#define PB 2
#define hijau 5
#define kuning 6
#define merah 7
boolean status = 0;
void setup() {
  pinMode(PB, INPUT);
  pinMode(hijau, OUTPUT);
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);
}

void loop() {
  status=digitalRead(PB);
  if(status==LOW)
  {
    digitalWrite(hijau, HIGH);
    digitalWrite(merah, LOW);
    delay(200);
    digitalWrite(kuning, HIGH);
    digitalWrite(hijau, LOW);
    delay(200);
    digitalWrite(merah, HIGH);
    digitalWrite(kuning, LOW);
    delay(200);

  }
  else{
    digitalWrite(merah, HIGH);
    digitalWrite(hijau, LOW);
    delay(200);
    digitalWrite(kuning, HIGH);
    digitalWrite(merah, LOW);
    delay(200);
    digitalWrite(hijau, HIGH);
    digitalWrite(kuning, LOW);
    delay(200);
  }

}