const int redPin = 9;
const int greenPin = 11;
const int bluePin = 10;
 
 
void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}
 
 
void loop() {
  setColor(255, 0, 0); 
  delay(500);
  setColor(0, 255, 0); 
  delay(500);
  setColor(0, 0, 255);
  delay(500);
  for (int j = 0; j < 256; j++) {
    setColor(j, 20, 30);
    delay(15);
  }
  for (int i = 0; i < 236; i++) {
    setColor(235 - i, 20 + i, 30);
    delay(15);
  }
  for (int k = 0; k < 226; k++) {
    setColor(k, 255, 30 + k);
    delay(15);
  }
}
 
 
void setColor(int red, int green, int blue) {
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);
}