char RECIVE_DATA = 0;
void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);

}

void loop() {
  if (Serial.available() > 0)
  { RECIVE_DATA = Serial.read();
    Serial.print(RECIVE_DATA);
    Serial.print("\n");

    if (RECIVE_DATA == '1')
      digitalWrite(13, HIGH);
    else if (RECIVE_DATA == '0')
      digitalWrite(13, LOW);

  }

}