int buttonPin = 2;
int LED = 13;
void setup() {
  // Define pin #2 as input
  pinMode(buttonPin, INPUT);
  // Define pin #13 as output, for the LED
  pinMode(LED, OUTPUT);
}
void loop() {
// Read the value of the input. It can either be 1 or 0.
  int buttonValue = digitalRead(buttonPin);
  if (buttonValue == HIGH) {
    // If button pushed, turn LED on
    digitalWrite(LED,HIGH);
  } else {
    // Otherwise, turn the LED off
    digitalWrite(LED, LOW);
  }
}