text: import RPi.GPIO as GPIO
  import time
  import sys
  import os
  
  # Pin 33, 29, 31, 32
  
  GPIO.setmode(GPIO.BOARD)
  
  StepPins = [33, 29, 31, 32]
  
  total = 0
  for pin in StepPins:
      GPIO.setup(pin, GPIO.OUT)
      GPIO.output(pin, False)
  
  Seq = [ [0,1,1,0],
          [0,0,1,0],
          [1,0,1,0],
          [1,0,0,0],
          [1,0,0,1],
          [0,0,0,1],
          [0,1,0,1],
          [0,1,0,0]]
  
  Reverse = [ [0,1,0,0],
              [0,1,0,1],
              [0,0,0,1],
              [1,0,0,1],
              [1,0,0,0],
              [1,0,1,0],
              [0,0,1,0],
              [0,1,1,0]]
  
  StepCount = len(Seq)
  StepDir = 1
  
  if len(sys.argv)>1:
      WaitTime = int(sys.argv[1])/float(1000)
  else:
      WaitTime = 10/float(1000)
  
  StepCounter = 0
  
  while True:
  
      for pin in range(0,4):
          xpin = StepPins[pin]
          if (Seq[StepCounter][pin] != 0):
              GPIO.output(xpin, True)
              total = total + 1
          else:
              GPIO.output(xpin, False)
  
      StepCounter += StepDir
      if (StepCounter >= StepCount):
          StepCounter = 0
      if(StepCounter < 0):
          StepCounter = StepCounter + StepDir
      
      if total == 150:
          break
      else:
          time.sleep(WaitTime)
  
  