#define LED_PIN 10
#define BUTTON_PIN 2

// Debounce parameters
const unsigned long DEBOUNCE_DELAY = 20; // 20 ms
uint8_t buttonState = LOW;
uint8_t lastButtonState = LOW;
unsigned long lastDebounceTime = 0;

void setup() {
  pinMode(LED_PIN, OUTPUT);           // LED output
  pinMode(BUTTON_PIN, INPUT_PULLDOWN); // Button with internal pulldown
  Serial.begin(115200);               // Serial monitor
}

void loop() {
  uint8_t reading = digitalRead(BUTTON_PIN);

  // Check if button state changed
  if (reading != lastButtonState) {
    lastDebounceTime = millis(); // reset debounce timer
  }

  // Only update if stable for DEBOUNCE_DELAY
  if ((millis() - lastDebounceTime) > DEBOUNCE_DELAY) {
    if (reading != buttonState) {
      buttonState = reading; // update stable button state
    }
  }

  lastButtonState = reading;

  digitalWrite(LED_PIN, buttonState); // Mirror button state to LED
  Serial.println(buttonState);        // Print 0 or 1
}