public struct AnalogVisualizer {
-    public static func main() {
-        // Initialize the SPI pin and the digital pins for the LCD.
-        let spi = SPI(Id.SPI0, speed: 30_000_000)
-        let cs = DigitalOut(Id.D5)
-        let dc = DigitalOut(Id.D4)
-        let rst = DigitalOut(Id.D3)
-        let bl = DigitalOut(Id.D2)
-
-        // Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
-        let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
-
-        // Initialize the analog pin for the potentiometer.
-        let pot = AnalogIn(Id.A0)
-
-        // The max line height drawn on the screen.
-        let maxHeight = 200
-
-        let white: UInt16 = 0xFFFF
-        let black: UInt16 = 0
-
-        // Store the previous heights to make a scrolling display.
-        var heightValues = [Int](repeating: 0, count: screen.width)
-
-        while true {
-            // Read current analog value and map it to height.
-            let height = pot.readRawValue() * maxHeight / pot.maxRawValue
-
-            // Update line heights for display.
-            heightValues.removeFirst()
-            heightValues.append(height)
-
-            // Iterate over the array to draw vertical lines with the given height.
-            for i in 0..<heightValues.count-1 {
-                let lastHeight = heightValues[i]
-                let currentHeight = heightValues[i+1]
-
-                // Compare the line heights and update the line.
-                if lastHeight > currentHeight {
-                    drawLine(x: i, y: screen.height - lastHeight, height: lastHeight - currentHeight, color: black)
-                } else if lastHeight < currentHeight {
-                    drawLine(x: i, y: screen.height - currentHeight, height: currentHeight - lastHeight, color: white)
-                }
-            }
-
-            sleep(ms: 100)
-        }
-
-        // Draw a vertical line on the screen.
-        func drawLine(x: Int, y: Int, height: Int, color: UInt16) {
-            let buffer = [UInt16](repeating: color, count: height)
-            buffer.withUnsafeBytes {
-                screen.writeBitmap(x: x, y: y, width: 1, height: height, data: $0)
-            }
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Sources/main.swift b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Sources/main.swift
new file mode 100644
index 0000000..49ac9e5
--- /dev/null
+++ b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Sources/main.swift
@@ -0,0 +1,61 @@
+// Visualize analog values on the screen.
+// The line height changes with the value from the potentiometer.
+
+import SwiftIO
+import MadBoard
+import ST7789
+
+
+// Initialize the SPI pin and the digital pins for the LCD.
+let spi = SPI(Id.SPI0, speed: 30_000_000)
+let cs = DigitalOut(Id.D5)
+let dc = DigitalOut(Id.D4)
+let rst = DigitalOut(Id.D3)
+let bl = DigitalOut(Id.D2)
+
+// Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
+let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
+
+// Initialize the analog pin for the potentiometer.
+let pot = AnalogIn(Id.A0)
+
+// The max line height drawn on the screen.
+let maxHeight = 200
+
+let white: UInt16 = 0xFFFF
+let black: UInt16 = 0
+
+// Store the previous heights to make a scrolling display.
+var heightValues = [Int](repeating: 0, count: screen.width)
+
+while true {
+    // Read current analog value and map it to height.
+    let height = pot.readRawValue() * maxHeight / pot.maxRawValue
+
+    // Update line heights for display.
+    heightValues.removeFirst()
+    heightValues.append(height)
+
+    // Iterate over the array to draw vertical lines with the given height.
+    for i in 0..<heightValues.count-1 {
+        let lastHeight = heightValues[i]
+        let currentHeight = heightValues[i+1]
+
+        // Compare the line heights and update the line.
+        if lastHeight > currentHeight {
+            drawLine(x: i, y: screen.height - lastHeight, height: lastHeight - currentHeight, color: black)
+        } else if lastHeight < currentHeight {
+            drawLine(x: i, y: screen.height - currentHeight, height: currentHeight - lastHeight, color: white)
+        }
+    }
+
+    sleep(ms: 100)
+}
+
+// Draw a vertical line on the screen.
