Stepper Motor and ULN2003

Description

A stepper motor is a motor where the turning can be controlled in steps.

Our motor has about 508 steps for 360° (the motor itself has 64 steps but there is a gear train on top)

more details:

• http://www.jangeox.be/2013/10/stepper-motor-28byj-48_25.html
• https://cookierobotics.com/042/
• see https://github.com/zhcong/ULN2003-for-ESP32

ULN2003 driver module.

How to connect it electrically

Required Module and Files

• We use Stepper.py
• this is downloaded from https://github.com/zhcong/ULN2003-for-ESP32
• the original file is at https://github.com/zhcong/ULN2003-for-ESP32/blob/master/Stepper.py
• this is based on: https://github.com/IDWizard/uln2003 by (c) IDWizard 2017,MIT License.

How to control it in MicroPython

 1 import Stepper
 2 from machine import Pin
 3 
 4 In1 = Pin(32,Pin.OUT)
 5 In2 = Pin(33,Pin.OUT)
 6 In3 = Pin(25,Pin.OUT)
 7 In4 = Pin(26,Pin.OUT)
 8 
 9 s1 = Stepper.create(In1,In2,In3,In4, delay=10)
10 
11 s1.step(509,-1)
12 
13 s1 = Stepper.create(In1,In2,In3,In4, delay=1)
14 
15 s1.step(509)