Added a version of the fant hub firmware where it is default off

platformio.ini

@@ -76,3 +76,13 @@ build_src_filter =
     +<*.hpp>
     -<examples/**>
     +<examples/fan_hub/*>
+
+[env:teensy40_fan_hub_default_off]
+extends = env:teensy40
+build_src_filter =
+    +<*.c>
+    +<*.h>
+    +<*.cpp>
+    +<*.hpp>
+    -<examples/**>
+    +<examples/fan_hub_default_off/*>

src/examples/fan_hub_default_off/fan_hub.cpp

@@ -0,0 +1,66 @@
+/* A small demo to show how the teensy-to-any can be used to control 4 pin fans.
+ * It is assumed that the fan PWM pin is connected to pin 2
+ * and that an indicator LED is connected to Pin 13 (this is the default board)
+ *
+ * The demo code will run the fan at
+ *  * 100%
+ *  * 75%
+ *  * 50%
+ *  * 25%
+ *  * 0%
+ * For 3 seconds at a time and then continue in an infinite loop.
+ * The LED can be used as a visual guide of the expected speed of the fan.
+ *
+ * Not all fan will be able to operate at 25% duty cyle.
+ *
+ * Ramona Optics - 2024
+ */
+const char *teensy_to_any_startup_commands[] = {
+    // Setup the LED as an indicator pin
+    "gpio_pin_mode 13 OUTPUT 1",
+    // Setup pin 2 as the PWM control pin
+    "gpio_pin_mode 2 OUTPUT 1",
+    // Set the frequency to 25 kHz
+    "analog_write_frequency 2 25000",
+    // Also setup the LED to tell us what is going on.
+    "analog_write_frequency 13 25000",
+    "analog_write 2 0",
+    "analog_write 13 0",
+    nullptr,
+};
+
+// Change the fan speed
+const char *teensy_to_any_demo_commands[] = {
+    // "analog_write 2 255",
+    // "analog_write 13 255",
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+
+    // "analog_write 2 192",
+    //  // Brightness is a strange thing, and does not
+    //  // decrease so linearly according to human perception
+    // "analog_write 13 128",
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+
+    // "analog_write 2 128",
+    // "analog_write 13 30",
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+
+    // "analog_write 2 64",
+    // "analog_write 13 10",
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+
+    // "analog_write 2 0",
+    // "analog_write 13 0",
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    // "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", "sleep 0.2", // 1000 ms
+    nullptr,
+};