+func drawLine(x: Int, y: Int, height: Int, color: UInt16) {
+    let buffer = [UInt16](repeating: color, count: height)
+    buffer.withUnsafeBytes {
+        screen.writeBitmap(x: x, y: y, width: 1, height: height, data: $0)
+    }
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Tests/AnalogVisualizerTests/AnalogVisualizerTests.swift b/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Tests/AnalogVisualizerTests/AnalogVisualizerTests.swift
deleted file mode 100644
index 44029b0..0000000
--- a/Examples/SwiftIOPlayground/08LCD/AnalogVisualizer/Tests/AnalogVisualizerTests/AnalogVisualizerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import AnalogVisualizer
-
-final class AnalogVisualizerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(AnalogVisualizer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/LCD/.gitignore b/Examples/SwiftIOPlayground/08LCD/LCD/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/08LCD/LCD/.gitignore
+++ b/Examples/SwiftIOPlayground/08LCD/LCD/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/08LCD/LCD/Package.swift b/Examples/SwiftIOPlayground/08LCD/LCD/Package.swift
index 17b153f..91c78e4 100644
--- a/Examples/SwiftIOPlayground/08LCD/LCD/Package.swift
+++ b/Examples/SwiftIOPlayground/08LCD/LCD/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LCD",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LCD",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "LCDTests",
-            dependencies: ["LCD"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/08LCD/LCD/README.md b/Examples/SwiftIOPlayground/08LCD/LCD/README.md
deleted file mode 100644
index 95b8013..0000000
--- a/Examples/SwiftIOPlayground/08LCD/LCD/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LCD
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/08LCD/LCD/Sources/LCD/LCD.swift b/Examples/SwiftIOPlayground/08LCD/LCD/Sources/LCD/LCD.swift
deleted file mode 100644
index 7e575bb..0000000
--- a/Examples/SwiftIOPlayground/08LCD/LCD/Sources/LCD/LCD.swift
+++ /dev/null
@@ -1,93 +0,0 @@
-// Import SwiftIO to set the communication and MadBoard to use pin id. 
-import SwiftIO
-import MadBoard
-// Import the library to configure the LCD and write pixels on it.
-import ST7789
-
-@main
-public struct LCD {
-    public static func main() {
-        // Initialize the SPI pin and the digital pins for the LCD.
-        let spi = SPI(Id.SPI0, speed: 30_000_000)
-        let cs = DigitalOut(Id.D5)
-        let dc = DigitalOut(Id.D4)
-        let rst = DigitalOut(Id.D3)
-        let bl = DigitalOut(Id.D2)
-
-        // Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
-        let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
-
-        // Store some color values for easier reference later.
-        let black: UInt16 = 0x0000
-        let red: UInt16 = 0xF800
-        let green: UInt16 = 0x07E0
-        let blue: UInt16 = 0x001F
-        let white: UInt16 = 0xFFFF
-
-        // Fill the whole screen with red, green, blue, white, and black in turns. 
-        // The color changes every second. 
-        screen.clearScreen(red)
-        sleep(ms: 1000)
-
-        screen.clearScreen(green)
-        sleep(ms: 1000)
-
-        screen.clearScreen(blue)
-        sleep(ms: 1000)
-
-        screen.clearScreen(white)
-        sleep(ms: 1000)
-
-        screen.clearScreen(black)
-        sleep(ms: 1000)
-
-        // Draw red horizontal lines every 10 rows, so the lines will be on rows 0, 10, 20, ..., 230.
-        for y in stride(from: 0, to: screen.height, by: 10) {
-            for x in 0..<screen.width {
-                screen.writePixel(x: x, y: y, color: red)
-            }
-        }
-        sleep(ms: 1000)
-
-        // Draw blue vertical lines every 10 columns, so the lines will be on columns 0, 10, 20, ..., 230.
-        for x in stride(from: 0, to: screen.width, by: 10) {
-            for y in 0..<screen.height {
-                screen.writePixel(x: x, y: y, color: blue)
-            }
-        }
-        sleep(ms: 1000)
-
-        // Paint the screen black to erase all stuff on it.
-        screen.clearScreen(black)
-        sleep(ms: 1000)
-
-        // Store the colors of four squares for later use.
-        let colors = [red, green, blue, white]
-
-        // Set the size of the square.
-        let width = 80
-
-        // First, draw a 80x80 red square from the origin. 
-        // After one second, draw a green one from the centre of the red square.
-        // The blue and white ones are similar.
-        while true {
-            var x = 0, y = 0
-
-            for color in colors {
-                fillSquare(x: x, y: y, width: width, color: color)
-                x += width / 2
-                y += width / 2
-                sleep(ms: 1000)
-            }
-        }
-
-        // This function allows you to draw a square on the LCD from the point (x,y).
-        func fillSquare(x: Int, y: Int, width: Int, color: UInt16) {
-            for px in y..<(y + width) {
-                for py in x..<(x + width) {
-                    screen.writePixel(x: px, y: py, color: color)
-                }
-            }
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/LCD/Sources/main.swift b/Examples/SwiftIOPlayground/08LCD/LCD/Sources/main.swift
new file mode 100644
index 0000000..49b5ed9
--- /dev/null
+++ b/Examples/SwiftIOPlayground/08LCD/LCD/Sources/main.swift
@@ -0,0 +1,89 @@
+// Import SwiftIO to set the communication and MadBoard to use pin id. 
