#define LED_hijau 13
#define LED_kuning 12
#define LED_merah 11
#define tombol 7
int status=0;

void setup(){
  Serial.begin(9600);
  pinMode(LED_hijau, OUTPUT);
  pinMode(LED_kuning, OUTPUT);
  pinMode(LED_merah, OUTPUT);
  pinMode(tombol, INPUT);

  digitalWrite(LED_hijau, LOW);
  digitalWrite(LED_kuning, LOW);
  digitalWrite(LED_merah, LOW);
}

void loop(){
  if(digitalRead(tombol)==HIGH){
    status++;
    delay(100);
  }

  if (status == 1){
    digitalWrite(LED_hijau, HIGH);
    digitalWrite(LED_kuning, LOW);
    digitalWrite(LED_merah, LOW);
  }
  else if (status == 2){
    digitalWrite(LED_kuning, HIGH);
    digitalWrite(LED_hijau, LOW);
    digitalWrite(LED_merah, LOW);
  }
  else if (status == 3){
    digitalWrite(LED_merah, HIGH);
    digitalWrite(LED_kuning, LOW);
    digitalWrite(LED_hijau, LOW);
  }
  else if (status == 4){
    status = 0;
  }

  Serial.println(status);
  delay(100);
  
}