Schrittmotor in 2 Richtungen Bewegen

#!/usr/bin/python
import RPi.GPIO as GPIO
import time
import sys
P_A1 = 18  # adapt to your wiring
P_A2 = 23 # ditto
P_B1 = 24 # ditto
P_B2 = 25 # ditto
delay = 0.005 # time to settle
wahl = (sys.argv[1])
def setup():
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)
    GPIO.setup(P_A1, GPIO.OUT)
    GPIO.setup(P_A2, GPIO.OUT)
    GPIO.setup(P_B1, GPIO.OUT)
    GPIO.setup(P_B2, GPIO.OUT)

def forwardStep():
    setStepper(1, 0, 1, 0)
    setStepper(0, 1, 1, 0)
    setStepper(0, 1, 0, 1)
    setStepper(1, 0, 0, 1)

def backwardStep():
    setStepper(1, 0, 0, 1)
    setStepper(0, 1, 0, 1)
    setStepper(0, 1, 1, 0)
    setStepper(1, 0, 1, 0)
  
def setStepper(in1, in2, in3, in4):
    GPIO.output(P_A1, in1)
    GPIO.output(P_A2, in2)
    GPIO.output(P_B1, in3)
    GPIO.output(P_B2, in4)
    time.sleep(delay)

setup()
test = 0
# 512 steps for 360 degrees, adapt to your motor
while (test == 0):
    
    for i in range(15):
        if (wahl == "back"):
            backwardStep() 
            print "back"
            test = 1
        if (wahl == "forward"):
            forwardStep() 
            test = 1
            print "forward"