const int buttonPin =14;
// the number of the pushbutton pin
// variables will change:
int buttonState = 0;
// Biền lưu trang thái nút nhẫn
void setup() {
Serial.begin(115200);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT);
  Serial.println("Setup Done");
  delay(1000);
}
void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonState == HIGH) {
  // turn LED on
  Serial.println("Dang nhan nút");
  } else {
  //turn LED off
  Serial.println("Không nhan nút");
  } 
}