+import SwiftIO
+import MadBoard
+// Import the library to configure the LCD and write pixels on it.
+import ST7789
+
+
+// Initialize the SPI pin and the digital pins for the LCD.
+let spi = SPI(Id.SPI0, speed: 30_000_000)
+let cs = DigitalOut(Id.D5)
+let dc = DigitalOut(Id.D4)
+let rst = DigitalOut(Id.D3)
+let bl = DigitalOut(Id.D2)
+
+// Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
+let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
+
+// Store some color values for easier reference later.
+let black: UInt16 = 0x0000
+let red: UInt16 = 0xF800
+let green: UInt16 = 0x07E0
+let blue: UInt16 = 0x001F
+let white: UInt16 = 0xFFFF
+
+// Fill the whole screen with red, green, blue, white, and black in turns. 
+// The color changes every second. 
+screen.clearScreen(red)
+sleep(ms: 1000)
+
+screen.clearScreen(green)
+sleep(ms: 1000)
+
+screen.clearScreen(blue)
+sleep(ms: 1000)
+
+screen.clearScreen(white)
+sleep(ms: 1000)
+
+screen.clearScreen(black)
+sleep(ms: 1000)
+
+// Draw red horizontal lines every 10 rows, so the lines will be on rows 0, 10, 20, ..., 230.
+for y in stride(from: 0, to: screen.height, by: 10) {
+    for x in 0..<screen.width {
+        screen.writePixel(x: x, y: y, color: red)
+    }
+}
+sleep(ms: 1000)
+
+// Draw blue vertical lines every 10 columns, so the lines will be on columns 0, 10, 20, ..., 230.
+for x in stride(from: 0, to: screen.width, by: 10) {
+    for y in 0..<screen.height {
+        screen.writePixel(x: x, y: y, color: blue)
+    }
+}
+sleep(ms: 1000)
+
+// Paint the screen black to erase all stuff on it.
+screen.clearScreen(black)
+sleep(ms: 1000)
+
+// Store the colors of four squares for later use.
+let colors = [red, green, blue, white]
+
+// Set the size of the square.
+let width = 80
+
+// First, draw a 80x80 red square from the origin. 
+// After one second, draw a green one from the centre of the red square.
+// The blue and white ones are similar.
+while true {
+    var x = 0, y = 0
+
+    for color in colors {
+        fillSquare(x: x, y: y, width: width, color: color)
+        x += width / 2
+        y += width / 2
+        sleep(ms: 1000)
+    }
+}
+
+// This function allows you to draw a square on the LCD from the point (x,y).
+func fillSquare(x: Int, y: Int, width: Int, color: UInt16) {
+    for px in y..<(y + width) {
+        for py in x..<(x + width) {
+            screen.writePixel(x: px, y: py, color: color)
+        }
+    }
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/08LCD/LCD/Tests/LCDTests/LCDTests.swift b/Examples/SwiftIOPlayground/08LCD/LCD/Tests/LCDTests/LCDTests.swift
deleted file mode 100644
index dc0d15e..0000000
--- a/Examples/SwiftIOPlayground/08LCD/LCD/Tests/LCDTests/LCDTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LCD
-
-final class LCDTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LCD().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/Rainbow/.gitignore b/Examples/SwiftIOPlayground/08LCD/Rainbow/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/08LCD/Rainbow/.gitignore
+++ b/Examples/SwiftIOPlayground/08LCD/Rainbow/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/08LCD/Rainbow/Package.swift b/Examples/SwiftIOPlayground/08LCD/Rainbow/Package.swift
index 6bea564..1a400a4 100644
--- a/Examples/SwiftIOPlayground/08LCD/Rainbow/Package.swift
+++ b/Examples/SwiftIOPlayground/08LCD/Rainbow/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Rainbow",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Rainbow",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "RainbowTests",
-            dependencies: ["Rainbow"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/08LCD/Rainbow/README.md b/Examples/SwiftIOPlayground/08LCD/Rainbow/README.md
deleted file mode 100644
index cb8f0e0..0000000
--- a/Examples/SwiftIOPlayground/08LCD/Rainbow/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Rainbow
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/08LCD/Rainbow/Sources/Rainbow/Rainbow.swift b/Examples/SwiftIOPlayground/08LCD/Rainbow/Sources/Rainbow/Rainbow.swift
deleted file mode 100644
index 7766f82..0000000
--- a/Examples/SwiftIOPlayground/08LCD/Rainbow/Sources/Rainbow/Rainbow.swift
+++ /dev/null
@@ -1,55 +0,0 @@
-// Fill the screen with rainbow colors.
