import utime
trigger=pin(15,Pin.OUT)
echo=pin(14,Pin.IN)
while true:
    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()
    time Passed=signalon-signaloff
        distance=(time passed*0.0343)/2
    print("total distance",distance,"cm")
    print("sensor")
    utime.sleep(1)