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Date: Tue, 21 Apr 2015 14:28:02 -0400
Message-ID: <CAOFvGD7cf+csGuCJix3RHLp_4+V7S6mf9GG6ebnYs_A+F2UOHQ@mail.gmail.com>
Subject: Re: [geda-user] Stepper driver issues
From: Jason White <whitewaterssoftwareinfo AT gmail DOT com>
To: geda-user AT delorie DOT com
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Are you able to make the stepper motor spin by manually applying
voltage to each coil to step through the phases? If you can't make it
work by hand (following the correct stepping sequence) then I'd blame
the stepper.

Do you have any verified working steppers to serve as a reference? If
you have a good servo which spins when properly driven by hand, then
perhaps there would be some issue with the circuit. (Correct voltages?
Current driving ability? Stepping too fast? Loose connection/bad
wiring harness? etc...)

Lets us know once you have verified your stepper to be functional.

On Tue, Apr 21, 2015 at 1:47 PM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:
> I know this is a geda list and this question should be asked somewhere else
> but I'm homebound, I haven't worked with other engineers in years and this
> is the only place (and best place) I know of to hash a problem out with
> other engineers.  If anyone knows of a better forum please advise.
>
> I have a nema 23 stepper motor (to turn a trolling motor for a kayak) I want
> to drive in bipolar 2 phase.  I'm using a Microchip 16f1939 with the On
> Semiconductor STK682 stepper motor driver.
>
> I have verified with a logic analyzer and oscilloscope that the output
> signals to the stepper are in the correct phases and the correct voltage
> level (I may be able to attach the screenshot).
> I know it is sketchy but I have 3 nema 23 steppers from ebay.
>
> What I'm looking for is advice on how to proceed.  I just spun a new board
> with the bare minimum circuitry to drive the stepper and this output did not
> turn the stepper.  The two choices I see are purchasing another stepper from
> a reputable dealer or purchasing a ready-made stepper driver and associated
> accessories to drive the steppers then analyze the difference between output
> signals.
>
> Suggestions?  Advice?
>
> Thanks,
> Rob


-- 
Jason White