#importar modulos base 
from machine import Pin
from time import sleep

#Drive del sensor
from hcsr04 import HCSR04

led1 = Pin(12, Pin.OUT)  # Verde
led2 = Pin(16, Pin.OUT)  # Amarillo
led3 = Pin(17, Pin.OUT)  # Rojo

#Objeto de control del sensor
sensor = HCSR04(15, 4)

#Ciclo infinito
while True:
    distancia = sensor.distance_cm()
    print(f"Distancia del objeto: {distancia:.1f} cm.")
    sleep(1)

    if distancia < 20:
        print("cerca")  
        led1.off()  
        led2.off()  
        led3.on()   
    elif distancia < 50:  
        print("medio")  
        led1.off()  
        led2.on()   
        led3.off()  
    else:
        print("lejos")  
        led1.on()  
        led2.off()  
        led3.off()
sleep(1)