const int pinMerah = 2;
const int pinKuning = 3;
const int pinHijau = 4;
const int delayWaktu = 1000;

void setup() {
pinMode(pinMerah, OUTPUT);
pinMode(pinKuning, OUTPUT);
pinMode(pinHijau, OUTPUT);
}

void loop(){
  analogWrite(pinMerah, 255);
  analogWrite(pinKuning, 0);
  analogWrite(pinHijau, 0);
  delay(delayWaktu);

  analogWrite(pinMerah, 0);
  analogWrite(pinKuning, 255);
  analogWrite(pinHijau, 0);
  delay(delayWaktu);

  analogWrite(pinMerah, 0);
  analogWrite(pinKuning, 0);
  analogWrite(pinHijau, 255);
  delay(delayWaktu);
}