from machine import pin
import utime
trigger = pin(3, pin.ot)
echo = pin(2,pin.In)
def ultra ():
    trigger.low()
    utime.sleep_us(2)
    trigger.high()
    utime.sleep_us(5)
    trigger.low()
    while echo.value() == 0:
        signaloff = utime.ticks_us()
    while echo.value() == 1:
        signalon = utime.ticks_us()
    timepassed = signalon - signaloff
    distance = (timepassed * 0.30330) / 2
    print("the distance from object is ",distance,"cm")
while true:
    ultra()
    utime.sleep(1)