from machine import Pin
from time import sleep

# Setup LEDs on GPIO pins 2 through 9
led_pins = [Pin(pin_num, Pin.OUT) for pin_num in range(2, 10)]

# Setup entrance and exit buttons with internal pull-down resistors
entrance_button = Pin(14, Pin.IN, Pin.PULL_DOWN)  # Entrance button on GPIO14
exit_button = Pin(27, Pin.IN, Pin.PULL_DOWN)      # Exit button on GPIO27

car_count = 0  # Current number of cars inside

def update_leds(count):
    # Turn on LEDs equal to the count, turn off the rest
    for i, led in enumerate(led_pins):
        led.value(1 if i < count else 0)

def wait_for_release(pin):
    # Wait until the button is released to avoid multiple counts on one press
    while pin.value() == 1:
        sleep(0.01)

while True:
    if entrance_button.value() == 1:
        if car_count < 8:
            car_count += 1
            update_leds(car_count)
        wait_for_release(entrance_button)

    if exit_button.value() == 1:
        if car_count > 0:
            car_count -= 1
            update_leds(car_count)
        wait_for_release(exit_button)

    sleep(0.05)