#define LED_PIN 15
#define BUTTON_PIN 14

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW) {
    digitalWrite(LED_PIN, HIGH);   // LED ON
  } else {
    digitalWrite(LED_PIN, LOW);    // LED OFF
  }
}