#define LED_KUNING 19
#define LED_MERAH 5
#define LED_HIJAU 4

void setup() {
  pinMode(LED_KUNING, OUTPUT);
  pinMode(LED_MERAH, OUTPUT);
  pinMode(LED_HIJAU, OUTPUT);
}

void loop() { 
  digitalWrite(LED_KUNING, HIGH);
  digitalWrite(LED_MERAH, HIGH);
  digitalWrite(LED_HIJAU, HIGH);
  
  delay(2000); 

  digitalWrite(LED_KUNING, LOW);
  digitalWrite(LED_MERAH, LOW);
  digitalWrite(LED_HIJAU, LOW);

  delay(2000);
}