gistfile1.pde

const int buttonPin = 2;  // Number of the pushbutton pin
const int ledPin = 13;    // Number of the LED pin

int buttonState = 0;
int lightOn = false;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  
  if (buttonState == HIGH)
    lightOn = !lightOn;
   
  if (lightOn) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
}