#define LED_PIN 4
#define BUTTON_PIN 14

int buttonState = 0; 

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

void loop() {
  buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == HIGH) {
    // turn LED on:
    analogWrite(LED_PIN, LOW);
  } else {
    // turn LED off:
    analogWrite(LED_PIN, HIGH);
  }

}