| LED Fade by BARRAGAN <http://barraganstudio.com> Demonstrates the use of PWM pins (analog output) by dimming a light (LED) from off to maximum intensity and back. Created 5 February 2004 Revised 26 January 2008 |

    // LED Fade
    // by BARRAGAN <http://barraganstudio.com>

    int value = 0;                            // variable to keep the actual value
    int ledpin = 0;                           // light connected to analog pin 0

    void setup()
    {
      // nothing for setup
    }

    void loop()
    {
      for(value = 0 ; value <= 1023; value+=5) // fade in (from min to max)
      {
        analogWrite(ledpin, value);           // sets the value (range from 0 to 1023)
        delay(30);                            // waits for 30 milli seconds to see the dimming effect
      }
      for(value = 1023; value >=0; value-=5)   // fade out (from max to min)
      {
        analogWrite(ledpin, value);
        delay(30);
      }
    }