/*
Fade
This example shows how to fade an LED on pin 10
using the analogWrite() function.
This example code is in the public domain.
*/
int led = 10; // 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

void setup() {
  // declare pin 10 to be an output: 
  pinMode (led, OUTPUT);

}

void loop() {
 // set the brightness of pin 10:
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 40 milliseconds to see the dimming effect
delay (40);

}