I'm using the standard Stepper.h library to drive two 28BYJ-48 stepper motors with the standard ULN2003 driver module. Nothing fancy, and just rotating in one direction only. The quirk I found is that when I have two instances of "stepper" defined, the second motor runs backwards. Nothing different in the wiring or software and each motor, tested individually, runs correctly. Easy to work around by just changing the wire order, or the pin define order, or using negative step commands. Just thought someone might benefit by knowing this ahead of time.
I think this report needs some research and experimentation behind it to reveal the nature and extent of the phenomenon. You really only mentioned one configuration, that is not enough, and there is no attempt to find the root cause. It should be pushed back to the library maintainer, but first you must be sure it is not your own mistake.
If you want people to take it seriously in this thread, you need to post more details, like the code and schematic.
Also you should post a link to the library because there are really no "standard" libraries apart from the native ones like Wire.
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