diff --git a/ADS1X15.cpp b/ADS1X15.cpp
index 7047512..f772e26 100644
--- a/ADS1X15.cpp
+++ b/ADS1X15.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: ADS1X15.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.13
+// VERSION: 0.4.0
 //    DATE: 2013-03-24
 // PUPROSE: Arduino library for ADS1015 and ADS1115
 //     URL: https://github.com/RobTillaart/ADS1X15
@@ -140,33 +140,8 @@ void ADS1X15::reset()
 }
 
 
-#if defined (ESP8266) || defined(ESP32)
-
-bool ADS1X15::begin(int sda, int scl)
-{
-  _wire->begin(sda, scl);
-  if ((_address < 0x48) || (_address > 0x4B)) return false;
-  if (! isConnected()) return false;
-  return true;
-}
-
-#elif defined (ARDUINO_ARCH_RP2040) && !defined(__MBED__)
-
-bool ADS1X15::begin(int sda, int scl)
-{
-  _wire->setSDA(sda);
-  _wire->setSCL(scl);
-  _wire->begin();
-  if ((_address < 0x48) || (_address > 0x4B)) return false;
-  if (! isConnected()) return false;
-  return true;
-}
-
-#endif
-
 bool ADS1X15::begin()
 {
-  _wire->begin();
   if ((_address < 0x48) || (_address > 0x4B)) return false;
   if (! isConnected()) return false;
   return true;
diff --git a/ADS1X15.h b/ADS1X15.h
index 5019926..4ac801d 100644
--- a/ADS1X15.h
+++ b/ADS1X15.h
@@ -2,7 +2,7 @@
 //
 //    FILE: ADS1X15.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.3.13
+// VERSION: 0.4.0
 //    DATE: 2013-03-24
 // PUPROSE: Arduino library for ADS1015 and ADS1115
 //     URL: https://github.com/RobTillaart/ADS1X15
@@ -12,7 +12,7 @@
 #include "Arduino.h"
 #include "Wire.h"
 
-#define ADS1X15_LIB_VERSION               (F("0.3.13"))
+#define ADS1X15_LIB_VERSION               (F("0.4.0"))
 
 //  allow compile time default address
 //  address in { 0x48, 0x49, 0x4A, 0x4B }, no test...
@@ -36,12 +36,6 @@ class ADS1X15
 public:
   void     reset();
 
-#if defined (ESP8266) || defined(ESP32)
-  bool     begin(int sda, int scl);
-#elif defined (ARDUINO_ARCH_RP2040) && !defined(__MBED__)
-  bool     begin(int sda, int scl);
-#endif
-
   bool     begin();
   bool     isConnected();
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c40a794..0473f7b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,17 +5,22 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 
+## [0.4.0] - 2023-12-06
+- refactor API, begin()
+- update readme.md
+- update examples
+
+----
+
 ## [0.3.13] - 2023-09-20
 - fix #61 ESP32 begin()
 
-
 ## [0.3.12] - 2023-09-11
 - update and add examples
 - add **getLastRequest()** to track last type of measurement.
 - update readme.md
 - minor edits.
 
-
 ## [0.3.11] - 2023-08-31
 - update readme.md
 - move code from .h to .cpp
diff --git a/README.md b/README.md
index c7fa548..2aaed0c 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,15 @@ interesting from functionality point of view as these can also do
 differential measurements.
 
 
+#### 0.4.0 Breaking change
+
+Version 0.4.0 introduced a breaking change.
+You cannot set the pins in **begin()** any more.
+This reduces the dependency of processor dependent Wire implementations.
+The user has to call **Wire.begin()** and can optionally set the Wire pins 
+before calling **begin()**.
+
+
 #### Related
 
 - https://github.com/RobTillaart/MCP_ADC  (10 & 12 bit ADC, SPI, fast)
@@ -445,27 +454,14 @@ mean something different see - Comparator Mode above or datasheet.
 - **int16_t getComparatorThresholdHigh()** reads value from device.
 
 
-## RP2040 specific
-
-- **bool begin(int sda, int scl)** begin communication with the ADC.
-It has the parameter for selecting on which pins the communication should happen.
-Check RP2040 Pinout for compatible pins.
-If, "Wire1" is used, you need to add "&Wire1" in the constructor.
-
-
 ## Future ideas & improvements
 
 #### Must
 
 - Improve documentation (always)
 
-
 #### Should
 
-- investigate of remove the begin(sda, scl) versions 
-  as the responsibility for the Wire configuration 
-  should not be in this library. 
-
 
 #### Could
 
diff --git a/examples/ADS_1114_four/ADS_1114_four.ino b/examples/ADS_1114_four/ADS_1114_four.ino
index 3c4ff15..5fb7da2 100644
--- a/examples/ADS_1114_four/ADS_1114_four.ino
+++ b/examples/ADS_1114_four/ADS_1114_four.ino
@@ -27,6 +27,8 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   for (uint8_t i = 0; i < 4; i++)
   {
     uint8_t address = 0x48 + i;
@@ -36,7 +38,8 @@ void setup()
     Serial.print("  ");
     Serial.println(ADS[i].begin() ? "connected" : "not connected");
 
-    ADS[i].setDataRate(4);        // 0 = slow   4 = medium   7 = fast, but more noise
+    //  0 = slow   4 = medium   7 = fast, but more noise
+    ADS[i].setDataRate(4);
   }
   ADS_request_all();
 }
@@ -44,14 +47,14 @@ void setup()
 
 void loop()
 {
-  // Serial.println(__FUNCTION__);
-  // wait until all is read...
+  //  Serial.println(__FUNCTION__);
+  //  wait until all is read...
   while(ADS_read_all());
 
-  // we have all values, so process (print) them
+  //  we have all values, so process (print) them
   ADS_print_all();
 
