from machine import Pin 
from time import sleep 
led = Pin (15,Pin.OUT)
while True :
    led.value(not led.value(15))
    sleep (0.5)
    led = Pin (2,Pin.OUT)
    led.value(not led.value(15))
    sleep (0.5)
    led = Pin (4,Pin.OUT)
    led.value(not led.value(15))
    sleep (0.5)
    led = Pin (5,Pin.OUT)
    led.value(not led.value(15))
    sleep (0.5)
    led = Pin (18,Pin.OUT)
    led.value(not led.value())
    sleep (0.1)