from machine import Pin
from time import sleep

led_pins = [2, 4, 5, 13, 14, 16, 17, 18]
leds = [Pin(pin, Pin.OUT) for pin in led_pins]

enter_button = Pin(34, Pin.IN, Pin.PULL_UP)
exit_button = Pin(35, Pin.IN, Pin.PULL_UP)

count = 0

def update_leds(n):
    for i in range(8):
        leds[i].value(1 if i < n else 0)

prev_enter = enter_button.value()
prev_exit = exit_button.value()

while True:
    curr_enter = enter_button.value()
    curr_exit = exit_button.value()

    if curr_enter == 0 and prev_enter == 1:
        if count < 8:
            count += 1
            update_leds(count)
        sleep(0.1)  

    if curr_exit == 0 and prev_exit == 1:
        if count > 0:
            count -= 1
            update_leds(count)
        sleep(0.1)

    prev_enter = curr_enter
    prev_exit = curr_exit

    sleep(0.01)