initial commit

PMWFrequency/PWMFrequency.ino

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+/*
+  Fade
+
+  This example shows how to fade an LED on pin 9
+  using the analogWrite() function.
+
+  The analogWrite() function uses PWM, so if
+  you want to change the pin you're using, be
+  sure to use another PWM capable pin. On most
+  Arduino, the PWM pins are identified with
+  a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.
+
+  This example code is in the public domain.
+*/
+
+//
+// =======================================================================================================
+// INCLUDE LIRBARIES
+// =======================================================================================================
+//
+
+#include <PWMFrequency.h> // https://github.com/TheDIYGuy999/PWMFrequency
+
+//
+// =======================================================================================================
+// PIN ASSIGNMENTS & GLOBAL VARIABLES
+// =======================================================================================================
+//
+
+int led = 9;           // the PWM pin the LED is attached to
+int brightness = 0;    // how bright the LED is
+int fadeAmount = 5;    // how many points to fade the LED by
+
+///
+// =======================================================================================================
+// MAIN ARDUINO SETUP (1x during startup)
+// =======================================================================================================
+//
+
+void setup() {
+  // declare pin 9 to be an output:
+  pinMode(led, OUTPUT);
+
+  // PWM frequency: 32 = 984Hz (default), 8 = 3936Hz, 1 = 31488Hz
+  setPWMPrescaler(9, 1);
+}
+
+//
+// =======================================================================================================
+// MAIN LOOP
+// =======================================================================================================
+//
+
+void loop() {
+  // set the brightness of pin 9:
+  analogWrite(led, brightness);
+
+  // change the brightness for next time through the loop:
+  brightness = brightness + fadeAmount;
+
+  // reverse the direction of the fading at the ends of the fade:
+  if (brightness == 0 || brightness == 255) {
+    fadeAmount = -fadeAmount ;
+  }
+  // wait for 30 milliseconds to see the dimming effect
+  delay(30);
+}