const int ledPin    = 13;  // LED ulanadi
const int buttonPin = 2;   // Tugma ulanadi (ichki pull-up bilan)

bool ledState        = false;  // LED holati (false = o‘chiq)
bool lastButtonState = HIGH;   // Oxirgi tugma o‘qilishi

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);  
  digitalWrite(ledPin, LOW);        // Dastlab LED o‘chiq bo‘lsin
}

void loop() {
  bool currentButtonState = digitalRead(buttonPin);

  // Faqat «yuqoridan pastga» (HIGH→LOW) o‘tishda toggle qilamiz
  if (lastButtonState == HIGH && currentButtonState == LOW) {
    // Tugma bosildi: ledState ni teskari holatga o‘zgartiramiz
    ledState = !ledState;
    // Ternary operator: agar ledState == true boʻlsa HIGH, aks holda LOW
    digitalWrite(ledPin, ledState ? HIGH : LOW);
  }

  lastButtonState = currentButtonState;
  delay(50);  // Debounce uchun kichik kechikish
}