// Fading LEDs 2 
// by Paul Maddox (http://www.Vacoloco.net) an extension of the single LED fading
//  program by BARRAGAN <http://people.interaction-ivrea.it/h.barragan> 
// and was inspired by TodBots spooky arduino project 3, the Ambient Orb
//  I wanted to do a similar thing but without the PC attached
//
// This code fades 3 LEDs in and out, 120 degrees our of phase,
//  If you make the LEDs Red, Green and Blue you'll get a psychadelic colour change.
//

#define TOP 90                    // tweak 'TOP' value dependant on brightness of LED
#define BOTTOM 5                  // sets how low to go, should be above zero!

int value = 0;                            // variable to keep the actual value 

int phase0 = BOTTOM;                      // Initial Values
int phase1 = TOP * 0.33 ;                 // 120 degress ahead
int phase2 = TOP * 0.66 ;                 // 240 degress ahead

int phase0inc = +5;
int phase1inc = +5;
int phase2inc = +5;

int ledpin0 = 9;                           // light connected to digital pin 9
int ledpin1 = 10;                          // light connected to digital pin 10
int ledpin2 = 11;                          // light connected to digital pin 11
 
void setup() 
{ 
  // nothing for setup 
} 
 
void loop() 
{ 
  analogWrite(ledpin0, phase0);           // sets the value (range from 0 to 255) 
  analogWrite(ledpin1, phase1);           // sets the value (range from 0 to 255) 
  analogWrite(ledpin2, phase2);           // sets the value (range from 0 to 255) 

  phase0 += phase0inc;                    // increase/descrease values
  phase1 += phase1inc;
  phase2 += phase2inc;
          
  if (phase0 > TOP)                       // Check to see if anything is too big
    phase0inc = -5;
  if (phase1 > TOP)
    phase1inc = -5;
  if (phase2 > TOP)
    phase2inc = -5;
    
  if (phase0 < BOTTOM)                    // Check to see if anything is too small
    phase0inc = 5;
  if (phase1 < BOTTOM)
    phase1inc = 5;
  if (phase2 < BOTTOM)
    phase2inc = 5;

  delay(50);                              // Speed of the loop, bigger number = slower
  
}