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= IMPORTANT =
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see https://github.com/zhcong/ULN2003-for-ESP32
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'''In many computers the current is not enough to drive the servo!!!'''
 
  
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'''If it does not work, keeps disconnecting, or rebooting the ESP the power is not sufficent and you need an extra power supply.'''
 
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See [[SG90 Servo#Power Issues]] and the video on the [[SG90 Servo]] page for details how to do this.
 
  
 
= Description =
 
= Description =
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Our motor has about 508 steps for 360° (the motor itself has 64 steps but there is a gear train on top)
 
Our motor has about 508 steps for 360° (the motor itself has 64 steps but there is a gear train on top)
  
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more details:
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[[File:Stepper03.JPG|300px]]
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* http://www.jangeox.be/2013/10/stepper-motor-28byj-48_25.html
 
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* https://cookierobotics.com/042/
 
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* see https://github.com/zhcong/ULN2003-for-ESP32
 
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[[File:Stepper.JPG|x300px]]
 
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[[File:Stepper03.JPG|x300px]]
 
  
 
ULN2003 driver module.
 
ULN2003 driver module.
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[[File:Stepper02.JPG|300px]]
 
[[File:Stepper02.JPG|300px]]
  
 
= How to connect it electrically =
 
= How to connect it electrically =
  
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[[File:Stepper-c.JPG|x250px]]
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[[File:Stepper-cables01.JPG|x200px]]
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[[File:Elko-stepper.JPG|x250px]]
 
  
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We recommend to add the capacitor to keep the power supply more stable. This issue is similar to the power issue with the servo [[SG90 Servo]].
 
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[[File:Stepper-cables01.JPG|x200px]]
 
 
[[File:Stepper-cable02.JPG|x200px]]
 
[[File:Stepper-cable02.JPG|x200px]]
  
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= Required Module and Files =
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== Required Module and Files ==
 
* We use '''[https://www.sketching-with-hardware.org/files/Stepper.py Stepper.py]'''
 
* We use '''[https://www.sketching-with-hardware.org/files/Stepper.py Stepper.py]'''
 
* this is downloaded from https://github.com/zhcong/ULN2003-for-ESP32
 
* 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
 
* 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.
 
* this is based on: https://github.com/IDWizard/uln2003 by (c) IDWizard 2017,MIT License.
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= How to control it in MicroPython =
 
= How to control it in MicroPython =
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from machine import Pin
 
from machine import Pin
  
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# for the ESP8266
 
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# In1 = Pin(2,Pin.OUT) # IN1-> GPIO2
 
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# In2 = Pin(0,Pin.OUT) # IN1-> GPIO0
 
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# In3 = Pin(4,Pin.OUT) # IN1-> GPIO4
 
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# In4 = Pin(5,Pin.OUT) # IN1-> GPIO5
 
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# for ESP32
 
 
In1 = Pin(32,Pin.OUT)
 
In1 = Pin(32,Pin.OUT)
 
In2 = Pin(33,Pin.OUT)
 
In2 = Pin(33,Pin.OUT)
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s1.step(509)
 
s1.step(509)
 
</syntaxhighlight>
 
</syntaxhighlight>
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= Related Tutorial Videos =
 
= Related Tutorial Videos =
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<youtube>EIwjeek5hnM</youtube>
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<youtube>PEKjvD1uQe4</youtube>
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<!-- <youtube>PEKjvD1uQe4</youtube> -->
 

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