// Program Lampu LED Arduino UNO
// Merah = pin 13
// Kuning = pin 12
// Hijau = pin 11

int merah = 13;
int kuning = 12;
int hijau = 11;

void setup() {
  pinMode(merah, OUTPUT);
    pinMode(kuning, OUTPUT);
      pinMode(hijau, OUTPUT);
      }

      void loop() {

        // LED merah nyala
          digitalWrite(merah, HIGH);
            digitalWrite(kuning, LOW);
              digitalWrite(hijau, LOW);
                delay(1000);

                  // LED kuning nyala
                    digitalWrite(merah, LOW);
                      digitalWrite(kuning, HIGH);
                        digitalWrite(hijau, LOW);
                          delay(1000);

                            // LED hijau nyala
                              digitalWrite(merah, LOW);
                                digitalWrite(kuning, LOW);
                                  digitalWrite(hijau, HIGH);
                                    delay(1000);
                                    }