#define pb 15
#define merah 5 
#define kuning 19 
#define hijau 18


void setup() {
  
  pinMode(pb, INPUT);
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(hijau, OUTPUT);
}


void loop() {
  if (digitalRead(pb)== HIGH){

      digitalWrite(kuning, HIGH);
      delay(3000);
       digitalWrite(kuning, LOW);
      digitalWrite(merah, HIGH);
      delay(5000);
      
      digitalWrite(kuning, HIGH);
      delay(2000);
      digitalWrite(merah, LOW);
      digitalWrite(kuning, LOW);
        
      digitalWrite(hijau, HIGH);
      delay(3000);

  }
  else {
      digitalWrite(merah,LOW);
      digitalWrite(kuning,LOW);
      digitalWrite(hijau,LOW);
  }
  
  
}