from machine import *
from time import *

trig=Pin(12,Pin.OUT)
echo=Pin(14,Pin.IN)

while True:
    trig.off()
    sleep_us(2) #2us delay
    trig.on()
    sleep_us(10) #10us delay
    trig.off()

    while echo.value()==0:
        pulse_start=ticks_us()
    while echo.value()==1:
       pulse_end=ticks_us() # microseconds

    pulse_duration=ticks_diff(pulse_end,pulse_start)
    distance=pulse_duration*0.0343/2
    print('Distance: {:.2f} cm'.format(distance))
    
    sleep(1)