from machine import  *
from utime import sleep


l1= Pin (1,Pin.OUT)
l2= Pin (5,Pin.OUT)
l3= Pin (9,Pin.OUT)


while True:
    l1.on()
    sleep(2)
    l1.off()


    l2.on()
    sleep(2)
    l2.off()


    l3.on()
    sleep(2)
    l3.off()