Operate/code

/* Fade This example shows how to fade an LED on pin 9 using the analogWrite function. This example code is in the public domain. */

int led = 9;          // the pin that the LED is attached to int brightness = 0;    // how bright the LED is int fadeAmount = 5;    // how many points to fade the LED by

// the setup routine runs once when you press reset: void setup { // declare pin 9 to be an output: pinMode(led, OUTPUT); }

// the loop routine runs over and over again forever: 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); }