import time
from machine import Pin
from shift_register_bitbang import ShiftRegister

# define PINs
data_pin = Pin(5, Pin.OUT)
latch_pin = Pin(18, Pin.OUT)
clock_pin = Pin(19, Pin.OUT)
units_595 = 5

# PINs output state after HIGHT

#print(pins_mask ^ pin)

shift_register = ShiftRegister(data_pin, clock_pin, latch_pin )

light = False

while 1:
    light = not light
    for _ in range(8 * units_595):
        shift_register.bit(light)
        shift_register.latch()
        time.sleep(0.05)