/*
  Mega analogWrite() test
  This sketch fades LEDs up and down one at a time on digital pins 2 through 13.
  This sketch was written for the Arduino Mega, and will not work on other boards.
  The circuit:
  - LEDs attached from pins 2 through 13 to ground.
  created 8 Feb 2009
  by Tom Igoe
  This example code is in the public domain.
  http://www.arduino.cc/en/Tutorial/AnalogWriteMega
*/

//These constants won't change. They're used to give names to the pins used:
const int lowestPin = 2;
const int highestPin = 13;

void setup(){
  for(int thisPin = lowestPin; thisPin <= highestPin; thisPin++){
    pinMode(thisPin, OUTPUT);
  }
}

void loop(){
  //iterate over the pins:
  for(int thisPin = lowestPin; thisPin <= highestPin; thisPin++){
    //fade the LED on thisPin from off to brightest:
    for (int brightness = 0; brightness < 255; brightness++){
      analogWrite(thisPin, brightness);
      delay(1);
    }
    //fade the LED on thisPin from brightest to off:
    for(int brightness = 255; brightness >= 0; brightness--){
      analogWrite(thisPin, brightness);
      delay(1);
    }
    //pause between LEDs:
    delay(1);
  }
}