import time
import machine
from machine import Pin

time.sleep(0.1) # Wait for USB to become ready


tasteri = [ Pin(i, Pin.IN) for i in range(4) ]
leds = [ Pin(i, Pin.OUT) for i in range(4, 12) ]

count = 0
while (True):
    if (tasteri[0].value()):
        count = (count + 1) % 256
    elif (tasteri[1].value()):
        count = (count - 1) % 256
    elif (tasteri[2].value()):
        count = 255
    elif (tasteri[3].value()):
        count = 0

    binar = "{0:08b}".format(count)
    for i in range(8):
        leds[i].value(int(binar[i]))
    
    time.sleep(0.2)