const int buttonPin = 2;
const int ledPins[8] = {3, 4, 5, 6, 7, 8, 9, 10};
int currentLED = 0;
int lastButtonState = LOW;  
int buttonState;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

void setup() {
  pinMode(buttonPin, INPUT);
  for (int i = 0; i < 8; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);
  }
  digitalWrite(ledPins[currentLED], HIGH);
}

void loop() {
  int reading = digitalRead(buttonPin);

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

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == HIGH) {
        digitalWrite(ledPins[currentLED], LOW);
        currentLED = (currentLED + 1) % 8;
        digitalWrite(ledPins[currentLED], HIGH);
      }
    }
  }
  
  lastButtonState = reading;
}