Modified version of Blink for Arduino workshop

/*
  Blink

 Turns on an LED on for one second, then off for one second, repeatedly.

 The circuit:
 * LED connected from digital pin 13 to ground.

 * Note: On most Arduino boards, there is already an LED on the board
 connected to pin 13, so you don't need any extra components for this example.

 Modified by Brian Jepson for a webcast

 based on an original...
 Created 1 June 2005
 By David Cuartielles

 http://arduino.cc/en/Tutorial/Blink

 based on an orginal by H. Barragan for the Wiring i/o board

 */

int ledPin =  13;    // LED connected to digital pin 13
int buttonPin = 2;   // button connected to digital pin 2
int val = 0;         // stores the state of the button

// The setup() method runs once, when the sketch starts
void setup()   {
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);

  // initialize the button pin as an input
  pinMode(buttonPin, INPUT);
}

// the loop() method runs over and over again,
// as long as the Arduino has power
void loop()
{
  val = digitalRead(buttonPin);
  if (val == HIGH) {
    digitalWrite(ledPin, HIGH);   // set the LED on
  } else {
    digitalWrite(ledPin, LOW);    // set the LED off
  }
  delay(10);
}