from machine import Pin
from time import sleep_us, sleep, ticks_us

trig = Pin(2, Pin.OUT)
echo = Pin(15, 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)