const int buttonPin = 2; // Pin connected to the button
const int ledPin = 13;   // Pin connected to the LED

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // Set the button pin as an input
  pinMode(ledPin, OUTPUT);          // Set the LED pin as an output
}

void loop() {
  if (digitalRead(buttonPin) == LOW) { // If button is pressed
    digitalWrite(ledPin, HIGH);        // Turn on the LED
  } else {
    digitalWrite(ledPin, LOW);         // Turn off the LED
  }
}