const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9}; 
const int buzzerPin = 10; 
const int button1 = 11; 
const int button2 = 12; 

int currentLED = 0; 
bool direction = true; 
bool isRunning = false; 

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  pinMode(buzzerPin, OUTPUT);
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
}

void loop() {
  bool button1State = digitalRead(button1) == LOW;
  bool button2State = digitalRead(button2) == LOW;

  if (button1State) {
    isRunning = true; 
    delay(200); 
  }

  if (button2State) {
    direction = !direction; 
    delay(200); 
  }

  if (isRunning) {
    for (int i = 0; i < 8; i++) {
      digitalWrite(ledPins[i], LOW);
    }

    digitalWrite(ledPins[currentLED], HIGH);

    delay(100);

    if (direction) {
      currentLED++;
      if (currentLED == 7) {
        direction = false;
        tone(buzzerPin, 1000, 200); 
      }
    } else {
      currentLED--;
      if (currentLED == 0) {
        direction = true;
        tone(buzzerPin, 1000, 200); 
      }
    }
  }
}