#define LED_PIN 13
#define BUTTON_PIN 2

int buttonState = 0;
int lastButtonState = 0;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50; 
unsigned long ledDelay = 500;
unsigned long previousMillis = 0; 

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
}

void loop() {
  int button_val = digitalRead(BUTTON_PIN);

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

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (button_val != buttonState) {
      buttonState = button_val;

      if (buttonState == HIGH) {
        ledDelay += 250;
        if (ledDelay > 2000) {
          ledDelay = 500;
        }
      }
    }
  }

  lastButtonState = button_val;

  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= ledDelay) {
    previousMillis = currentMillis;
    digitalWrite(LED_PIN, !digitalRead(LED_PIN));
  }
}