from machine import  Pin, time_pulse_us
from time import sleep, sleep_us

ledr= Pin (15, Pin.OUT)
leda= Pin (14, Pin.OUT)
ledv= Pin (13, Pin.OUT)

trig = Pin (12, Pin.OUT)
echo = Pin (11, Pin.IN)

def medir_distancia ():
    trig.low()
    sleep_us(2)

    trig.high()
    sleep_us(10)
    
    trig.low()

    try: 
        duracion = time_pulse_us (echo, 1, 30000)
        distancia = duracion / 58.0 
        return distancia

    except: 
        return None

while True:

    distancia = medir_distancia()

    if distancia <= 80:
        ledr.value (1)
        leda.value (0)
        ledv.value (0)

        print ("PELIGRO |", distancia, "cm")

    elif distancia <= 200:
        ledr.value (0)
        leda.value (1)
        ledv.value (0)

        print ("PPRECAUCION |", distancia, "cm")

    else:
        ledr.value (0)
        leda.value (0)
        ledv.value (1)

        print ("SEGURO |", distancia, "cm")

        sleep (0.1)