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

trig_pin = Pin(22, Pin.OUT)
echo_pin = Pin(19, Pin.IN)

c=0.034 #speed of sound in cm/us

while True:
    
    trig_pin.value(0)
    sleep_us(2)

    # trigger the sensor
    trig_pin.value(1)
    sleep_us(10)

    # stop trigger
    trig_pin.value(0)

    #echo_pin becomes 1, and again 0 when receives an echo

    # measure the time delay
    delay_us = time_pulse_us(echo_pin, 1)
    
    # calculate the distance based on the duration
    distance_cm = c * delay_us / 2
    
    print("Distance:", distance_cm, "cm")
    
    sleep(1)