-  delay(1000);      // wait a second, comment this line for more samples.
+  delay(1000);      //  wait a second, comment this line for more samples.
   ADS_request_all();
 }
 
@@ -107,4 +110,4 @@ void ADS_print_all()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
diff --git a/examples/ADS_1114_two_continuous/ADS_1114_two_continuous.ino b/examples/ADS_1114_two_continuous/ADS_1114_two_continuous.ino
index fff0ee4..b30dab1 100644
--- a/examples/ADS_1114_two_continuous/ADS_1114_two_continuous.ino
+++ b/examples/ADS_1114_two_continuous/ADS_1114_two_continuous.ino
@@ -27,18 +27,19 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
 
-  // SETUP FIRST ADS1114
+  //  SETUP FIRST ADS1114
   ADS_1.begin();
   ADS_1.setGain(0);         //  0 == 6.144 volt, default
   ADS_1.setDataRate(7);     //  0 = slow   4 = medium   7 = fast
 
-  // SET ALERT RDY PIN
+  //  SET ALERT RDY PIN
   ADS_1.setComparatorThresholdHigh(0x8000);
   ADS_1.setComparatorThresholdLow(0x0000);
   ADS_1.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady_1, RISING);
 
@@ -46,17 +47,17 @@ void setup()
   ADS_1.readADC();          //  0 == default channel,  trigger first read
 
 
-  // SETUP SECOND ADS1114
+  //  SETUP SECOND ADS1114
   ADS_2.begin();
   ADS_2.setGain(0);         //  0 == 6.144 volt, default
   ADS_2.setDataRate(7);     //  7 == highest
 
-  // SET ALERT RDY PIN
+  //  SET ALERT RDY PIN
   ADS_2.setComparatorThresholdHigh(0x8000);
   ADS_2.setComparatorThresholdLow(0x0000);
   ADS_2.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(3, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(3), adsReady_2, RISING);
 
@@ -78,26 +79,26 @@ void loop()
 }
 
 
-// catch interrupt and set flag device 1
+//  catch interrupt and set flag device 1
 void adsReady_1()
 {
   RDY_1 = true;
 }
 
-// catch interrupt and set flag device 1
+//  catch interrupt and set flag device 1
 void adsReady_2()
 {
   RDY_2 = true;
 }
 
 
-// handle conversions that are ready
+//  handle conversions that are ready
 bool handleConversion()
 {
   bool rv = false;
   if (RDY_1)
   {
-    // save the last value
+    //  save the last value
     val_1 = ADS_1.getValue();
     ADS_1.readADC(0);
     RDY_1 = false;
@@ -105,7 +106,7 @@ bool handleConversion()
   }
   if (RDY_2)
   {
-    // save the last value
+    //  save the last value
     val_2 = ADS_2.getValue();
     ADS_2.readADC(0);
     RDY_2 = false;
@@ -115,5 +116,5 @@ bool handleConversion()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_RP2040_WIRE1/ADS_RP2040_WIRE1.ino b/examples/ADS_RP2040_WIRE1/ADS_RP2040_WIRE1.ino
index ba9763b..174e2f2 100644
--- a/examples/ADS_RP2040_WIRE1/ADS_RP2040_WIRE1.ino
+++ b/examples/ADS_RP2040_WIRE1/ADS_RP2040_WIRE1.ino
@@ -4,13 +4,13 @@
 // PURPOSE: read analog input
 //     URL: https://github.com/RobTillaart/ADS1X15
 
-// test
-// connect 1 potmeter
+//  test
+//  connect 1 potentiometer
 //
-// GND ---[   x   ]------ 5V
-//            |
+//  GND ---[   x   ]------ 5V
+//             |
 //
-// measure at x (connect to AIN0).
+//  measure at x (connect to AIN0).
 
 
 #include "ADS1X15.h"
@@ -32,19 +32,24 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
-  ADS.begin(26, 27);   // SDA (Pin 26), SCL(Pin 27)
-  ADS.setGain(0);      // 6.144 volt
-  ADS.setDataRate(7);  // 0 = slow   4 = medium   7 = fast
-  ADS.setMode(0);      // continuous mode
-  ADS.readADC(0);      // first read to trigger
+  //  SDA (Pin 26), SCL(Pin 27)
+  Wire1.begin();
+  Wire1.setSDA(26);
+  Wire1.setSCL(27);
+  
+  ADS.begin();
+  ADS.setGain(0);      //  6.144 volt
+  ADS.setDataRate(7);  //  0 = slow   4 = medium   7 = fast
+  ADS.setMode(0);      //  continuous mode
+  ADS.readADC(0);      //  first read to trigger
 }
 
 
 void loop()
 {
   Serial.println(ADS.getValue());
-  // optional other code here
+  //  optional other code here
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
diff --git a/examples/ADS_async_16_channel/ADS_async_16_channel.ino b/examples/ADS_async_16_channel/ADS_async_16_channel.ino
index da96742..1c3234b 100644
--- a/examples/ADS_async_16_channel/ADS_async_16_channel.ino
+++ b/examples/ADS_async_16_channel/ADS_async_16_channel.ino
@@ -1,9 +1,7 @@
 //
 //    FILE: ADS_async_16_channel.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
 // PURPOSE: demo reading four ADS1115 modules in parallel
-//    DATE: 2021-07-06
 //     URL: https://github.com/RobTillaart/ADS1X15
 
 
@@ -30,6 +28,8 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   for (uint8_t i = 0; i < 4; i++)
   {
     uint8_t address = 0x48 + i;
@@ -39,7 +39,8 @@ void setup()
     Serial.print("  ");
     Serial.println(ADS[i].begin() ? "connected" : "not connected");
 
