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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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--089e013a20f8186add051997e162 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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 > > > --089e013a20f8186add051997e162 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <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"><<a href=3D"mailto:= geda-user AT delorie DOT com" target=3D"_blank">geda-user AT delorie DOT com</a>></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> > Sorry to keep hammering this stepper driver issue on the geda board<br= > > but my collaboration options are very limited.<br> ><br> > This kayak steering via a nema 23 stepper is driving me BONKERS!=C2=A0= I<br> > had it working prior to last summer but then spent 4 months in the<br> > hospital critical, got out, worked on the shifting code, now the<br> > steering isn't working and I can't figure out for the life of = me what<br> > changed!<br> ><br> > To sum up: I am using the Pololu DRV8825 stepper driver that I set up<= br> > on a bread board with a microchip pic16f1937.=C2=A0 I have verified wi= th an<br> > usb logic analyzer that all the control signals to the drv8825 are<br> > correctly programmed and that the output A+, A-, B+ and B- signals are= <br> > what they are supposed to be without the stepper connected.<br> ><br> > I then connected a new stepper and it made a soft whining sound but<br= > > did not turn.=C2=A0 I am certain it is wired correctly.=C2=A0 Now the = stepper<br> > does not appear to work.<br> <br> <br> </span>those drivers have adjustable output current ( there'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's<br> set to a low current (because it's safer - won'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> > I am sure I ordered a 12V 2.0 A stepper but looking at the motor tag<b= r> > it says 1.2V and 2A which probably explains why it didn't work and= is<br> > 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> > Does anyone know of a good source for a nema 23 stepper motor?=C2=A0 T= he<br> > drv8825 is rated for 2A and my kayak trolling motor is not difficult<b= r> > to turn so I don't believe it needs to be high holding torque.<br> ><br> > Any help will be GREATLY appreciated!<br> > =E2=80=8B<br> > Thanks,<br> > Rob<br> <br> <br> </div></div></blockquote></div><br></div> --089e013a20f8186add051997e162--
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