from machine import Pin
import utime 
trigger=Pin(2,Pin.OUT)
Echo=Pin(3,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()
        print("signalon",signalon)
    timepassed=signalon-signaloff
    distance=(timepassed*0.0343)/2
while True:
    ultra()
    utime.sleep(1)