-    ADS[i].setDataRate(4);  // 0 = slow   4 = medium   7 = fast, but more noise
+    //  0 = slow   4 = medium   7 = fast, but more noise
+    ADS[i].setDataRate(4);
   }
   ADS_request_all();
 }
@@ -47,14 +48,14 @@ void setup()
 
 void loop()
 {
-  // Serial.println(__FUNCTION__);
-  // wait until all is read...
+  //  Serial.println(__FUNCTION__);
+  //  wait until all is read...
   while (ADS_read_all());
 
-  // we have all values
+  //  we have all values
   ADS_print_all();
 
-  delay(1000);      // wait a second.
+  delay(1000);      //  wait a second.
   ADS_request_all();
 }
 
@@ -75,8 +76,8 @@ bool ADS_read_all()
   {
     if (ADS[i].isConnected() && ADS[i].isBusy()) return true;
   }
-  // Serial.print("IDX:\t");
-  // Serial.println(idx);
+  //  Serial.print("IDX:\t");
+  //  Serial.println(idx);
   for (int i = 0; i < 4; i++)
   {
     if (ADS[i].isConnected())
@@ -97,14 +98,14 @@ bool ADS_read_all()
 
 void ADS_print_all()
 {
-  // Serial.println(__FUNCTION__);
-  // TIMESTAMP
+  //  Serial.println(__FUNCTION__);
+  //  TIMESTAMP
   now = millis();
   Serial.print(now - last);
   last = now;
   Serial.println();
 
-  // PRINT ALL VALUES
+  //  PRINT ALL VALUES
   for (int i = 0; i < 4; i++)
   {
     for (int j = 0; j < 4; j++)
@@ -118,5 +119,5 @@ void ADS_print_all()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_async_8_channel/ADS_async_8_channel.ino b/examples/ADS_async_8_channel/ADS_async_8_channel.ino
index 143a053..67b7cbe 100644
--- a/examples/ADS_async_8_channel/ADS_async_8_channel.ino
+++ b/examples/ADS_async_8_channel/ADS_async_8_channel.ino
@@ -2,7 +2,6 @@
 //    FILE: ADS_async_8_channel.ino
 //  AUTHOR: Rob Tillaart
 // PURPOSE: demo reading two ADS1115 modules in parallel
-//    DATE: 2021-07-05
 //     URL: https://github.com/RobTillaart/ADS1X15
 
 
@@ -36,6 +35,8 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS0.begin();
   ADS1.begin();
   //  ADS2.begin();
@@ -46,7 +47,8 @@ void setup()
   //  Serial.println(ADS2.isConnected());
   //  Serial.println(ADS3.isConnected());
 
-  ADS0.setDataRate(4);  // 0 = slow   4 = medium   7 = fast but more noise
+  //  0 = slow   4 = medium   7 = fast but more noise
+  ADS0.setDataRate(4);
   ADS1.setDataRate(4);
   //  ADS2.setDataRate(4);
   //  ADS3.setDataRate(4);
@@ -58,13 +60,14 @@ void setup()
 
 void loop()
 {
-  // wait until all is read...
+  //  wait until all is read...
   while (ADS_read_all());
 
-  // we have all 8 values
+  //  we have all 8 values
   ADS_print_all();
 
-  delay(1000);      // wait a second.
+  //  wait a second.
+  delay(1000);
   ADS_request_all();
 }
 
@@ -106,13 +109,13 @@ void ADS_print_all()
   Serial.println(now - lastTime);
   lastTime = now;
 
-  // PRINT ALL VALUES OF ADC0
+  //  PRINT ALL VALUES OF ADC0
   for (int i = 0; i < 4; i++)
   {
     Serial.print(val0[i]);
     Serial.print("\t");
   }
-  // PRINT ALL VALUES OF ADC1
+  //  PRINT ALL VALUES OF ADC1
   for (int i = 0; i < 4; i++)
   {
     Serial.print(val1[i]);
@@ -135,5 +138,5 @@ void ADS_print_all()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_async_differential/ADS_async_differential.ino b/examples/ADS_async_differential/ADS_async_differential.ino
index ed4c3f8..f5cfdd7 100644
--- a/examples/ADS_async_differential/ADS_async_differential.ino
+++ b/examples/ADS_async_differential/ADS_async_differential.ino
@@ -1,7 +1,6 @@
 //
 //    FILE: ADS_async_differential.ino
 //  AUTHOR: Rob.Tillaart
-// VERSION: 0.1.0
 // PURPOSE: read multiple differential continuously
 //     URL: https://github.com/RobTillaart/ADS1X15
 
@@ -40,15 +39,17 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
-  ADS.setGain(0);        // 6.144 volt
-  ADS.setDataRate(4);    // 0 = slow   4 = medium   7 = fast
+  ADS.setGain(0);        //  6.144 volt
+  ADS.setDataRate(4);    //  0 = slow   4 = medium   7 = fast
 
   // single shot mode
   ADS.setMode(1);
-  // start with first pair
+  //  start with first pair
   pair = 01;
-  // trigger first read
+  //  trigger first read
   ADS.requestADC_Differential_0_1();
 }
 
@@ -69,7 +70,7 @@ void loop()
 }
 
 
-// can be changed to hold other differentials reads too.
+//  can be changed to hold other differentials reads too.
 bool handleConversion()
 {
   if (ADS.isReady())
@@ -82,18 +83,18 @@ bool handleConversion()
       return false;  // only one done
     }
 