-
-import SwiftIO
-import MadBoard
-import ST7789
-
-@main
-public struct Rainbow {
-    public static func main() {
-        // Initialize the SPI pin and the digital pins for the LCD.
-        let spi = SPI(Id.SPI0, speed: 30_000_000)
-        let cs = DigitalOut(Id.D5)
-        let dc = DigitalOut(Id.D4)
-        let rst = DigitalOut(Id.D3)
-        let bl = DigitalOut(Id.D2)
-
-        // Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
-        let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
-
-        let red: UInt32 = 0xFF0000
-        let orange: UInt32 = 0xFF7F00
-        let yellow: UInt32 = 0xFFFF00
-        let green: UInt32 = 0x00FF00
-        let blue: UInt32 = 0x0000FF
-        let indigo: UInt32 = 0x4B0082
-        let violet: UInt32 = 0x9400D3
-        let colors888 = [red, orange, yellow, green, blue, indigo, violet]
-        // Get 16bit color data.
-        let colors565: [UInt16] = colors888.map { getRGB565LE($0) }
-        
-        // The width for each color bar.
-        let width = screen.width / colors565.count
-
-        while true {
-            // Use 7 colors in order to draw rectangles on display.
-            for i in colors565.indices {
-                for y in 0..<screen.height {
-                    for x in (width*i)..<(width*(i+1)) {
-                        screen.writePixel(x: x, y: y, color: colors565[i])
-                    }
-                }
-            }
-
-            sleep(ms: 1000)
-            // Fill the display with black.
-            screen.clearScreen(0)
-        }
-
-        // The screen needs RGB565 color data, so change color data from UInt32 to UInt16.
-        // Besides, the board uses little endian format, so the bytes are swapped.
-        func getRGB565LE(_ color: UInt32) -> UInt16 {
-            return UInt16(((color & 0xF80000) >> 8) | ((color & 0xFC00) >> 5) | ((color & 0xF8) >> 3)).byteSwapped
-        }
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/Rainbow/Sources/main.swift b/Examples/SwiftIOPlayground/08LCD/Rainbow/Sources/main.swift
new file mode 100644
index 0000000..759fc56
--- /dev/null
+++ b/Examples/SwiftIOPlayground/08LCD/Rainbow/Sources/main.swift
@@ -0,0 +1,51 @@
+// Fill the screen with rainbow colors.
+
+import SwiftIO
+import MadBoard
+import ST7789
+
+
+// Initialize the SPI pin and the digital pins for the LCD.
+let spi = SPI(Id.SPI0, speed: 30_000_000)
+let cs = DigitalOut(Id.D5)
+let dc = DigitalOut(Id.D4)
+let rst = DigitalOut(Id.D3)
+let bl = DigitalOut(Id.D2)
+
+// Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
+let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
+
+let red: UInt32 = 0xFF0000
+let orange: UInt32 = 0xFF7F00
+let yellow: UInt32 = 0xFFFF00
+let green: UInt32 = 0x00FF00
+let blue: UInt32 = 0x0000FF
+let indigo: UInt32 = 0x4B0082
+let violet: UInt32 = 0x9400D3
+let colors888 = [red, orange, yellow, green, blue, indigo, violet]
+// Get 16bit color data.
+let colors565: [UInt16] = colors888.map { getRGB565LE($0) }
+
+// The width for each color bar.
+let width = screen.width / colors565.count
+
+while true {
+    // Use 7 colors in order to draw rectangles on display.
+    for i in colors565.indices {
+        for y in 0..<screen.height {
+            for x in (width*i)..<(width*(i+1)) {
+                screen.writePixel(x: x, y: y, color: colors565[i])
+            }
+        }
+    }
+
+    sleep(ms: 1000)
+    // Fill the display with black.
+    screen.clearScreen(0)
+}
+
+// The screen needs RGB565 color data, so change color data from UInt32 to UInt16.
+// Besides, the board uses little endian format, so the bytes are swapped.
+func getRGB565LE(_ color: UInt32) -> UInt16 {
+    return UInt16(((color & 0xF80000) >> 8) | ((color & 0xFC00) >> 5) | ((color & 0xF8) >> 3)).byteSwapped
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/08LCD/Rainbow/Tests/RainbowTests/RainbowTests.swift b/Examples/SwiftIOPlayground/08LCD/Rainbow/Tests/RainbowTests/RainbowTests.swift
deleted file mode 100644
index 8c4eb62..0000000
--- a/Examples/SwiftIOPlayground/08LCD/Rainbow/Tests/RainbowTests/RainbowTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Rainbow
-
-final class RainbowTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Rainbow().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/.gitignore b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/.gitignore
+++ b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Package.swift b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Package.swift
index 9d53f06..56edebd 100644
--- a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Package.swift
+++ b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "ScrollEffect",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "ScrollEffect",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "ScrollEffectTests",
-            dependencies: ["ScrollEffect"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/README.md b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/README.md
deleted file mode 100644
index 7515c5f..0000000
--- a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# ScrollEffect
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Sources/ScrollEffect/ScrollEffect.swift b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Sources/ScrollEffect/ScrollEffect.swift
deleted file mode 100644
index f2f584d..0000000
--- a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Sources/ScrollEffect/ScrollEffect.swift
+++ /dev/null
@@ -1,59 +0,0 @@
-// Create a scroll effect to update the display with rainbow colors in turn.
