char val;

void setup() {
  pinMode(13, OUTPUT);
  Serial.begin(9600);

}

void loop() {

  if(Serial.available()){
    val= Serial.read();
    Serial.println(val);
  }

  if(val=='2'){
    digitalWrite(13, HIGH);
  }
  else if (val=='1'){
    digitalWrite(13, LOW);
  }
  delay(100);


}