-    // last of series to check
+    //  last of series to check
     if (pair == 23)
     {
       val_23 = ADS.getValue();
       pair = 01;
       ADS.requestADC_Differential_0_1();
-      return true;   // both are updated
+      return true;   //  both are updated
     }
   }
-  return false;  // default not all read
+  return false;      //  default not all read
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_continuous/ADS_continuous.ino b/examples/ADS_continuous/ADS_continuous.ino
index 78a4b43..71b85cd 100644
--- a/examples/ADS_continuous/ADS_continuous.ino
+++ b/examples/ADS_continuous/ADS_continuous.ino
@@ -40,6 +40,8 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
   ADS.setGain(0);      //  6.144 volt
   ADS.setDataRate(7);  //  0 = slow   4 = medium   7 = fast
diff --git a/examples/ADS_continuous_3_channel/ADS_continuous_3_channel.ino b/examples/ADS_continuous_3_channel/ADS_continuous_3_channel.ino
index 4ea3e79..c8a81f2 100644
--- a/examples/ADS_continuous_3_channel/ADS_continuous_3_channel.ino
+++ b/examples/ADS_continuous_3_channel/ADS_continuous_3_channel.ino
@@ -52,18 +52,19 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
   Wire.setClock(400000);
 
   ADS.begin();
-  ADS.setGain(0);        // 6.144 volt
-  ADS.setDataRate(7);    // 0 = slow   4 = medium   7 = fast
+  ADS.setGain(0);        //  6.144 volt
+  ADS.setDataRate(7);    //  0 = slow   4 = medium   7 = fast
 
-  // SET ALERT RDY PIN
+  //  SET ALERT RDY PIN
   ADS.setComparatorThresholdHigh(0x8000);
   ADS.setComparatorThresholdLow(0x0000);
   ADS.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady, RISING);
 
@@ -81,7 +82,7 @@ void loop()
   {
     SPS++;
     val[channel] = ADS.getValue();
-    // request next channel asap
+    //  request next channel asap
     channel++;
     if (channel >= 3) channel = 0;
     ADS.requestADC(channel);
diff --git a/examples/ADS_continuous_4_channel/ADS_continuous_4_channel.ino b/examples/ADS_continuous_4_channel/ADS_continuous_4_channel.ino
index 84d9e89..f95281d 100644
--- a/examples/ADS_continuous_4_channel/ADS_continuous_4_channel.ino
+++ b/examples/ADS_continuous_4_channel/ADS_continuous_4_channel.ino
@@ -41,24 +41,26 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady, RISING);
 
   ADS.begin();
-  ADS.setGain(0);        // 6.144 volt
-  ADS.setDataRate(7);    // 0 = slow   4 = medium   7 = fast
+  ADS.setGain(0);        //  6.144 volt
+  ADS.setDataRate(7);    //  0 = slow   4 = medium   7 = fast
 
-  // SET ALERT RDY PIN
+  //  SET ALERT RDY PIN
   ADS.setComparatorThresholdHigh(0x8000);
   ADS.setComparatorThresholdLow(0x0000);
   ADS.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady, RISING);
 
-  ADS.setMode(0);        // continuous mode
-  ADS.readADC(channel);     // trigger first read
+  ADS.setMode(0);        //  continuous mode
+  ADS.readADC(channel);  //  trigger first read
 }
 
 
@@ -89,9 +91,9 @@ void handleConversion()
 {
   if (RDY)
   {
-    // save the value
+    //  save the value
     val[channel] = ADS.getValue();
-    // request next channel
+    //  request next channel
     channel++;
     if (channel >= 4) channel = 0;
     ADS.readADC(channel);
@@ -100,5 +102,5 @@ void handleConversion()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_continuous_8_channel/ADS_continuous_8_channel.ino b/examples/ADS_continuous_8_channel/ADS_continuous_8_channel.ino
index a7c0f40..5bea470 100644
--- a/examples/ADS_continuous_8_channel/ADS_continuous_8_channel.ino
+++ b/examples/ADS_continuous_8_channel/ADS_continuous_8_channel.ino
@@ -21,7 +21,7 @@
 #include "ADS1X15.h"
 
 
-// adjust addresses if needed
+//  adjust addresses if needed
 ADS1115 ADS_1(0x49);
 ADS1115 ADS_2(0x48);
 
@@ -29,8 +29,8 @@ ADS1115 ADS_2(0x48);
 volatile bool RDY_1 = false;
 volatile bool RDY_2 = false;
 
-uint8_t channel_1 = 0;         // channel from device 1
-uint8_t channel_2 = 0;         // channel from device 2
+uint8_t channel_1 = 0;         //  channel from device 1
+uint8_t channel_2 = 0;         //  channel from device 2
 
 //  array to hold the data.
 int16_t val[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
@@ -43,40 +43,42 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
-  // SETUP FIRST ADS1115
+  Wire.begin();
+
+  //  SETUP FIRST ADS1115
   ADS_1.begin();
-  ADS_1.setGain(0);        // 6.144 volt
-  ADS_1.setDataRate(7);    // 0 = slow   4 = medium   7 = fast
+  ADS_1.setGain(0);        //  6.144 volt
+  ADS_1.setDataRate(7);    //  0 = slow   4 = medium   7 = fast
 
-  // SET ALERT RDY PIN
+  //  SET ALERT RDY PIN
   ADS_1.setComparatorThresholdHigh(0x8000);
   ADS_1.setComparatorThresholdLow(0x0000);
   ADS_1.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady_1, RISING);
 
-  ADS_1.setMode(0);          // continuous mode
-  ADS_1.readADC(channel_1);  // trigger first read
+  ADS_1.setMode(0);          //  continuous mode
+  ADS_1.readADC(channel_1);  //  trigger first read
 
 
-  // SETUP SECOND ADS1115
+  //  SETUP SECOND ADS1115
   ADS_2.begin();
-  ADS_2.setGain(0);        // 6.144 volt
+  ADS_2.setGain(0);          //  6.144 volt
   ADS_2.setDataRate(7);
 
