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Date: Wed, 22 Apr 2015 18:10:12 +0200
From: Bernd Walter <ticso AT cicely7 DOT cicely DOT de>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Stepper driver issues
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On Wed, Apr 22, 2015 at 08:12:06AM -0400, Rob Butts wrote:
> Thanks Bernd for the Pololu tip ~ I didn't know there were drop in circuits
> like that.  I would have gone with one of these from the start and probably
> saved myself much grief.
> 
> What really bothers me is that this driving chip that I was using worked at
> one point and now I don't know what changed from when it did work.  I did
> not change that driving circuit.

It is easy to kill those drivers when you hotplug the motor or with
unrelyable connections).
This is true for prebuild drivers as well.

> The one thing I hope to do today is put 12V to each coil and see if it will
> step through at all.

Don't directly connect 12V to your motor.
You need to limit the current, because at 4 ohm you would get 3A, which
I assume is to high for your motor.
The high voltage is only to charge the motor coils more quickly, which
is important to get a high torque at higher speeds.

-- 
B.Walter <bernd AT bwct DOT de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.