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Sun, 28 Jun 2015 10:41:54 -0700 (PDT) | |
Subject: | Re: [geda-user] Stepper driver issues |
To: | geda-user AT delorie DOT com |
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From: | "Sabin Iacob (iacobs AT m0n5t3r DOT info)" <geda-user AT delorie DOT com> |
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Date: | Sun, 28 Jun 2015 20:41:51 +0300 |
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --7NbulXjm5ilCnXX0o6RpjW5uVBfDlRNdd Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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 --7NbulXjm5ilCnXX0o6RpjW5uVBfDlRNdd Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJVkDHfAAoJEIIekQf3ltoLA8EP/R8HS7SkP5O2zf7yEFEOwfl9 z+qLmwqXkvPJZe6l/Swp+XtjTXShCCt4HFNDSp40Ov+4lIN7QaaKU1OzqkZS7IM+ LNEwRmdqfZO06qWupKugHyDx22PC/JOFFwbwtEH6ZoMcb5VX9cqZddBGmXyS44Xx ShuEgxMmRMHtM1u5vL7Qt65pTzFSgi1AvxrO3XkypCYeQ3uM4omG+8WUYsS1AGsX Eu5HU32+jk1eOvQdZT0vmG+/cHAhOJ5RRWzgp0Ju5nNuxOegf/HYEQiA8DbOuHjo 3RA1cZqIC9uaBe8NT+cBiFUm2St1mhqrNm2Ybq+no2yeND/Grr695raMPl0g+IAs ssaKYYLPOdDQE0Lt8d7uLg9HInNQ02HnlAw2VQdGri/EmeTy/JrUO0ScE/WImR6f CaXc4QQ6zKBxEWUg9ZUdsT+PQGdcfGgKpibJH4oZ7eiQPTLC3rlWL9dnTIMV4B7B eQUiuO07n8n6IB3OPt8yEi7y0DKuZ3EvMsRrH2sx1OG/oHil9xn2kANwpNzzQj8I rT8BRN32d2HEM766OOJ13d3ANLSh6j9NFA+qs+mEf2KPQ6MhJkvLd1N8w4aiEe3V FfdC2XMGMta59DsLPdffb7TRDGEEyr9B8WqKOO9e/E1SRRhsgZ7vtX/sjtVmMaiv TaCeVCzD8CVyZmPNqVek =Xnb0 -----END PGP SIGNATURE----- --7NbulXjm5ilCnXX0o6RpjW5uVBfDlRNdd--
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