-  // SET ALERT RDY PIN
+  //  SET ALERT RDY PIN
   ADS_2.setComparatorThresholdHigh(0x8000);
   ADS_2.setComparatorThresholdLow(0x0000);
   ADS_2.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(3, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(3), adsReady_2, RISING);
 
-  ADS_2.setMode(0);          // continuous mode
-  ADS_2.readADC(channel_2);  // trigger first read
+  ADS_2.setMode(0);          //  continuous mode
+  ADS_2.readADC(channel_2);  //  trigger first read
 }
 
 
@@ -95,28 +97,28 @@ void loop()
 }
 
 
-// catch interrupt and set flag device 1
+//  catch interrupt and set flag device 1
 void adsReady_1()
 {
   RDY_1 = true;
 }
 
-// catch interrupt and set flag device 1
+//  catch interrupt and set flag device 1
 void adsReady_2()
 {
   RDY_2 = true;
 }
 
 
-// handle conversions that are ready
+//  handle conversions that are ready
 bool handleConversion()
 {
   bool rv = false;
   if (RDY_1)
   {
-    // save the last value
+    //  save the last value
     val[channel_1] = ADS_1.getValue();
-    // request next channel
+    //  request next channel
     channel_1++;
     if (channel_1 >= 4) channel_1 = 0;
     ADS_1.readADC(channel_1);
@@ -125,9 +127,9 @@ bool handleConversion()
   }
   if (RDY_2)
   {
-    // save the last value
+    //  save the last value
     val[4 + channel_2] = ADS_2.getValue();
-    // request next channel
+    //  request next channel
     channel_2++;
     if (channel_2 >= 4) channel_2 = 0;
     ADS_2.readADC(channel_2);
@@ -138,5 +140,5 @@ bool handleConversion()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_continuous_differential/ADS_continuous_differential.ino b/examples/ADS_continuous_differential/ADS_continuous_differential.ino
index 8954434..d19968b 100644
--- a/examples/ADS_continuous_differential/ADS_continuous_differential.ino
+++ b/examples/ADS_continuous_differential/ADS_continuous_differential.ino
@@ -28,11 +28,11 @@
 ADS1115 ADS(0x48);
 
 
-// interrupt flag
+//  interrupt flag
 volatile bool RDY = false;
-// which pair to use for differential
+//  which pair to use for differential
 uint8_t pair = 01;
-// two values to hold differential measurements.
+//  two values to hold differential measurements.
 int16_t val_01 = 0;
 int16_t val_23 = 0;
 
@@ -44,29 +44,31 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  Wire.begin();
+
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady, RISING);
 
   ADS.begin();
   Serial.print("connected: ");
   Serial.println(ADS.isConnected());
-  ADS.setGain(0);        // 6.144 volt
-  ADS.setDataRate(0);    // 0 = slow   4 = medium   7 = fast  (7 = fails )
-  // every step is about a factor 2 slower.
+  ADS.setGain(0);        //  6.144 volt
+  ADS.setDataRate(0);    //  0 = slow   4 = medium   7 = fast  (7 = fails )
+  //  every step is about a factor 2 slower.
 
-  // SET ALERT RDY PIN (QueConvert mode)
-  // set the MSB of the Hi_thresh register to 1
+  //  SET ALERT RDY PIN (QueConvert mode)
+  //  set the MSB of the Hi_thresh register to 1
   ADS.setComparatorThresholdHigh(0x8000);
-  // set the MSB of the Lo_thresh register to 0
+  //  set the MSB of the Lo_thresh register to 0
   ADS.setComparatorThresholdLow(0x0000);
   ADS.setComparatorQueConvert(0);
 
-  // continuous mode
+  //  continuous mode
   ADS.setMode(0);
-  // start with first pair
+  //  start with first pair
   pair = 01;
-  // trigger first read
+  //  trigger first read
   ADS.requestADC_Differential_0_1();
 }
 
@@ -86,19 +88,19 @@ void loop()
     Serial.println();
   }
 
-  // do other stuff here
-  // delay(10);
+  //  do other stuff here
+  //  delay(10);
 }
 
 
-// interrupt handler, sets the RDY flag
+//  interrupt handler, sets the RDY flag
 void adsReady()
 {
   RDY = true;
 }
 
 
-// can be changed to hold other differentials or normal reads too.
+//  can be changed to hold other differentials or normal reads too.
 bool handleConversion()
 {
   if (RDY)
@@ -109,21 +111,21 @@ bool handleConversion()
       val_01 = ADS.getValue();
       pair = 23;
       ADS.requestADC_Differential_2_3();
-      return false;  // only one done
+      return false;  //  only one done
     }
 
-    // last of series to check
+    //  last of series to check
     if (pair == 23)
     {
       val_23 = ADS.getValue();
       pair = 01;
       ADS.requestADC_Differential_0_1();
-      return true;   // both are updated
+      return true;   //  both are updated
     }
   }
-  return false;  // default not all read
+  return false;      //  default not all read
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_differential/ADS_differential.ino b/examples/ADS_differential/ADS_differential.ino
index 243233e..546ce4a 100644
--- a/examples/ADS_differential/ADS_differential.ino
+++ b/examples/ADS_differential/ADS_differential.ino
@@ -38,6 +38,8 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
   ADS.setGain(0);
 }
@@ -64,5 +66,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_high_speed_differential/ADS_high_speed_differential.ino b/examples/ADS_high_speed_differential/ADS_high_speed_differential.ino
index 4a618fb..f83b6e3 100644
--- a/examples/ADS_high_speed_differential/ADS_high_speed_differential.ino
+++ b/examples/ADS_high_speed_differential/ADS_high_speed_differential.ino
@@ -17,7 +17,7 @@
 
 #include "ADS1X15.h"
 
