int buttonPin = 34;
int ledPin = 25; 

int buttonState = HIGH; 
int lastButtonState = HIGH; 
int ledState = LOW;

unsigned long lastDebounceTime = 0;  
unsigned long debounceDelay = 50;

void setup() {
  pinMode(buttonPin, INPUT);  
  pinMode(ledPin, OUTPUT);   
}

void loop() {
  int reading = digitalRead(buttonPin); 

  // Kiểm tra debounce
  if (reading != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == LOW) {
        ledState = !ledState; 
      }
    }
  }

  digitalWrite(ledPin, ledState); 
  lastButtonState = reading;       
}