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

sensor = HCSR04(trigger_pin=5, echo_pin=4, echo_timeout_us=10000)
buzzer=Pin(21,Pin.OUT)
ledrouge=Pin(23,Pin.OUT)
while True:
    distance = sensor.distance_cm()
    print('Distance=', distance, 'cm')
    sleep(2)
    if distance<5:
        ledrouge.on()
        buzzer.on()
    else:
        ledrouge.off()
        buzzer.off()