// This is meant for a Common Anodote RGB LED
// See all those (255 - val). 

#define GREEN 9
#define BLUE 10
#define RED 11
#define delayTime 20

void setup() {

  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  pinMode(RED, OUTPUT);
  digitalWrite(GREEN, HIGH);
  digitalWrite(BLUE, HIGH);
  digitalWrite(RED, HIGH);
}

int redVal;
int blueVal;
int greenVal;
 
void loop() {
 
  int redVal = 255;
  int blueVal = 0;
  int greenVal = 0;
  for( int i = 0 ; i < 255 ; i += 1 ){
    greenVal += 1;
    redVal -= 1;
    analogWrite( GREEN, 255 - greenVal );
    analogWrite( RED, 255 - redVal );

    delay( delayTime );
  }
 
  redVal = 0;
  blueVal = 0;
  greenVal = 255;
  for( int i = 0 ; i < 255 ; i += 1 ){
    blueVal += 1;
    greenVal -= 1;
    analogWrite( BLUE, 255 - blueVal );
    analogWrite( GREEN, 255 - greenVal );

    delay( delayTime );
  }
 
  redVal = 0;
  blueVal = 255;
  greenVal = 0;
  for( int i = 0 ; i < 255 ; i += 1 ){
    redVal += 1;
    blueVal -= 1;
    analogWrite( RED, 255 - redVal );
    analogWrite( BLUE, 255 - blueVal );

    delay( delayTime );
  }
}