import utime
from machine import Pin
from hcsr04 import HCSR04

TRIGGER_PIN = 1
ECHO_PIN = 2

SPACE_1_LED = Pin(3, Pin.OUT)
SPACE_2_LED = Pin(4, Pin.OUT)

def initialize_ultrasonic_sensor(trigger_pin, echo_pin):
    return HCSR04(trigger_pin, echo_pin)

def check_parking_space(ultrasonic_sensor, threshold_distance=10):
    distance = ultrasonic_sensor.distance_cm()
    return distance < threshold_distance

def indicate_parking_space_status(occupied):
    SPACE_1_LED.value(occupied)
    SPACE_2_LED.value(not occupied)

def main():
    ultrasonic_sensor = initialize_ultrasonic_sensor(TRIGGER_PIN, ECHO_PIN)

    while True:
        try:
            occupied = check_parking_space(ultrasonic_sensor)
            indicate_parking_space_status(occupied)
            utime.sleep(1)
        except KeyboardInterrupt:
            break

if __name__ == "__main__":
    main()