-import SwiftIO
-import MadBoard
-import ST7789
-
-@main
-public struct ScrollEffect {
-    public static func main() {
-        // Initialize the SPI pin and the digital pins for the LCD.
-        let spi = SPI(Id.SPI0, speed: 30_000_000)
-        let cs = DigitalOut(Id.D5)
-        let dc = DigitalOut(Id.D4)
-        let rst = DigitalOut(Id.D3)
-        let bl = DigitalOut(Id.D2)
-
-        // Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
-        let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
-
-        let red: UInt32 = 0xFF0000
-        let orange: UInt32 = 0xFF7F00
-        let yellow: UInt32 = 0xFFFF00
-        let green: UInt32 = 0x00FF00
-        let blue: UInt32 = 0x0000FF
-        let indigo: UInt32 = 0x4B0082
-        let violet: UInt32 = 0x9400D3
-        let colors888 = [red, orange, yellow, green, blue, indigo, violet]
-        // Get 16bit color data.
-        let colors565: [UInt16] = colors888.map { getRGB565LE($0) }
-
-        let scrollStep = 5
-        var buffer = [UInt16](repeating: 0, count: scrollStep * screen.height)
-
-        while true {
-            // Loop over the colors.
-            for color in colors565 {
-                // Move left by updating the area with new color.
-                for i in 1..<screen.width / scrollStep {
-                    // Replace all data with current color.
-                    buffer.indices.forEach { buffer[$0] = color }
-
-                    // Send the data to the screen using SPI to update the specified area.
-                    let x = screen.width - i * scrollStep - 1
-                    buffer.withUnsafeBytes {
-                        screen.writeBitmap(x: x, y: 0, width: scrollStep, height: screen.height, data: $0)
-                    }
-
-                    sleep(ms: 30)
-                }
-            }
-        }
-
-        // The screen needs RGB565 color data, so change color data from UInt32 to UInt16.
-        // Besides, the board uses little endian format, so the bytes are swapped.
-        func getRGB565LE(_ color: UInt32) -> UInt16 {
-            return UInt16(((color & 0xF80000) >> 8) | ((color & 0xFC00) >> 5) | ((color & 0xF8) >> 3)).byteSwapped
-        }
-    }
-}
-
diff --git a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Sources/main.swift b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Sources/main.swift
new file mode 100644
index 0000000..44282cb
--- /dev/null
+++ b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Sources/main.swift
@@ -0,0 +1,54 @@
+// Create a scroll effect to update the display with rainbow colors in turn.
+import SwiftIO
+import MadBoard
+import ST7789
+
+
+// Initialize the SPI pin and the digital pins for the LCD.
+let spi = SPI(Id.SPI0, speed: 30_000_000)
+let cs = DigitalOut(Id.D5)
+let dc = DigitalOut(Id.D4)
+let rst = DigitalOut(Id.D3)
+let bl = DigitalOut(Id.D2)
+
+// Initialize the LCD using the pins above. Rotate the screen to keep the original at the upper left.
+let screen = ST7789(spi: spi, cs: cs, dc: dc, rst: rst, bl: bl, rotation: .angle90)
+
+let red: UInt32 = 0xFF0000
+let orange: UInt32 = 0xFF7F00
+let yellow: UInt32 = 0xFFFF00
+let green: UInt32 = 0x00FF00
+let blue: UInt32 = 0x0000FF
+let indigo: UInt32 = 0x4B0082
+let violet: UInt32 = 0x9400D3
+let colors888 = [red, orange, yellow, green, blue, indigo, violet]
+// Get 16bit color data.
+let colors565: [UInt16] = colors888.map { getRGB565LE($0) }
+
+let scrollStep = 5
+var buffer = [UInt16](repeating: 0, count: scrollStep * screen.height)
+
+while true {
+    // Loop over the colors.
+    for color in colors565 {
+        // Move left by updating the area with new color.
+        for i in 1..<screen.width / scrollStep {
+            // Replace all data with current color.
