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

sensor = HCSR04(trigger_pin=25, echo_pin=18)
led = Pin(26,Pin.OUT)

while True:
    distance = sensor.distance_cm()
    if (distance<200):
        led.value(1)
    else:
        led.value(0)
    sleep(0.1) 
    print(distance)