from time import sleep
from machine import Pin
import uasyncio

sleep(0.1) # Wait for USB to become ready

led_1 = Pin(4, Pin.OUT)
led_2 = Pin(2, Pin.OUT)

async def tarea(led, tiempo):
    while True:
        led.value(1)
        await uasyncio.sleep(tiempo)  # Encendido durante la mitad del periodo
        led.value(0)
        await uasyncio.sleep(tiempo)

async def main():
    uasyncio.create_task(tarea(led_1, .5))
    uasyncio.create_task(tarea(led_2, 2))
    while True:
        await uasyncio.sleep(1)

uasyncio.run(main())