from machine import Pin
from time import sleep

led1 = Pin(21,Pin.OUT)
led2 = Pin(20,Pin.OUT)
led3 = Pin(19,Pin.OUT)
led4 = Pin(18,Pin.OUT)
led5 = Pin(17,Pin.OUT
led6= Pin(16,Pin.OUT)
led7= Pin(15,Pin.OUT)
led8= Pin(14,Pin.OUT)

while True:
    for i in range(16):
        led1.value(i%2)
        led2.value(int((i/2)%2))
        led3.value(int((i/4)%2))
        led4.value(int((i/8)%2))
        led5.value(int((i/8)%2))
        led6.value(int((i/8)%2))
        led5.value(int((i/8%2))


        )
        print(i)
        sleep(1)