int LED = 13;
void setup()
{
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  if(Serial.available()>0)
  {
    char state = Serial.read();
    if(state == '1')
    {
      digitalWrite(LED, HIGH);
      Serial.println("LED ON");
    }
    else{
      digitalWrite(LED, LOW);
      Serial.println("LED OFF");
    }
  }
  delay(1000);
}