void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(10, OUTPUT);
Serial.println("Hallo Mikrokontroler");
}

void loop() {
if(Serial.available())
  {
    String perintah = Serial.readStringUntil('\n');
    if (perintah == "on")
    {
      digitalWrite(10, HIGH);
      Serial.println("Lampu Menyala");
    }
    else if (perintah == "off")
    {
      digitalWrite(10, LOW);
      Serial.println("Lampu Mati");
    }
  }
}