const int redPin= 2;
const int greenPin = 4;
const int bluePin = 3;

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

void loop() {
  setColor(255, 0, 0); 
  delay(1000);
  setColor(0, 255, 0); 
  delay(1000);
  setColor(0, 0, 255); 
  delay(1000);
  setColor(128, 128, 0);
  delay(1000);
  setColor(0, 128, 128);
  delay(1000);
  setColor(128, 0, 128);
  delay(1000);
  setColor(128, 128, 128);
  delay(1000);
  setColor(255, 255, 255);
  delay(1000);
  setColor(0, 0, 0);
  delay(1000);
}

void setColor(int redValue, int greenValue, int blueValue) {
  analogWrite(redPin, redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin, blueValue);
}