#define BUTTON 27
#define LED 4

int buttonState;

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(LED, OUTPUT);
}

void loop() {
  buttonState = digitalRead(BUTTON);
  delay(100);
  if (buttonState == LOW) {
    Serial.println("Button is pressed!");
    digitalWrite(LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }
}