28BYJ-48 5-Volt Stepper

system · November 30, 2012, 8:46pm

Here it is at last! With new features. Will update Gist from now on.

gist.github.com

https://gist.github.com/sbright33/4178431

stepper2.ino

// This Arduino example demonstrates bidirectional operation of a 
// 28BYJ-48, which is readily available on eBay for $4.25 inc shipping,
// using a ULN2003 interface board to drive the stepper. The 28BYJ-48 
// motor is a 4-phase, 8-beat motor, geared down by a factor of 64. One 
// bipolar winding is on motor pins 1,3 and the other on motor pins 2,4. 
// Refer to the manufacturer's documentation of Changzhou Fulling 
// Motor Co., Ltd., among others.  The step angle is 5.625/64 and the 
// operating Frequency is 100pps. Current draw is 92mA.  
// Vin w USB power is 4.5v too slow for testing use 5v pin.
//#include <Narcoleptic.h>

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stepper2.txt

Includes ability to step less than step size without losing track of total.  
Detect torque spike when you get to end of travel.  
Turns off coils between steps for motor with gears that do not need holding torque.  
Cooler running with 12v.  
Can sleep when moving slow.  
Ramping.  
Non-blocking.  
Enhanced performance using 12v supply with 5v motor.

Here's a summary and some help to get you started:

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Please...
Questions? Comments? Requests for new features? Improvements?
Thanks for looking at my code!
Steve

As a learning exercise or tutorial feel free to check out the older version, which is now obsolete.
https://gist.github.com/4149982

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28BYJ-48 5-Volt Stepper

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