from stepperdriver import Stepper
from ultrasonicdriver import HCSR04
from time import sleep

Stepper = Stepper(5, 17, 0, 1)
us = HCSR04(23, 22)

opened = 0


while True:
    if us.get_distance_cm() < 50 and opened == 0:
        Stepper.steps(5*200)
        opened = 1
    elif us.get_distance_cm() > 50 and opened == 1:
        Stepper.steps(-5*200)
        opened = 0


    sleep(.01)