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#      :kdddxxxxd,  ,lolccldxxxkkOOOkkkko,
#       lOkxkkk;  :xkkkkkkkkOOO000OOkkOOk.
#        ;00Ok' 'O000OO0000000000OOOO0Od.
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#
# Author: peppe8o
# Blog: https://peppe8o.com
# Date: Aug 26th, 2021
# Version: 1.0

from machine import Pin
import utime
import random

#define PINs according to cabling
dataPIN = 13
latchPIN = 15
clockPIN = 14

#set pins to output PIN objects
dataPIN=Pin(dataPIN, Pin.OUT)
latchPIN=Pin(latchPIN, Pin.OUT)
clockPIN=Pin(clockPIN, Pin.OUT)

#define shift register update function
def shift_update(input,data,clock,latch):
  #put latch down to start data sending
  clock.value(0)
  latch.value(0)
  clock.value(1)
  
  #load data in reverse order
  for i in range(7, -1, -1):
    clock.value(0)
    data.value(int(input[i]))
    clock.value(1)

#put latch up to store data on register
  clock.value(0)
  latch.value(1)
  clock.value(1)

#main program, calling shift register function
bit_string="00000000"

while True:
    shift_update(bit_string,dataPIN,clockPIN,latchPIN)
    bit_string = str(random.randint(0, 1))+bit_string[:-1]
    utime.sleep(0.3)