from machine import Pin
import time

led_pins = [Pin(22, Pin.OUT), 
            Pin(26, Pin.OUT), 
            Pin(27, Pin.OUT)]

def set_leds(value):
    for i in range(3):
        led_pins[i].value((value >> i) & 1)

counter = 0

while True:
    set_leds(counter)
    counter = (counter + 1) % 8  
    time.sleep(1)