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#
# Author: peppe8o
# Date: Feb 24th, 2020
# version: 1.2

# Import required libraries
import sys
import time
import RPi.GPIO as GPIO

# define variables
chan_list = [17,27,22,23] # GPIO ports to use
delay=.001 # delay between each sequence step

# Use BCM GPIO references
# instead of physical pin numbers
GPIO.setmode(GPIO.BCM)

# Set all pins as output
for pin in chan_list:
  print("Setup pins")
  GPIO.setup(pin,GPIO.OUT)

#initialize array for sequence shift
arr1 = [1,1,0,0]
arr2 = [0,1,0,0]

def move():
  global arr1 # enables the edit of arr1 var inside a function
  global arr2 # enables the edit of arr2 var inside a function
  arrOUT = arr1[1:]+arr1[:1] # rotates array values of 1 digit
  arr1 = arr2
  arr2 = arrOUT
  GPIO.output(chan_list, arrOUT)
  time.sleep(delay)

# Start main loop
while True:
  try:
   move()
  except KeyboardInterrupt:
    GPIO.output(chan_list, (0,0,0,0))
    GPIO.cleanup()
    sys.exit()