NEMAStepper.py

import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(FALSE)

A=7
B=11
C=13
D=15

sleep_time = 0.01

def GPIO_SETUP(a, b, c, d):
    GPIO.output(A, a)
    GPIO.output(B, b)
    GPIO.output(C, c)
    GPIO.output(D, d)
    time.sleep(sleep_time)

def RIGHT_TURN(deg, step):

    GPIO_SETUP(0, 0, 0, 0)

    if step == "full":
        print"Fullstepping", deg, "Degrees"

    if step == "half":
        print"Halfstepping", deg, "Degrees"

    while deg > 0.0:
        if step == "half":
            GPIO_SETUP(1,0,0,1)
            GPIO_SETUP(1,0,0,0)
            GPIO_SETUP(1,1,0,0)
            GPIO_SETUP(0,1,0,0)
            GPIO_SETUP(0,1,1,0)
            GPIO_SETUP(0,0,1,0)
            GPIO_SETUP(0,0,1,1)
            GPIO_SETUP(0,0,0,1)
            print "Degree left", deg
            deg = deg -1.0

        if step == "full":
            GPIO_SETUP(1,0,0,0)
            GPIO_SETUP(0,1,0,0)
            GPIO_SETUP(0,0,1,0)
            GPIO_SETUP(0,0,0,1)
            print "Degree left", deg
            deg = deg -1.0

RIGHT_TURN(90, "full")

GPIO.cleanup()