+            buffer.indices.forEach { buffer[$0] = color }
+
+            // Send the data to the screen using SPI to update the specified area.
+            let x = screen.width - i * scrollStep - 1
+            buffer.withUnsafeBytes {
+                screen.writeBitmap(x: x, y: 0, width: scrollStep, height: screen.height, data: $0)
+            }
+
+            sleep(ms: 30)
+        }
+    }
+}
+
+// The screen needs RGB565 color data, so change color data from UInt32 to UInt16.
+// Besides, the board uses little endian format, so the bytes are swapped.
+func getRGB565LE(_ color: UInt32) -> UInt16 {
+    return UInt16(((color & 0xF80000) >> 8) | ((color & 0xFC00) >> 5) | ((color & 0xF8) >> 3)).byteSwapped
+}
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Tests/ScrollEffectTests/ScrollEffectTests.swift b/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Tests/ScrollEffectTests/ScrollEffectTests.swift
deleted file mode 100644
index 60aa96f..0000000
--- a/Examples/SwiftIOPlayground/08LCD/ScrollEffect/Tests/ScrollEffectTests/ScrollEffectTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import ScrollEffect
-
-final class ScrollEffectTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(ScrollEffect().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/.gitignore b/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/.gitignore
+++ b/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Package.swift b/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Package.swift
index 0668002..18af9fd 100644
--- a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Package.swift
+++ b/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "MusicPlayer",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "MusicPlayer",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "MusicPlayerTests",
-            dependencies: ["MusicPlayer"]),
     ]
-)
+)
\ No newline at end of file
diff --git a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/README.md b/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/README.md
deleted file mode 100644
index f505bc0..0000000
--- a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# MusicPlayer
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Tests/MusicPlayerTests/MusicPlayerTests.swift b/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Tests/MusicPlayerTests/MusicPlayerTests.swift
deleted file mode 100644
index b6ce80e..0000000
--- a/Examples/SwiftIOPlayground/09Speaker/MusicPlayer/Tests/MusicPlayerTests/MusicPlayerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import MusicPlayer
-
-final class MusicPlayerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(MusicPlayer().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/09Speaker/Speaker/.gitignore b/Examples/SwiftIOPlayground/09Speaker/Speaker/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/09Speaker/Speaker/.gitignore
+++ b/Examples/SwiftIOPlayground/09Speaker/Speaker/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/09Speaker/Speaker/Package.swift b/Examples/SwiftIOPlayground/09Speaker/Speaker/Package.swift
index 591c48e..5737f34 100644
--- a/Examples/SwiftIOPlayground/09Speaker/Speaker/Package.swift
+++ b/Examples/SwiftIOPlayground/09Speaker/Speaker/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Speaker",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Speaker",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "SpeakerTests",
-            dependencies: ["Speaker"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/09Speaker/Speaker/README.md b/Examples/SwiftIOPlayground/09Speaker/Speaker/README.md
deleted file mode 100644
index efab5cc..0000000
--- a/Examples/SwiftIOPlayground/09Speaker/Speaker/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Speaker
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/09Speaker/Speaker/Tests/SpeakerTests/SpeakerTests.swift b/Examples/SwiftIOPlayground/09Speaker/Speaker/Tests/SpeakerTests/SpeakerTests.swift
deleted file mode 100644
index 15f2716..0000000
--- a/Examples/SwiftIOPlayground/09Speaker/Speaker/Tests/SpeakerTests/SpeakerTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Speaker
-
-final class SpeakerTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Speaker().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/.gitignore b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/.gitignore
+++ b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Package.swift b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Package.swift
index bc81660..a65c1a3 100644
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Package.swift
+++ b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Button",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Button",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "ButtonTests",
-            dependencies: ["Button"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/README.md b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/README.md
deleted file mode 100644
index a944a74..0000000
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Button
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Tests/ButtonTests/ButtonTests.swift b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Tests/ButtonTests/ButtonTests.swift
deleted file mode 100644
index 4386beb..0000000
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/Button/Tests/ButtonTests/ButtonTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Button
-
-final class ButtonTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Button().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/.gitignore b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/.gitignore
+++ b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Package.swift b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Package.swift
index 9562da2..1814674 100644
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Package.swift
+++ b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "LED",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "LED",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
             ]),
-        .testTarget(
-            name: "LEDTests",
-            dependencies: ["LED"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/README.md b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/README.md
deleted file mode 100644
index fe9c3f4..0000000
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# LED
