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Date: Sun, 28 Jun 2015 14:09:50 -0400
Message-ID: <CALSZ9grMXe5Qe5R9ji8j=fkHA4_uh5qn8JGkt1=5+uwnaRor7w@mail.gmail.com>
Subject: Re: [geda-user] Stepper driver issues
From: "Rob Butts (r DOT butts2 AT gmail DOT com)" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
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Sabin, thank you for reminding me about the current adjustment.  I knew
about that but in waiting for help to bread board it I forgot about that.

Now I have to wait again for help to try this.

On Sun, Jun 28, 2015 at 1:41 PM, Sabin Iacob (iacobs AT m0n5t3r DOT info) <
geda-user AT delorie DOT com> wrote:

> On 06/28/2015 07:43 PM, Rob Butts (r DOT butts2 AT gmail DOT com) wrote:
> > Sorry to keep hammering this stepper driver issue on the geda board
> > but my collaboration options are very limited.
> >
> > This kayak steering via a nema 23 stepper is driving me BONKERS!  I
> > had it working prior to last summer but then spent 4 months in the
> > hospital critical, got out, worked on the shifting code, now the
> > steering isn't working and I can't figure out for the life of me what
> > changed!
> >
> > To sum up: I am using the Pololu DRV8825 stepper driver that I set up
> > on a bread board with a microchip pic16f1937.  I have verified with an
> > usb logic analyzer that all the control signals to the drv8825 are
> > correctly programmed and that the output A+, A-, B+ and B- signals are
> > what they are supposed to be without the stepper connected.
> >
> > I then connected a new stepper and it made a soft whining sound but
> > did not turn.  I am certain it is wired correctly.  Now the stepper
> > does not appear to work.
>
>
> those drivers have adjustable output current ( there's a trim pot on the
> board - top left in this image:
> https://www.pololu.com/picture/view/0J4122 ); probably by default it's
> set to a low current (because it's safer - won't blow small steppers on
> the first try ;) )
>
> https://www.youtube.com/watch?v=3D89BHS9hfSUk
>
>
> > I am sure I ordered a 12V 2.0 A stepper but looking at the motor tag
> > it says 1.2V and 2A which probably explains why it didn't work and is
> > now not working.
>
>
> voltage is irrelevant for this, the current is the one generating a
> magnetic field and moving the rotor; try adjusting that trimpot with the
> thing running
>
>
> > Does anyone know of a good source for a nema 23 stepper motor?  The
> > drv8825 is rated for 2A and my kayak trolling motor is not difficult
> > to turn so I don't believe it needs to be high holding torque.
> >
> > Any help will be GREATLY appreciated!
> > =E2=80=8B
> > Thanks,
> > Rob
>
>
>

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<div dir=3D"ltr"><div>Sabin, thank you for reminding me about the current a=
djustment.=C2=A0 I knew about that but in waiting for help to bread board i=
t I forgot about that.<br><br></div>Now I have to wait again for help to tr=
y this.<br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
On Sun, Jun 28, 2015 at 1:41 PM, Sabin Iacob (<a href=3D"mailto:iacobs AT m0n5=
t3r.info">iacobs AT m0n5t3r DOT info</a>) <span dir=3D"ltr">&lt;<a href=3D"mailto:=
geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>&gt;</spa=
n> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><span class=3D"">On 06/28/2015 =
07:43 PM, Rob Butts (<a href=3D"mailto:r DOT butts2 AT gmail DOT com">r DOT butts2 AT gmail DOT c=
om</a>) wrote:<br>
&gt; Sorry to keep hammering this stepper driver issue on the geda board<br=
>
&gt; but my collaboration options are very limited.<br>
&gt;<br>
&gt; This kayak steering via a nema 23 stepper is driving me BONKERS!=C2=A0=
 I<br>
&gt; had it working prior to last summer but then spent 4 months in the<br>
&gt; hospital critical, got out, worked on the shifting code, now the<br>
&gt; steering isn&#39;t working and I can&#39;t figure out for the life of =
me what<br>
&gt; changed!<br>
&gt;<br>
&gt; To sum up: I am using the Pololu DRV8825 stepper driver that I set up<=
br>
&gt; on a bread board with a microchip pic16f1937.=C2=A0 I have verified wi=
th an<br>
&gt; usb logic analyzer that all the control signals to the drv8825 are<br>
&gt; correctly programmed and that the output A+, A-, B+ and B- signals are=
<br>
&gt; what they are supposed to be without the stepper connected.<br>
&gt;<br>
&gt; I then connected a new stepper and it made a soft whining sound but<br=
>
&gt; did not turn.=C2=A0 I am certain it is wired correctly.=C2=A0 Now the =
stepper<br>
&gt; does not appear to work.<br>
<br>
<br>
</span>those drivers have adjustable output current ( there&#39;s a trim po=
t on the<br>
board - top left in this image:<br>
<a href=3D"https://www.pololu.com/picture/view/0J4122" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.pololu.com/picture/view/0J4122</a> ); probably=
 by default it&#39;s<br>
set to a low current (because it&#39;s safer - won&#39;t blow small stepper=
s on<br>
the first try ;) )<br>
<br>
<a href=3D"https://www.youtube.com/watch?v=3D89BHS9hfSUk" rel=3D"noreferrer=
" target=3D"_blank">https://www.youtube.com/watch?v=3D89BHS9hfSUk</a><br>
<span class=3D""><br>
<br>
&gt; I am sure I ordered a 12V 2.0 A stepper but looking at the motor tag<b=
r>
&gt; it says 1.2V and 2A which probably explains why it didn&#39;t work and=
 is<br>
&gt; now not working.<br>
<br>
<br>
</span>voltage is irrelevant for this, the current is the one generating a<=
br>
magnetic field and moving the rotor; try adjusting that trimpot with the<br=
>
thing running<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
<br>
&gt; Does anyone know of a good source for a nema 23 stepper motor?=C2=A0 T=
he<br>
&gt; drv8825 is rated for 2A and my kayak trolling motor is not difficult<b=
r>
&gt; to turn so I don&#39;t believe it needs to be high holding torque.<br>
&gt;<br>
&gt; Any help will be GREATLY appreciated!<br>
&gt; =E2=80=8B<br>
&gt; Thanks,<br>
&gt; Rob<br>
<br>
<br>
</div></div></blockquote></div><br></div>

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