from machine import Pin
import time

trig = Pin(3, Pin.OUT)
echo = Pin(2, Pin.IN)

start_time = time.ticks_ms()

while True:

    current_time = time.ticks_ms()
    delta_time = time.ticks_diff(current_time, start_time)

    trig.value(0)
    time.sleep(0.1)
    trig.value(1)
    time.sleep_us(10)
    trig.value(0)
    while echo.value()==0:
        pulse_start = time.ticks_us()
    while echo.value()==1:
        pulse_end = time.ticks_us()
    timepassed = pulse_end - pulse_start
    distance = (timepassed * 0.0343) / 2
    print ('Distance:',"{:.0f}".format(distance * 10),'mm')
    
    start_time = current_time