from hcsr04 import HCSR04
import machine
from machine import Pin
import time
from time import sleep

led=Pin(2, Pin.OUT)

sensor=HCSR04(trigger_pin=13, echo_pin=12, echo_timeout_us=10000)

while True:
    Distance = sensor.distance_cm()
    print('Distance: ', Distance, 'cm')
    if Distance < 50:
        led.on()
    else:
        led.off()
    time.sleep(1)