I want to move a motor with raspberry pi... here is my work I followed this example enter image description here

This is my raspberry pi 3 model b v1.2

import RPi.GPIO as GPIO
import time

coil_A_1_pin = 4 # pink
coil_A_2_pin = 17 # orange
coil_B_1_pin = 23 # blue
coil_B_2_pin = 24 # yellow
// adjust if different
StepCount = 8
Seq = range(0, StepCount)
Seq[0] = [0,1,0,0]
Seq[1] = [0,1,0,1]
Seq[2] = [0,0,0,1]
Seq[3] = [1,0,0,1]
Seq[4] = [1,0,0,0]
Seq[5] = [1,0,1,0]
Seq[6] = [0,0,1,0]
Seq[7] = [0,1,1,0]

GPIO.setup(enable_pin, GPIO.OUT)
GPIO.setup(coil_A_1_pin, GPIO.OUT)
GPIO.setup(coil_A_2_pin, GPIO.OUT)
GPIO.setup(coil_B_1_pin, GPIO.OUT)
GPIO.setup(coil_B_2_pin, GPIO.OUT)

GPIO.output(enable_pin, 1)

def setStep(w1, w2, w3, w4):
GPIO.output(coil_A_1_pin, w1)
GPIO.output(coil_A_2_pin, w2)
GPIO.output(coil_B_1_pin, w3)
GPIO.output(coil_B_2_pin, w4)

def forward(delay, steps):
for i in range(steps):
    for j in range(StepCount):
        setStep(Seq[j][0], Seq[j][1], Seq[j][2], Seq[j][3])

def backwards(delay, steps):
for i in range(steps):
    for j in reversed(range(StepCount)):
        setStep(Seq[j][0], Seq[j][1], Seq[j][2], Seq[j][3])

if __name__ == '__main__':
while True:
    delay = raw_input("Time Delay (ms)?")
    steps = raw_input("How many steps forward? ")
    forward(int(delay) / 1000.0, int(steps))
    steps = raw_input("How many steps backwards? ")
    backwards(int(delay) / 1000.0, int(steps))

i got this error :

"Traceback (most recent call last):
File "stepper.y", line 23, in <module>
GPIO.setup(enable_pin, GPIO.OUT)
NameError: name 'enable_pin' is not defined"
  • 1
    There is no variable enable_pin . did you forget to declare it or did the code you copied have this variable – Steve Robillard Jul 2 '17 at 0:05
  • can you give me an example please? – Eduardo Herrera Jul 2 '17 at 0:11
  • an example of what a variable? – Steve Robillard Jul 2 '17 at 0:12
  • @eduardo2207fromPanama: This is your code.... Why would you need an example from us? The error is very clear. You are trying to use a variable (enable_pin) that doesn't exist. – Jacobm001 Jul 4 '17 at 3:17

Edit : this answer is working for the ULN2803A chip, question has been edited since for another chip.

enable_pin definition is missing in your code. Something like this may have been added just after the import section to solve the issue : enable_pin=18

A better solution is to remove the :
GPIO.setup(enable_pin, GPIO.OUT) and
GPIO.output(enable_pin, 1) lines, as this pin is not connected with the ULN2803A chip.

This pin configuraton was only provided in the adafruit tutorial for compatibility with other stepper chips.

| improve this answer | |
  • this not helped me – Eduardo Herrera Jul 2 '17 at 5:14
  • Applying one of these 2 solutions will surely change the error message. If you face another error message, please make another question :) – Technico.top Jul 2 '17 at 9:46
  • If you still have the same error message, it's may be because you had a problem while writing to the file (permission issue ?). – Technico.top Jul 2 '17 at 9:53

It seems the chip you are using : L293D is not the one in the shematic you provided.

You need to connect your components like this : enter image description here https://learn.adafruit.com/adafruits-raspberry-pi-lesson-10-stepper-motors/hardware-l293d

With this chip, you also need to define the enable_pin in your code. Add this just after the import section:
And everything will go fine :)

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