// Define the total number of LEDs
const int NUM_LEDS = 8;

// Define the pin assignments for the LEDs (assuming 8 LEDs connected to digital pins 2 to 9)
const int LED_pins[] = {2, 3, 4, 5, 6, 7, 8, 9};

void setup() {
    // Initialize LED pins as output
    for (int i = 0; i < NUM_LEDS; i++) {
        pinMode(LED_pins[i], OUTPUT);
    }
}

void loop() {
    // Sequentially turn on each LED with a one-second interval
    for (int i = 0; i < NUM_LEDS; i++) {
        // Turn on the current LED
        digitalWrite(LED_pins[i], HIGH);
        
        // Turn off the previously lit LED
        if (i > 0) {
            digitalWrite(LED_pins[i - 1], LOW);
        }
        
        // Delay for one second
        delay(1000);
    }
    
    // Turn off the last LED after all LEDs have been lit
    digitalWrite(LED_pins[NUM_LEDS - 1], LOW);
}