from machine import Pin
import utime
trig = Pin (28, Pin. OUT)
echo = Pin (27, Pin. IN)

def read():
    trig.low()
    utime.sleep_us (2)

    trig.high()
    utime.sleep_us(5)
    trig.low()

    while echo.value()==0:
        time0ff = utime.ticks_us()
    while echo.value()==1:
        timeOn = utime.ticks_us()

    time = timeOn - time0ff
    distance = (time * 0.043)/2
    return distance
while True:
     print ("Distancia es:", read (), "cm")
     utime.sleep (1)