from hcsr04 import HCSR04
from time import sleep
from machine import Pin
sensor = HCSR04(trigger_pin=5, echo_pin=4, echo_timeout_us=10000)

led_1 = Pin(22, Pin.OUT) # broche 22 en sortie
buzz=Pin(21, Pin.OUT)
while True:
    
    distance = sensor.distance_cm()
    print('Distance=', distance, 'cm')
    sleep(0.4)
    if(distance<20):
        led_1.value(1) # allume la LED1
        buzz.value(1)
    else:
        led_1.value(0) # allume la LED1
        buzz.value(0)