-// adjust addresses if needed
+//  adjust addresses if needed
 ADS1115 ADS_1(0x49);
 ADS1115 ADS_2(0x48);
 
@@ -34,43 +34,45 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
-  // SETUP FIRST ADS1115
+  Wire.begin();
+
+  //  SETUP FIRST ADS1115
   ADS_1.begin();
-  ADS_1.setGain(0);        // 6.144 volt
-  ADS_1.setDataRate(7);    // 0 = slow   4 = medium   7 = fast
+  ADS_1.setGain(0);        //  6.144 volt
+  ADS_1.setDataRate(7);    //  0 = slow   4 = medium   7 = fast
 
-  // SET ALERT RDY PIN (QueConvert mode)
-  // set the MSB of the Hi_thresh register to 1
+  //  SET ALERT RDY PIN (QueConvert mode)
+  //  set the MSB of the Hi_thresh register to 1
   ADS_1.setComparatorThresholdHigh(0x8000);
   // set the MSB of the Lo_thresh register to 0
   ADS_1.setComparatorThresholdLow(0x0000);
   ADS_1.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(2, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(2), adsReady_1, RISING);
 
-  ADS_1.setMode(0);          // continuous mode
-  ADS_1.readADC(channel);    // trigger first read
+  ADS_1.setMode(0);          //  continuous mode
+  ADS_1.readADC(channel);    //  trigger first read
 
 
-  // SETUP SECOND ADS1115
+  //  SETUP SECOND ADS1115
   ADS_2.begin();
-  ADS_2.setGain(0);        // 6.144 volt
+  ADS_2.setGain(0);          //  6.144 volt
   ADS_2.setDataRate(7);
 
-  // SET ALERT RDY PIN
-  // set the MSB of the Hi_thresh register to 1
+  //  SET ALERT RDY PIN
+  //  set the MSB of the Hi_thresh register to 1
   ADS_2.setComparatorThresholdHigh(0x8000);
   // set the MSB of the Lo_thresh register to 0
   ADS_2.setComparatorThresholdLow(0x0000);
   ADS_2.setComparatorQueConvert(0);
 
-  // SET INTERRUPT HANDLER TO CATCH CONVERSION READY
+  //  SET INTERRUPT HANDLER TO CATCH CONVERSION READY
   pinMode(3, INPUT_PULLUP);
   attachInterrupt(digitalPinToInterrupt(3), adsReady_2, RISING);
 
-  ADS_2.setMode(0);          // continuous mode
+  ADS_2.setMode(0);          //  continuous mode
   ADS_2.readADC(channel);    // trigger first read
 }
 
@@ -89,7 +91,7 @@ void loop()
 }
 
 
-// catch interrupt and set flag
+//  catch interrupt and set flag
 void adsReady_1()
 {
   RDY_1 = true;
@@ -101,7 +103,7 @@ void adsReady_2()
 }
 
 
-// handle conversions if both are ready
+//  handle conversions if both are ready
 bool handleConversion()
 {
   if (RDY_1 == false) return false;
@@ -123,5 +125,5 @@ bool handleConversion()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_minimum/ADS_minimum.ino b/examples/ADS_minimum/ADS_minimum.ino
index 67e01ce..021df49 100644
--- a/examples/ADS_minimum/ADS_minimum.ino
+++ b/examples/ADS_minimum/ADS_minimum.ino
@@ -35,6 +35,8 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
   ADS.setGain(0);  // 6.144 volt
   Serial.println("Voltage");
@@ -48,5 +50,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_performance/ADS_performance.ino b/examples/ADS_performance/ADS_performance.ino
index b2d1a4c..a781d81 100644
--- a/examples/ADS_performance/ADS_performance.ino
+++ b/examples/ADS_performance/ADS_performance.ino
@@ -38,10 +38,10 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
-  ADS.begin();
-
+  Wire.begin();
   Wire.setClock(100000);
 
+  ADS.begin();
   ADS.setGain(0);  // 6.144 volt
 
   for (int dr = 0; dr < 8; dr++)
diff --git a/examples/ADS_pointerToFunction/ADS_pointerToFunction.ino b/examples/ADS_pointerToFunction/ADS_pointerToFunction.ino
index b8ea6fa..744ec19 100644
--- a/examples/ADS_pointerToFunction/ADS_pointerToFunction.ino
+++ b/examples/ADS_pointerToFunction/ADS_pointerToFunction.ino
@@ -23,6 +23,9 @@ void setup()
   while(!Serial);
   Serial.println(__FILE__);
 
+  Wire.begin();
+  Wire.setClock(100000);
+
   ADS.begin();  //  use defaults
   
   readADC = analogRead;  //  start with internal 
@@ -45,4 +48,4 @@ int wrapper(uint8_t x)
 
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
diff --git a/examples/ADS_read/ADS_read.ino b/examples/ADS_read/ADS_read.ino
index 249c68b..32c1f00 100644
--- a/examples/ADS_read/ADS_read.ino
+++ b/examples/ADS_read/ADS_read.ino
@@ -26,6 +26,7 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
   ADS.begin();
 }
 
@@ -51,5 +52,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_read_RDY/ADS_read_RDY.ino b/examples/ADS_read_RDY/ADS_read_RDY.ino
index 7e17aab..2b9d1f4 100644
--- a/examples/ADS_read_RDY/ADS_read_RDY.ino
+++ b/examples/ADS_read_RDY/ADS_read_RDY.ino
@@ -4,18 +4,18 @@
 // PURPOSE: read analog inputs - straightforward.
 //     URL: https://github.com/RobTillaart/ADS1X15
 
