const int redPin = 3;
const int greenPin = 5;
const int bluePin = 6;

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

void loop() {
  analogWrite(bluePin, 0);
  analogWrite(redPin, 255);
  delay(1000);
  
  analogWrite(redPind, 0);
  analogWrite(greenPin, 255);
  delay(1000);
  
  analogWrite(greenPin, 0);
  analogWrite(bluePin, 255);
  delay(1000);
}