#define buttonPin 7
#define ledPin 8

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); // use internal pull-up
  pinMode(ledPin, OUTPUT);
}

void loop() {
  int buttonState = digitalRead(buttonPin);

  if (buttonState == LOW) {         // button pressed
    digitalWrite(ledPin, HIGH);     // LED ON
  } else {
    digitalWrite(ledPin, LOW);      // LED OFF
  }
}