int ledPinMerah = 8;
int ledPinKuning = 9;
int ledPinHijau = 10;


void setup() {
  pinMode(ledPinMerah, OUTPUT);
  pinMode(ledPinKuning, OUTPUT);
  pinMode(ledPinHijau, OUTPUT);

}

void loop() {
  digitalWrite(ledPinMerah, HIGH);
  digitalWrite(ledPinKuning, LOW);
  digitalWrite(ledPinHijau, LOW);
  delay(2000);

  digitalWrite(ledPinMerah, LOW);
  digitalWrite(ledPinKuning, HIGH);
  digitalWrite(ledPinHijau, LOW);
  delay(2000);

  digitalWrite(ledPinMerah, LOW);
  digitalWrite(ledPinKuning, LOW);
  digitalWrite(ledPinHijau, HIGH);
  delay(2000);

}