 /***************************************************
   Simple serial server
 ****************************************************/
+
+// Pin 13 has an LED connected on most Arduino boards.
+int led_pin = 13;
 
 //serial
 String inputString = "";         // a string to hold incoming data

    }
  }
}

void loop(){
  // print the string when a newline arrives:
  if (stringComplete) {
    flash(200);
    Serial.println(inputString);
    // clear the string:
    inputString = "";
