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        Sun, 28 Jun 2015 10:41:54 -0700 (PDT)
Subject: Re: [geda-user] Stepper driver issues
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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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