const int pinMerah = 9;
const int pinKuning = 10;
const int pinHijau = 11;

void setup() {
  pinMode(pinMerah, OUTPUT);
  pinMode(pinKuning, OUTPUT);
  pinMode(pinHijau, OUTPUT);
  digitalWrite(pinMerah, LOW);
  digitalWrite(pinKuning, LOW);
  digitalWrite(pinHijau, LOW);
  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(pinMerah, LOW);
  digitalWrite(pinKuning, LOW);
  digitalWrite(pinHijau, HIGH);
  delay(4000);
  digitalWrite(pinKuning, HIGH);
  digitalWrite(pinHijau, LOW);
  delay(1500);
  digitalWrite(pinMerah, HIGH);
  digitalWrite(pinKuning, LOW);
  digitalWrite(pinHijau, LOW);
  delay(3000);

  // put your main code here, to run repeatedly:

}