from  machine import  Pin
from time import sleep_us,sleep,ticks_us
trig=Pin(15,Pin.OUT)
echo=Pin(2,Pin.IN)
while True:
    distance=0
    trig.value(1)
    sleep_us(10)
    trig.value(0)
    while echo.value()==0:
        pass
    if echo.value()==1:
        ts=ticks_us()
        while echo.value()==1:
            pass
        te=ticks_us()
        tc=te-ts
        distance=(tc*170)/10000
    print(distance,'cm')
    sleep(1)