const int buttonPin = 2;    
const int ledPin = 13;      

bool ledState = false;      
bool lastButtonState = HIGH; 
unsigned long lastDebounceTime = 0;  
const unsigned long debounceDelay = 50; 

void setup() {
  pinMode(buttonPin, INPUT_PULLUP); 
  pinMode(ledPin, OUTPUT);           
  digitalWrite(ledPin, LOW);         
}

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

  if (reading != lastButtonState) {
    lastDebounceTime = millis(); 
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    static bool buttonPressed = false;

    if (reading == LOW && !buttonPressed) {
      buttonPressed = true;

      ledState = !ledState;
      digitalWrite(ledPin, ledState ? HIGH : LOW);
    }
    else if (reading == HIGH) {
      buttonPressed = false;
    }
  }

  lastButtonState = reading; 
}