const int lampuMerah = 13;
const int lampuKuning = 12;
const int lampuHijau = 11;
const int tombol = 7;

void setup() {
  // put your setup code here, to run once:
  pinMode(tombol, INPUT);
  pinMode(lampuMerah, OUTPUT);
  pinMode(lampuKuning, OUTPUT);
  pinMode(lampuHijau, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int button = digitalRead(tombol);
  if(button==HIGH){
   digitalWrite(lampuKuning, HIGH);
    delay(3000);
    digitalWrite(lampuKuning, LOW);
    digitalWrite(lampuMerah, HIGH);
    delay(5000);
    digitalWrite(lampuKuning, HIGH);
    delay(2000);
    digitalWrite(lampuHijau, HIGH);
    digitalWrite(lampuKuning, LOW);
    digitalWrite(lampuMerah, LOW);
    delay(3000);
    digitalWrite(lampuHijau, LOW);
  }
}