int ledPin1 = 2;
int ledPin2 = 3;
void setup() {
  Serial.begin(9600);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  Serial.println("Angka '1' menghidupkan LED 1. Angka '2' menghidupkan LED 2. Angka '0' Mematikan semua LED.");
}
void loop () {
  if (Serial.available() > 0) {
    char command = Serial.read();
    switch (command) {
      case '0':
      digitalWrite(ledPin1, LOW);
      digitalWrite(ledPin2, LOW);
      Serial.println("All LEDs turned off");
      break;
      case '1':
      digitalWrite(ledPin1, HIGH);
      digitalWrite(ledPin2, LOW);
      Serial.println("LED 1 turned on");
      break;
      case '2':
      digitalWrite(ledPin1, LOW);
      digitalWrite(ledPin2, HIGH);
      Serial.println("LED 2 turned on");
      break;
      default :
      Serial.println("");
    }
  }
}