const int buttonPin = 14;
int buttonState =0;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(buttonPin, INPUT);
  Serial.println("set up done!");
  delay(1000);
}

void loop() {
  buttonState = digitalRead(buttonPin);
  if (buttonState ==HIGH){
    Serial.println("Dang nhan nut");
  } else {
    Serial.println("Khong nhan nut");
  }
  // put your main code here, to run repeatedly:
}