#include <Arduino.h>

#define LED_PIN 2
#define BUTTON_PIN 4

bool blinkMode = true;
bool lastButtonState = HIGH;
unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 200;

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

void loop() {
  bool buttonState = digitalRead(BUTTON_PIN);

  if (buttonState == LOW && lastButtonState == HIGH) {
    if (millis() - lastDebounceTime > debounceDelay) {
      blinkMode = !blinkMode;
      lastDebounceTime = millis();
    }
  }

  lastButtonState = buttonState;

  if (blinkMode) {
    digitalWrite(LED_PIN, HIGH);
    delay(500);
    digitalWrite(LED_PIN, LOW);
    delay(500);
  } else {
    digitalWrite(LED_PIN, HIGH);
  }
}