-// test
-// connect 1 potmeter per port.
+//  test
+//  connect 1 potentiometer per port.
 //
-// GND ---[   x   ]------ 5V
-//            |
+//  GND ---[   x   ]------ 5V
+//             |
 //
-// measure at x (connect to AIN0).
+//  measure at x (connect to AIN0).
 //
 
-// EXPERIMENTAL
+//  EXPERIMENTAL
 //
-// The RDY pin (or ALERT Pin) is triggered when conversion is ready
+//  The RDY pin (or ALERT Pin) is triggered when conversion is ready
 //
 
 
@@ -31,16 +31,18 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
-  ADS.setGain(0);      // 6.144 volt
-  ADS.setDataRate(7);  // 0 = slow   4 = medium   7 = fast
-  ADS.setMode(1);      // continuous mode
-  ADS.readADC(0);      // first read to trigger
+  ADS.setGain(0);      //  6.144 volt
+  ADS.setDataRate(7);  //  0 = slow   4 = medium   7 = fast
+  ADS.setMode(1);      //  continuous mode
+  ADS.readADC(0);      //  first read to trigger
   
-  // set the thresholds to Trigger RDY pin
+  //  set the thresholds to Trigger RDY pin
   ADS.setComparatorThresholdLow(0x0000);
   ADS.setComparatorThresholdHigh(0x0200);
-  ADS.setComparatorQueConvert(0);             // enable RDY pin !!
+  ADS.setComparatorQueConvert(0);             //  enable RDY pin !!
   ADS.setComparatorLatch(0);
 }
 
@@ -51,7 +53,7 @@ void loop()
 
   int16_t val_0 = ADS.readADC(0);
 
-  float f = ADS.toVoltage(1);   // voltage factor
+  float f = ADS.toVoltage(1);   //  voltage factor
 
   Serial.print("\tAnalog0: ");
   Serial.print(val_0);
@@ -62,5 +64,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_read_async/ADS_read_async.ino b/examples/ADS_read_async/ADS_read_async.ino
index 23a4f36..e32ec7d 100644
--- a/examples/ADS_read_async/ADS_read_async.ino
+++ b/examples/ADS_read_async/ADS_read_async.ino
@@ -27,9 +27,11 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
   ADS.setGain(0);
-  f = ADS.toVoltage();      // voltage factor
+  f = ADS.toVoltage();      //  voltage factor
   ADS.requestADC(0);
 }
 
@@ -39,16 +41,17 @@ void loop()
   if (ADS.isBusy() == false)
   {
     int16_t val_0 = ADS.getValue();
-    ADS.requestADC(0);  // request a new one
+    //  request a new one
+    ADS.requestADC(0);
     Serial.print("\tAnalog0: ");
     Serial.print(val_0);
     Serial.print('\t');
     Serial.println(val_0 * f, 3);
   }
-  // simulate other tasks...
+  //  simulate other tasks...
   delay(2000);
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_read_async_rdy/ADS_read_async_rdy.ino b/examples/ADS_read_async_rdy/ADS_read_async_rdy.ino
index 48ca367..5b1a47a 100644
--- a/examples/ADS_read_async_rdy/ADS_read_async_rdy.ino
+++ b/examples/ADS_read_async_rdy/ADS_read_async_rdy.ino
@@ -32,17 +32,20 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
-  ADS.setGain(0);      // 6.144 volt
-  // select slow so the led blinks visible for the eye.
-  ADS.setDataRate(0);  // 0 = slow   4 = medium   7 = fast
-  f = ADS.toVoltage(); // voltage factor
+  ADS.setGain(0);      //  6.144 volt
+  
+  //  select slow so the led blinks visible for the eye.
+  ADS.setDataRate(0);  //  0 = slow   4 = medium   7 = fast
+  f = ADS.toVoltage(); //  voltage factor
   ADS.requestADC(0);
   
-  // set the thresholds to Trigger RDY pin
+  //  set the thresholds to Trigger RDY pin
   ADS.setComparatorThresholdLow(0x0000);
   ADS.setComparatorThresholdHigh(0x0200);
-  ADS.setComparatorQueConvert(0);             // enable RDY pin !!
+  ADS.setComparatorQueConvert(0);             //  enable RDY pin !!
   ADS.setComparatorLatch(0);
 }
 
@@ -52,16 +55,17 @@ void loop()
   if (ADS.isReady())
   {
     int16_t val_0 = ADS.getValue();
-    ADS.requestADC(0);  // request a new one
+    //  request a new one
+    ADS.requestADC(0);
     Serial.print("\tAnalog0: ");
     Serial.print(val_0);
     Serial.print('\t');
     Serial.println(val_0 * f, 3);
   }
-  // simulate other tasks...
+  //  simulate other tasks...
   delay(2000);
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_read_comparator_1/ADS_read_comparator_1.ino b/examples/ADS_read_comparator_1/ADS_read_comparator_1.ino
index bdd9365..d1e31b2 100644
--- a/examples/ADS_read_comparator_1/ADS_read_comparator_1.ino
+++ b/examples/ADS_read_comparator_1/ADS_read_comparator_1.ino
@@ -32,26 +32,28 @@ void setup()
   Serial.print("ADS1X15_LIB_VERSION: ");
   Serial.println(ADS1X15_LIB_VERSION);
 
+  Wire.begin();
+
   ADS.begin();
 
-  // change if needed.
-  ADS.setComparatorMode(1);              // 0 = TRADITIONAL    1 = WINDOW
+  //  change if needed.
+  ADS.setComparatorMode(1);              //  0 = TRADITIONAL    1 = WINDOW
 
-  ADS.setComparatorPolarity(0);          // 0 = LOW (default)  1 = HIGH
+  ADS.setComparatorPolarity(0);          //  0 = LOW (default)  1 = HIGH
   
