from machine import Pin 
from time import sleep 
from HC1SR04 import HCSR04

sensor = HCSR04(trigger_pin=5, echo_pin=18, echo_timeout_us = 23550)

led1 = Pin(15, Pin.OUT)
led2 = Pin(2, Pin.OUT)
led3 = Pin(0, Pin.OUT)
led4 = Pin(4, Pin.OUT)
while True:
    distancia = sensor.distance_cm()

    print ("la distancia es: ", distancia, "cm")

    if distancia <= 100:
        led1.on()
    elif distancia <= 200:
        led1.on()
        led2.on()
    elif distancia <= 300:
        led1.on()
        led2.on()
        led3.on()
    elif distancia <= 400:
        led1.on()
        led2.on()
        led3.on()
        led4.on()

    sleep(2)