gistfile1.c

int ledPin = 13;
boolean ledOn = false;

void setup() {
  pinMode(ledPin, OUTPUT);  // Set servo pin as an output pin
  Serial.begin(9600);
  //Serial.println("Arduino serial");
}

void loop() {
  if (Serial.available() > 0) {
    int message = Serial.read();

    if (message == 49) { digitalWrite(ledPin, HIGH); }
    if (message == 48) { digitalWrite(ledPin, LOW); }

    // print pulseWidth back to the Serial Monitor (uncomment to debug)
    // Serial.print("Pulse Width: ");
    // Serial.print(pulseWidth);
    // Serial.println("us");   // microseconds
  }
}