from machine import Pin
import utime
trig = Pin(2,Pin.OUT)
echo = Pin(3,Pin.IN)
trig.value(0)

while True:
    trig.value(1)
    utime.sleep_us(10)
    trig.value(0)
    t1 = utime.ticks_us()
    while echo.value() == 0:
        t1 = utime.ticks_us()
    while echo.value() == 1:
        t2 = utime.ticks_us()
    t = t2-t1
    d = t/59 
    print("Objetivo a: ",d, "cm")
    utime.sleep(1)