from hcsr04 import HCSR04
from time import sleep

sensor = HCSR04(
    trigger_pin=5,
    echo_pin=18,
    echo_timeout_us=30000
)

while True:
    try:
        distance = sensor.distance_cm()
        print('Distance:', distance, 'cm')

    except OSError as e:
        print('Out of range')

    sleep(1)