char Incoming_value = 0;


void setup() 

{

Serial.begin(9600);
pinMode(13, OUTPUT);
}

void loop() 
{
  if(Serial.available() > 0)
  {
    Incoming_value = Serial.read();
    Serial.print (Incoming_value);
    Serial.print ("\n");
    if (Incoming_value == '1')
     digitalWrite(13,HIGH);
    else if(Incoming_value == '0')
   digitalWrite (13, LOW);  
  }
  
}