from machine import Pin, time_pulse_us
import time

TRIG = Pin(3, Pin.OUT)
ECHO = Pin(2, Pin.IN)

while True:
    TRIG.low()
    time.sleep_us(2)
    TRIG.high()
    time.sleep_us(10)
    TRIG.low()

    duration = time_pulse_us(ECHO, 1)
    distance = (duration * 0.0343) / 2
    print("Distance:", distance, "cm")
    time.sleep(1)