X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        bh=usZ22EMCbduOrKskztScZ1PYMhsqcl21L8oxKfUDcKo=;
        b=By8kfxrAcjuTIVKnCRJtQAzleNaZW5ZCnqivXFj9YhrraqhePwCblJJsfQFta01GYA
         6l2d3KhLjOduyDowmvlYquu3b4YHEFItrzMHMNc31+aG/fAnH9Ca/fEAtb/SxVTToDSg
         2DQv0Uf77KqMrxYiyQAAbwGdlX8zziS68wn5IbSUl6TQmgxScAxsrMiIW1XC+bYdKX8w
         BWhQVw5We4S4LIPI4L8qiQ5Q912wzgRTfnfXehHSYKwV9ao+f5HkRfVkXdsYtT4ZBreG
         aznYSGQXDOstfVPJd/C5AI5r3o1fb0uRxPjAx+1qVjhvrsvKXZ14rLMO42Luys6ZyHVw
         pYYA==
MIME-Version: 1.0
X-Received: by 10.52.3.42 with SMTP id 10mr9915876vdz.10.1435521609632; Sun,
 28 Jun 2015 13:00:09 -0700 (PDT)
In-Reply-To: <20150628180958.GD94280@cicely7.cicely.de>
References: <CALSZ9gq73RBxHV5LPe7pQWNO3kK7EPXaRiN0U7zFBV9BsQX78w AT mail DOT gmail DOT com>
	<55395CD0 DOT 70107 AT m0n5t3r DOT info>
	<20150423214501 DOT GD47936 AT cicely7 DOT cicely DOT de>
	<CALSZ9gqAPj6h2Z_gLvHTBdL-cnQ6p_juTonjE0e+oDAaRy7KTQ AT mail DOT gmail DOT com>
	<55530929 DOT 2070301 AT gmail DOT com>
	<CALSZ9grqsRc+U5p=LeQpzBU6_c6tWg-VrDYEqav99K_1L1P=2Q AT mail DOT gmail DOT com>
	<5555971C DOT 8000902 AT gmail DOT com>
	<CALSZ9gqtmaetZs7rHrx_sTrc1vqKkMMvDhPf0P9vs4EmuC9Q3w AT mail DOT gmail DOT com>
	<20150628171205 DOT GB94280 AT cicely7 DOT cicely DOT de>
	<CALSZ9gqeKWLzwihV4SgXtm17Jg1EGUn70NxhT+n7FgnfzMjY0g AT mail DOT gmail DOT com>
	<20150628180958 DOT GD94280 AT cicely7 DOT cicely DOT de>
Date: Sun, 28 Jun 2015 12:00:09 -0800
Message-ID: <CAC4O8c88ehzPCEJ=W0g1gXAOzn8PMuhBsAxK2o0JNpmYNV54vg@mail.gmail.com>
Subject: Re: [geda-user] Stepper driver issues
From: "Britton Kerin (britton DOT kerin AT gmail DOT com)" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Content-Type: text/plain; charset=UTF-8
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

On Sun, Jun 28, 2015 at 10:09 AM, Bernd Walter <ticso AT cicely7 DOT cicely DOT de> wrote:
> On Sun, Jun 28, 2015 at 01:33:45PM -0400, Rob Butts (r DOT butts2 AT gmail DOT com) wrote:
>> I will check the driver voltage supply since in this bread board setup it
>> is the most suspect.???
>
> Bread board is very likely an issue.
> The output drivers switch high current low-side and high-side.
> If ground supply of the driver module shifts relative to your microcontroller
> then it can easily detect wrong signals.
> It can also have problems on the power output, because of undervoltage
> spikes triggering temporary driver shutdown, etc..

Consider each bread board tie point to have resistance up to 0.5 ohm or
perhaps even more, and not much power dissipation.  If you're putting any
current through it it won't work consistently on a breadboard.

I've gotten tempted to try and gotten voltage sags, slight melting of
breadboard etc.

Britton