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Tests/LEDTests/LEDTests.swift b/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Tests/LEDTests/LEDTests.swift
deleted file mode 100644
index 34ba0cd..0000000
--- a/Examples/SwiftIOPlayground/10UART/RemoteLEDSwitch/LED/Tests/LEDTests/LEDTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import LED
-
-final class LEDTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(LED().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/10UART/SerialEcho/.gitignore b/Examples/SwiftIOPlayground/10UART/SerialEcho/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/10UART/SerialEcho/.gitignore
+++ b/Examples/SwiftIOPlayground/10UART/SerialEcho/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/10UART/SerialEcho/Package.swift b/Examples/SwiftIOPlayground/10UART/SerialEcho/Package.swift
index e8191a6..0ab3dcd 100644
--- a/Examples/SwiftIOPlayground/10UART/SerialEcho/Package.swift
+++ b/Examples/SwiftIOPlayground/10UART/SerialEcho/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "SerialEcho",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "SerialEcho",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "SerialEchoTests",
-            dependencies: ["SerialEcho"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/10UART/SerialEcho/README.md b/Examples/SwiftIOPlayground/10UART/SerialEcho/README.md
deleted file mode 100644
index 76c78b2..0000000
--- a/Examples/SwiftIOPlayground/10UART/SerialEcho/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# SerialEcho
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/10UART/SerialEcho/Tests/SerialEchoTests/SerialEchoTests.swift b/Examples/SwiftIOPlayground/10UART/SerialEcho/Tests/SerialEchoTests/SerialEchoTests.swift
deleted file mode 100644
index ec04663..0000000
--- a/Examples/SwiftIOPlayground/10UART/SerialEcho/Tests/SerialEchoTests/SerialEchoTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import SerialEcho
-
-final class SerialEchoTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(SerialEcho().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/.gitignore b/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/.gitignore
+++ b/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Package.swift b/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Package.swift
index 9044506..270baf8 100644
--- a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Package.swift
+++ b/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "SerialLEDSwitch",
     dependencies: [
@@ -9,16 +11,13 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadBoards.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "SerialLEDSwitch",
             dependencies: [
                 "SwiftIO",
-                "MadBoards"
+                "MadBoards",
             ]),
-        .testTarget(
-            name: "SerialLEDSwitchTests",
-            dependencies: ["SerialLEDSwitch"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/README.md b/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/README.md
deleted file mode 100644
index 46b7297..0000000
--- a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# SerialLEDSwitch
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Tests/SerialLEDSwitchTests/SerialLEDSwitchTests.swift b/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Tests/SerialLEDSwitchTests/SerialLEDSwitchTests.swift
deleted file mode 100644
index 6ce8b14..0000000
--- a/Examples/SwiftIOPlayground/10UART/SerialLEDSwitch/Tests/SerialLEDSwitchTests/SerialLEDSwitchTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import SerialLEDSwitch
-
-final class SerialLEDSwitchTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(SerialLEDSwitch().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/.gitignore b/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/.gitignore
+++ b/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Package.swift b/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Package.swift
index 1dbd4f1..dcc0bcb 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Package.swift
+++ b/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "MorseCode",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "MorseCode",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "MorseCodeTests",
-            dependencies: ["MorseCode"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/README.md b/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/README.md
deleted file mode 100644
index 71a7cb1..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# MorseCode
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Tests/MorseCodeTests/MorseCodeTests.swift b/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Tests/MorseCodeTests/MorseCodeTests.swift
deleted file mode 100644
index 822d2b6..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/MorseCode/Tests/MorseCodeTests/MorseCodeTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import MorseCode
-
-final class MorseCodeTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(MorseCode().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/.gitignore b/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/.gitignore
+++ b/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Package.swift b/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Package.swift
index 8ed4ac6..f48258a 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Package.swift
+++ b/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "MovingBall",
     dependencies: [
@@ -10,19 +12,16 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "MovingBall",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
                 .product(name: "ST7789", package: "MadDrivers"),
-                .product(name: "LIS3DH", package: "MadDrivers")            
+                .product(name: "LIS3DH", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "MovingBallTests",
-            dependencies: ["MovingBall"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/README.md b/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/README.md
deleted file mode 100644
index be025ef..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# MovingBall
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Tests/MovingBallTests/MovingBallTests.swift b/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Tests/MovingBallTests/MovingBallTests.swift
deleted file mode 100644
