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int redPin = 11;
int greenPin = 10;
int bluePin = 9;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  digitalWrite(redPin, HIGH);
  digitalWrite(greenPin, LOW);
  digitalWrite(bluePin, LOW);
}

int redValue;
int greenValue;
int blueValue;

void loop() {
  #define delayTime 10

  for (int i = 0; i < 255; i += 1) {
    redValue -= 1;
    greenValue += 1;
    analogWrite(redPin, redValue);
    analogWrite(greenPin, greenValue);
    delay(delayTime);
  }

  redValue = 0;
  greenValue = 255;
  blueValue = 0;

  for (int i = 0; i < 255; i += 1) {
    greenValue -= 1;
    blueValue += 1;
    analogWrite(greenPin, greenValue);
    analogWrite(bluePin, blueValue);
    delay(delayTime);
  }

  redValue = 0;
  greenValue = 0;
  blueValue = 255;

  for (int i = 0; i < 255; i += 1) {
    blueValue -= 1;
    redValue += 1;
    analogWrite(bluePin, blueValue);
    analogWrite(redPin, redValue);
    delay(delayTime);
  }
}