from machine import Pin
from time import sleep


while True:
    for i in range(10, 0, -1):
        led = Pin(i, Pin.OUT)
        led.value(1)
        sleep(0.2)

    sleep(0.5)

    for i in range(10, 0, -1):
        led = Pin(i, Pin.OUT)
        led.value(0)

    sleep(1)