#define led 13
int command = 0;
void setup() {
  pinMode (led, OUTPUT);
  Serial.begin (9600);
  Serial.println
  ("latihan monitoring dan mengendalikan led dengan serial monitor");
  Serial.println
  ("silahkan masukkan input command");
}
void loop(){
  if ( Serial.available())
  {
    command = Serial.read
    ();
    if (command == '1')
    { digitalWrite (led, HIGH);
    Serial.println ("ON");
    }
    else if (command == '0')
    { digitalWrite (led, LOW);
    Serial.println ("OFF");
    }
  }
}