from machine import Pin, Timer
import utime

timer = Timer ()
trigger = Pin(16, Pin.OUT)
echo = Pin(17, Pin.IN)
led = Pin(18, Pin.OUT)
distancia = 0

def sensor_ult(timer):
    global distancia
    trigger.low()
    utime.sleep_us(2)
    trigger.high()
    utime.sleep_us(5)
    trigger.low()

    while echo.value() == 0:
        start = utime.ticks_us ()
    while echo.value == 1:
        end = utime.ticks_us()
    
    Duration = end - start
    distancia = (Duration * 0.0343)/2
    print("Distancecm: ", distancia, "cm")

    timer.init(freq=1, mode= timer.PERIODIC, callback=sensor_ult)
    While True:
    if Distancecm <= 10:
        led.value(1)
    else:
        led.value (0)