#define LAMPU1  26  
#define LAMPU2  27  
#define LAMPU3  14  
#define LAMPU4  12  

void setup() {
  Serial.begin(115200);

  pinMode(LAMPU1, OUTPUT);
  pinMode(LAMPU2, OUTPUT);
  pinMode(LAMPU3, OUTPUT);
  pinMode(LAMPU4, OUTPUT);

  digitalWrite(LAMPU1, LOW);
  digitalWrite(LAMPU2, LOW);
  digitalWrite(LAMPU3, LOW);
  digitalWrite(LAMPU4, LOW);

  Serial.println("1, 2, 3, 4 UNTUK HIDUPKAN LAMPU. 5, 6, 7, 8 UNTUK MATIKAN LAMPU");
}

void loop() {
  if (Serial.available()) {
    char input = Serial.read();

    switch (input) {
      case '1': digitalWrite(LAMPU1, HIGH); Serial.println("LAMPU 1 HIDUP"); break;
      case '2': digitalWrite(LAMPU2, HIGH); Serial.println("LAMPU 2 HIDUP"); break;
      case '3': digitalWrite(LAMPU3, HIGH); Serial.println("LAMPU 3 HIDUP"); break;
      case '4': digitalWrite(LAMPU4, HIGH); Serial.println("LAMPU 4 HIDUP"); break;
      case '5': digitalWrite(LAMPU1, LOW); Serial.println("LAMPU 1 MATI"); break;
      case '6': digitalWrite(LAMPU2, LOW); Serial.println("LAMPU 2 MATI"); break;
      case '7': digitalWrite(LAMPU3, LOW); Serial.println("LAMPU 3 MATI"); break;
      case '8': digitalWrite(LAMPU4, LOW); Serial.println("LAMPU 4 MATI"); break;
      default: Serial.println("Perintah tidak dikenal!");
    }
  }
}