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This sketch makes an LED connected to Arduino pin 9 to fade on and off
int led = 9; // the pin that the LED is attached to
int brightness = 0; // the bigger this number, the brighter the LED is
int fadeAmount = 5; // the bigger this number, the faster the the LED will fade on or off
// the setup routine runs once when you press reset:
void setup() {
pinMode(led, OUTPUT); // declare pin 9 to be an output:
// the loop routine runs over and over again forever:
void loop() {
analogWrite(led, brightness); // set the brightness of pin 9:
// 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 10 milliseconds to see the dimming effect
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