void setup() 
{
  // put your setup code here, to run once:
  pinMode(19, OUTPUT); //Merah
  pinMode(18, OUTPUT); //Kuning
  pinMode(5, OUTPUT);  //Hijau
  pinMode(15, INPUT);  //Tombol
}

void loop() 
{
  // put your main code here, to run repeatedly:
  if(digitalRead(15) == HIGH)
  {
    digitalWrite(19, LOW);
    digitalWrite(18, HIGH);
    digitalWrite(5, LOW);
    delay(3000);
    digitalWrite(19, HIGH);
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
    delay(5000);
    digitalWrite(19, LOW);
    digitalWrite(18, HIGH);
    digitalWrite(5, LOW);
    delay(2000);
    digitalWrite(19, LOW);
    digitalWrite(18, LOW);
    digitalWrite(5, HIGH);
    delay(3000);
  } else {
    digitalWrite(19, LOW);
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
  }
  
}