from machine import Pin
import time

pins = [2, 4, 5, 16, 17, 18, 21, 27]
led_array = [Pin(p, Pin.OUT) for p in pins]


in_button = Pin(34, Pin.IN)
out_button = Pin(35, Pin.IN)

car_count = 0


def show_leds(count):
    for idx in range(8):
        led_array[idx].value(1 if idx < count else 0)

last_in = 1
last_out = 1

while True:
    current_in = in_button.value()
    current_out = out_button.value()

    if current_in == 0 and last_in == 1 and car_count < 8:
        car_count += 1
        show_leds(car_count)
        time.sleep(0.01)

    if current_out == 0 and last_out == 1 and car_count > 0:
        car_count -= 1
        show_leds(car_count)
        time.sleep(0.01)

    last_in = current_in
    last_out = current_out
    time.sleep(0.01)