const int ledBluePin = 5;
const int ledRedPin = 6;
const int ledGreenPin = 4;
int rgb[3];
int inc = 0;

void setup(){
  pinMode(ledRedPin, OUTPUT);
  pinMode(ledGreenPin, OUTPUT);
  pinMode(ledBluePin, OUTPUT);

  rgb[0] = 0;
  rgb[1] = 255;
  rgb[2] = 255;
  
  analogWrite(ledRedPin, rgb[0]);
  analogWrite(ledGreenPin, rgb[1]);
  analogWrite(ledBluePin, rgb[2]);
}

void loop(){
  int dec = (inc + 1) % 3;
  rgb[inc] += 1;
  rgb[dec] -= 1;
  analogWrite(ledRedPin, rgb[0]);
  analogWrite(ledGreenPin, rgb[1]);
  analogWrite(ledBluePin, rgb[2]);
  Serial.print(rgb[0]);
  Serial.print(" ");
  Serial.print(rgb[1]);
  Serial.print(" ");
  Serial.println(rgb[2]);
  if (rgb[inc] == 255) {
      inc = (inc + 1) % 3;
  }
  delay(5);
}