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	Tue, 21 Apr 2015 10:47:58 -0700 (PDT)
Date:	Tue, 21 Apr 2015 13:47:57 -0400
Message-ID:	<CALSZ9goH9CUT=5DStdVUG4d45ff30WieHc2-DsXpjX=7cf42Nw@mail.gmail.com>
Subject:	[geda-user] Stepper driver issues
From:	Rob Butts <r DOT butts2 AT gmail DOT com>
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com

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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).
=E2=80=8B
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

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<div dir=3D"ltr"><div>I know this is a geda list and this question=C2=A0sho=
uld be=C2=A0asked somewhere else but I&#39;m homebound, I haven&#39;t worke=
d 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.=C2=A0 If anyone know=
s of a better forum please advise.</div><div><br></div><div>I have a nema 2=
3 stepper motor (to turn a trolling motor for a kayak)=C2=A0I want to drive=
 in bipolar 2 phase.=C2=A0 I&#39;m using a Microchip 16f1939 with the=C2=A0=
On Semiconductor STK682 stepper motor driver.=C2=A0 </div><div><br></div><d=
iv>I have verified with a logic analyzer and oscilloscope that the output s=
ignals to the stepper are in the correct=C2=A0phases and the correct voltag=
e level (I may be able to attach the screenshot).<br>=E2=80=8B</div><div>I =
know it is sketchy but I have 3 nema 23 steppers from ebay.</div><div><br><=
/div><div>What I&#39;m looking for is advice on how to proceed.=C2=A0 I jus=
t spun a new board with the bare minimum circuitry to drive the stepper and=
 this output did not turn the stepper.=C2=A0 The two choices I see are purc=
hasing another stepper from a reputable dealer or purchasing a ready-made s=
tepper driver and associated accessories to drive the steppers then analyze=
 the difference between output signals.</div><div><br></div><div>Suggestion=
s?=C2=A0 Advice?</div><div><br></div><div>Thanks,</div><div>Rob</div></div>

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