-  // note NON-LATCH gives only a short pulse
-  ADS.setComparatorLatch(1);             // 0 = NON LATCH      1 = LATCH
+  //  note NON-LATCH gives only a short pulse
+  ADS.setComparatorLatch(1);             //  0 = NON LATCH      1 = LATCH
 
-  ADS.setComparatorQueConvert(0);        // 0 = trigger alert after 1 conversion
+  ADS.setComparatorQueConvert(0);        //  0 = trigger alert after 1 conversion
 
-  // set the thresholds as a number...
-  // ADS.setComparatorThresholdLow(5000);   // change if needed
-  // ADS.setComparatorThresholdHigh(20000); // change if needed
+  //  set the thresholds as a number...
+  //  ADS.setComparatorThresholdLow(5000);   //  change if needed
+  //  ADS.setComparatorThresholdHigh(20000); //  change if needed
 
-  // set the threshold as a voltage by using the voltage factor.
-  float f = ADS.toVoltage(1);  // voltage factor
-  ADS.setComparatorThresholdLow(1.234 / f);   // convert volts to number needed
-  ADS.setComparatorThresholdHigh(3.142 / f);  // convert volts to number needed
+  //  set the threshold as a voltage by using the voltage factor.
+  float f = ADS.toVoltage(1);  //  voltage factor
+  ADS.setComparatorThresholdLow(1.234 / f);   //  convert volts to number needed
+  ADS.setComparatorThresholdHigh(3.142 / f);  //  convert volts to number needed
   
   Serial.println(ADS.getComparatorThresholdLow());
   Serial.println(ADS.getComparatorThresholdHigh());
@@ -64,7 +66,7 @@ void loop()
 
   int16_t val_0 = ADS.readADC(0);
 
-  float f = ADS.toVoltage(1);  // voltage factor
+  float f = ADS.toVoltage(1);  //  voltage factor
 
   Serial.print("\tAnalog0: ");
   Serial.print(val_0);
@@ -80,5 +82,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/examples/ADS_setWireClock/ADS_setWireClock.ino b/examples/ADS_setWireClock/ADS_setWireClock.ino
index cfc2da0..1608db2 100644
--- a/examples/ADS_setWireClock/ADS_setWireClock.ino
+++ b/examples/ADS_setWireClock/ADS_setWireClock.ino
@@ -4,13 +4,13 @@
 // PURPOSE: read analog inputs - straightforward.
 //     URL: https://github.com/RobTillaart/ADS1X15
 
-// test
-// connect 1 potmeter per port.
+//  test
+//  connect 1 potentiometer per port.
 //
-// GND ---[   x   ]------ 5V
-//            |
+//  GND ---[   x   ]------ 5V
+//             |
 //
-// measure at x (connect to AIN0).
+//  measure at x (connect to AIN0).
 //
 
 
@@ -50,7 +50,7 @@ void loop()
   int16_t val_2 = ADS.readADC(2);
   int16_t val_3 = ADS.readADC(3);
 
-  float f = ADS.toVoltage(1);  // voltage factor
+  float f = ADS.toVoltage(1);  //  voltage factor
 
   Serial.print("\tAnalog0: "); Serial.print(val_0); Serial.print('\t'); Serial.println(val_0 * f, 3);
   Serial.print("\tAnalog1: "); Serial.print(val_1); Serial.print('\t'); Serial.println(val_1 * f, 3);
@@ -62,5 +62,5 @@ void loop()
 }
 
 
-// -- END OF FILE --
+//  -- END OF FILE --
 
diff --git a/library.json b/library.json
index 496f30b..1e19778 100644
--- a/library.json
+++ b/library.json
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/ADS1X15"
   },
-  "version": "0.3.13",
+  "version": "0.4.0",
   "license": "MIT",
   "frameworks": "*",
   "platforms": "*",
diff --git a/library.properties b/library.properties
index ec84b7d..821fdf2 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=ADS1X15
-version=0.3.13
+version=0.4.0
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for ADS1015 - I2C 12 bit ADC and ADS1115 I2C 16 bit ADC
diff --git a/test/unit_test_001.cpp b/test/unit_test_001.cpp
index 5f0a395..6df7781 100644
--- a/test/unit_test_001.cpp
+++ b/test/unit_test_001.cpp
@@ -27,6 +27,7 @@
 
 unittest_setup()
 {
+  fprintf(stderr, "ADS1X15_LIB_VERSION: %s\n", (char *) ADS1X15_LIB_VERSION);
 }
 
 
@@ -37,8 +38,6 @@ unittest_teardown()
 
 unittest(test_constants)
 {
-  fprintf(stderr, "ADS1X15_LIB_VERSION: %s\n", (char *) ADS1X15_LIB_VERSION);
-
   assertEqual(0x48, ADS1015_ADDRESS);
   assertEqual(0x48, ADS1115_ADDRESS);
   assertEqual(   0, ADS1X15_OK);
@@ -51,6 +50,9 @@ unittest(test_constants)
 unittest(test_begin)
 {
   ADS1115 ADS(0x48);
+
+  Wire.begin();
+
   assertTrue(ADS.begin());
   assertTrue(ADS.isConnected());
   assertTrue(ADS.isBusy());
@@ -60,6 +62,9 @@ unittest(test_begin)
 unittest(test_gain)
 {
   ADS1115 ADS(0x48);
+
+  Wire.begin();
+
   assertTrue(ADS.begin());
 
   assertEqual(0, ADS.getGain());
@@ -78,6 +83,9 @@ unittest(test_gain)
 unittest(test_Voltage)
 {
   ADS1115 ADS(0x48);
+
+  Wire.begin();
+
   assertTrue(ADS.begin());
 
   // should test all values?
@@ -96,4 +104,5 @@ unittest(test_Voltage)
 unittest_main()
 
 
-// --------
+//  -- END OF FILE --
+