/*

  Button

  Turns on and off a light emitting diode(LED)

  connected to digital  pin 13, when pressing a

  pushbutton attached to pin 2.

   The circuit:

  * LED attached from pin 13 to ground

  * pushbutton attached to pin 2 from +5V

  * 10K resistor attached to pin 2 from ground

  * Note: on most Arduinos there is already an LED

  on the board  attached to pin 13.

  created 2005  by DojoDave <http://www.0j0.org>

  modified 30 Aug 2011  by Tom Igoe

  This example code is in the public domain.

  http://www.arduino.cc/en/Tutorial/Button

*/

int buttonState = 0;

void setup()

{

  pinMode(2, INPUT);

  pinMode(13, OUTPUT);

}

void loop()

{

  // read the state of the pushbutton value

  buttonState = digitalRead(2);

  // check if pushbutton is pressed.  if it is, the

  // buttonState is HIGH

  if (buttonState == HIGH) {

    // turn LED on

    digitalWrite(13, HIGH);

  } else {

    // turn LED off

    digitalWrite(13, LOW);

  }

  delay(10); // Delay a little bit to improve simulation performance

}