from machine import Pin
from utime import sleep

bombillo = Pin(4, Pin.OUT)
bombillo2 =Pin(0, Pin.OUT)
bombillo3 =Pin(2, Pin.OUT)
while True: 
    bombillo.on()
    sleep(1)
    bombillo.off()
    bombillo2.on()
    sleep(1)
    bombillo2.off()
    bombillo3.on()
    sleep(1)
    bombillo3.off()
    sleep(1)
    bombillo2.on()
    sleep(1)
    bombillo2.off()