from machine import Pin 
import utime
PORT=[7,6,5,4,3,2,1,0]
L=[0]*8
def Configure_port():
    for i in range(0,8):
        L[i]=Pin(PORT[i],Pin.OUT)
    return
 
def Port_Output(x):
    b=bin(x)
    b=b.replace("0b","")
    diff=8-len(b)
    for i in range(0,diff):
        b="0"+b
    for i in range(0,8):
        if b[i]=="1":
            L[i].value(1)
        else:
            L[i].value(0)
    return
Configure_port()
cnt=0
while True:
    Port_Output(cnt)
    utime.sleep(1)
    cnt=cnt+1
    if cnt>255:
        cnt=0