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); 
  }  
}