from machine import Pin
from hcsr04 import HCSR04
from time import sleep

meter = HCSR04 (trigger_Pin = 4, echo_Pin = 5)
led = Pin (2, Pin.OUT)

while (True):
    try:
        distance = meter.distance_cm()
        print("Distance = ",distance, "cm" ) 
        if distance >= 20:
            led.value(1)
            print("movement detected")
        else:
            led.value(0) 
            print("no movement detected")  
        sleep(1)     
    except:
        print("Error")