index 0997023..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/MovingBall/Tests/MovingBallTests/MovingBallTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import MovingBall
-
-final class MovingBallTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(MovingBall().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/.gitignore b/Examples/SwiftIOPlayground/11MoreProjects/Pong/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/Pong/.gitignore
+++ b/Examples/SwiftIOPlayground/11MoreProjects/Pong/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Package.swift b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Package.swift
index a6f48d0..70269f4 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Package.swift
+++ b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "Pong",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "Pong",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "PongTests",
-            dependencies: ["Pong"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/README.md b/Examples/SwiftIOPlayground/11MoreProjects/Pong/README.md
deleted file mode 100644
index a3457a9..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/Pong/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Pong
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sound/hitball.wav b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Resources/Sounds/hitball.wav
similarity index 100%
rename from Examples/SwiftIOPlayground/11MoreProjects/Pong/Sound/hitball.wav
rename to Examples/SwiftIOPlayground/11MoreProjects/Pong/Resources/Sounds/hitball.wav
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sound/hitwall.wav b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Resources/Sounds/hitwall.wav
similarity index 100%
rename from Examples/SwiftIOPlayground/11MoreProjects/Pong/Sound/hitwall.wav
rename to Examples/SwiftIOPlayground/11MoreProjects/Pong/Resources/Sounds/hitwall.wav
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sound/score.wav b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Resources/Sounds/score.wav
similarity index 100%
rename from Examples/SwiftIOPlayground/11MoreProjects/Pong/Sound/score.wav
rename to Examples/SwiftIOPlayground/11MoreProjects/Pong/Resources/Sounds/score.wav
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sources/Pong/Game.swift b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sources/Pong/Game.swift
index bd6997c..253100d 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sources/Pong/Game.swift
+++ b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Sources/Pong/Game.swift
@@ -66,9 +66,9 @@ struct PongGame {
             screen: screen
         )
 
-        hitBallSound = readSoundData(from: "/SD:/Sound/hitball.wav")
-        hitWallSound = readSoundData(from: "/SD:/Sound/hitwall.wav")
-        scoreSound = readSoundData(from: "/SD:/Sound/score.wav")
+        hitBallSound = readSoundData(from: "/SD:/Resources/Sounds/hitball.wav")
+        hitWallSound = readSoundData(from: "/SD:/Resources/Sounds/hitwall.wav")
+        scoreSound = readSoundData(from: "/SD:/Resources/Sounds/score.wav")
 
         leftPlayer.y = getPaddleY(leftPot)
         rightPlayer.y = getPaddleY(rightPot)
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Tests/PongTests/PongTests.swift b/Examples/SwiftIOPlayground/11MoreProjects/Pong/Tests/PongTests/PongTests.swift
deleted file mode 100644
index 8c1e8b0..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/Pong/Tests/PongTests/PongTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import Pong
-
-final class PongTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(Pong().text, "Hello, World!")
-    }
-}
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/.gitignore b/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/.gitignore
index 3b29812..0023a53 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/.gitignore
+++ b/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/.gitignore
@@ -1,9 +1,8 @@
 .DS_Store
 /.build
 /Packages
-/*.xcodeproj
 xcuserdata/
 DerivedData/
-.swiftpm/config/registries.json
+.swiftpm/configuration/registries.json
 .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
 .netrc
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Package.swift b/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Package.swift
index 2d610e0..275b9da 100644
--- a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Package.swift
+++ b/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Package.swift
@@ -1,6 +1,8 @@
-// swift-tools-version:5.7
+// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
+
 import PackageDescription
+
 let package = Package(
     name: "TicTacToe",
     dependencies: [
@@ -10,18 +12,15 @@ let package = Package(
         .package(url: "https://github.com/madmachineio/MadDrivers.git", branch: "main"),
     ],
     targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
             name: "TicTacToe",
             dependencies: [
                 "SwiftIO",
                 "MadBoards",
-                // use specific library would speed up the compile procedure
-                .product(name: "ST7789", package: "MadDrivers")
+                // Use specific library name rather than "MadDrivers" would speed up the build procedure.
+                .product(name: "ST7789", package: "MadDrivers"),
             ]),
-        .testTarget(
-            name: "TicTacToeTests",
-            dependencies: ["TicTacToe"]),
     ]
 )
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/README.md b/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/README.md
deleted file mode 100644
index d3ec9f4..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/README.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# TicTacToe
-
-A description of this package.
diff --git a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Tests/TicTacToeTests/TicTacToeTests.swift b/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Tests/TicTacToeTests/TicTacToeTests.swift
deleted file mode 100644
index 76be0e0..0000000
--- a/Examples/SwiftIOPlayground/11MoreProjects/TicTacToe/Tests/TicTacToeTests/TicTacToeTests.swift
+++ /dev/null
@@ -1,11 +0,0 @@
-import XCTest
-@testable import TicTacToe
-
-final class TicTacToeTests: XCTestCase {
-    func testExample() throws {
-        // This is an example of a functional test case.
-        // Use XCTAssert and related functions to verify your tests produce the correct
-        // results.
-        XCTAssertEqual(TicTacToe().text, "Hello, World!")
-    }
-}