from machine import Pin
import time

D0=Pin(2,Pin.OUT)
D1=Pin(0,Pin.OUT)
D2=Pin(4,Pin.OUT)
D3=Pin(16,Pin.OUT)
D4=Pin(17,Pin.OUT)
D5=Pin(5,Pin.OUT)
D6=Pin(18,Pin.OUT)
D7=Pin(19,Pin.OUT)

LEDS=[D0,D1,D2,D3,D4,D5,D6,D7]

gray=[3,15,63,255]

def PORT(dat):
    lista_string=list(f"{dat:08b}")
    lista_entero=list(map(int,lista_string))
    
    for i in range(8):
        LEDS[i].value(lista_entero[i])


while True:

    for i in range(4):
        PORT(gray[i])
        time.sleep(1)

    for i in range(3,-1,-1):
        PORT(gray[i])
        time.sleep(1)

    PORT(0)
    time.sleep(1)