from machine import Pin
import machine
import time

trigger=Pin(23,Pin.OUT)
echo=Pin(34,Pin.IN)

while True:
    trigger.value(0)
    time.sleep_us(1)
    trigger.value(1)
    time.sleep_us(10)
    trigger.value(0)
    totaltime=machine.time_pulse_us(echo,1)
    distance=(totaltime*0.034)/2
    print("Distance : ",int(distance),"cm")
    time.sleep(2)