Fade Arduino Sketch

This is a standard Arduino example sketch, copied here for reference.

Full Source Code

The full code is all in one file Fade.ino.

 1/*
 2 Fade
 3
 4 This example shows how to fade an LED on pin 9
 5 using the analogWrite() function.
 6
 7 This example code is in the public domain.
 8 */
 9
10int led = 9;           // the pin that the LED is attached to
11int brightness = 0;    // how bright the LED is
12int fadeAmount = 5;    // how many points to fade the LED by
13
14// the setup routine runs once when you press reset:
15void setup() {
16  // declare pin 9 to be an output:
17  pinMode(led, OUTPUT);
18}
19
20// the loop routine runs over and over again forever:
21void loop() {
22  // set the brightness of pin 9:
23  analogWrite(led, brightness);
24
25  // change the brightness for next time through the loop:
26  brightness = brightness + fadeAmount;
27
28  // reverse the direction of the fading at the ends of the fade:
29  if (brightness == 0 || brightness == 255) {
30    fadeAmount = -fadeAmount ;
31  }
32  // wait for 30 milliseconds to see the dimming effect
33  delay(30);
34}