import board
import digitalio
import time

#DEFINE LOS LEDS
led_pins = [
    board.GP0, board.GP1, board.GP2, board.GP3, 
    board.GP4, board.GP5, board.GP6, board.GP7
]

#CONFIGURA LOS LEDS COMO SALIDAS DIGITALES
leds = [digitalio.DigitalInOut(pin) for pin in led_pins]
for led in leds:
    led.direction = digitalio.Direction.OUTPUT

#FUNCION QUE ACTUALIZA EL VALOR DEL CONTADOR BINARIO DE 8 BITS
def update_leds(counter):
   for i in range (8):
    leds[i].value = (counter >> i) & 0b01

#PROGRAMA PRINCIPAL    
counter = 0

for counter in range (0, 256):
    update_leds(counter)
    time.sleep(0.039)
#    counter = (counter + 1) % 256
    print (counter)
counter = 0
update_leds(counter)