#define BUTTON_PIN 12  // Button connected to digital pin 12
#define LED_COUNT 10    // Total number of LEDs

int ledPins[LED_COUNT] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11}; // Array to hold LED pins
int currentLED = 0; // To track the current LED being lit

void setup() {
    // Initialize LED pins as outputs
    for (int i = 0; i < LED_COUNT; i++) {
        pinMode(ledPins[i], OUTPUT);
    }
    // Initialize button pin
    pinMode(BUTTON_PIN, INPUT_PULLUP); // Use internal pull-up resistor
}

void loop() {
    // Read the button state
    if (digitalRead(BUTTON_PIN) == LOW) { // Button pressed (active LOW)
        // Turn off all LEDs first
        for (int i = 0; i < LED_COUNT; i++) {
            digitalWrite(ledPins[i], LOW);
        }
        
        // Turn on the current LED
        digitalWrite(ledPins[currentLED], HIGH);
        
        // Move to the next LED
        currentLED++;
        if (currentLED >= LED_COUNT) {
            currentLED = 0; // Loop back to the first LED
        }
        
        // Short delay to debounce
        delay(200);
    }
}