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=ot3DLIV6ikRtbRjf45hjQN1mm2q9YTEAeX9UZ/LuSVg=; b=Ghs1qIrRjGljUhzmntBRii5Eiute0JkdZ8o42oEqWsR6wvRs87+gf4OCmtaS4cmKSm jSXaD6uYtVgcva1U80SM//QK25Fl1WehPgNODa2RdAeLR6vYTE+/8S1TSJ57bCRRg6hX cz6bi/EgZL3ouf32D1u6fED+cN7iv3qRZmYVKx8IOEexb9S1IoCpot4smQQLa3jdgxS6 ha9GoaRd0fSvfbKkBVzyUBGtbmOAD1iztr8yQjpQ2Yak6WGgFl3u0fHVU+OJpFU06dA7 J93JgJTxgePm3kvoxi1q8tkrzN3CaThXGh7hJfee+g/hutk7mbPNp6G05MLXEYqNYKV3 g8rw== MIME-Version: 1.0 X-Received: by 10.52.243.7 with SMTP id wu7mr12557944vdc.88.1431463029046; Tue, 12 May 2015 13:37:09 -0700 (PDT) In-Reply-To: <20150423214501.GD47936@cicely7.cicely.de> References: <5536A38F DOT 50104 AT m0n5t3r DOT info> <20150422013637 DOT GF29418 AT cicely7 DOT cicely DOT de> <20150422161012 DOT GA42355 AT cicely7 DOT cicely DOT de> <55395CD0 DOT 70107 AT m0n5t3r DOT info> <20150423214501 DOT GD47936 AT cicely7 DOT cicely DOT de> Date: Tue, 12 May 2015 16:37:08 -0400 Message-ID: Subject: Re: [geda-user] Stepper driver issues From: "Rob Butts (r DOT butts2 AT gmail DOT com)" To: geda-user AT delorie DOT com Content-Type: multipart/alternative; boundary=001a1133c16e5b05bb0515e87588 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 --001a1133c16e5b05bb0515e87588 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Bernd and anyone else who can offer advice about the DRV8825 stepper driver, Have you used the DVR8825 in an application? I spun a new test board with the bare minimum circuitry to support both a pic16f1937 microchip processor and the DRV8825. I set up the micro io to control the stepper driver to drive a nema 23. With the DRV8825 not plugged in I'm able to toggle the 8 control lines to the DRV8825. When I plug in the DRV8825 the Step and Dir lines are held low. I've used two different DRV8825s from two different suppliers with the same outcome. The schematic of the DRV8825 shows the two lines as inputs. The TI DRV8825 datasheet shows both as inputs with internal pulldown resistors. Aside from what I've said is there something I'm missing? Have you found the DRV8825s to be faulty? Some of the comments on the internet elude to faulty. =E2=80=8B --001a1133c16e5b05bb0515e87588 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Bernd and anyone else who can offer advice about= =C2=A0the DRV8825=C2=A0stepper driver,

Have you us= ed the DVR8825 in an application?

I spun a new tes= t board with the bare minimum circuitry to support both=C2=A0a pic16f1937 m= icrochip processor and the DRV8825.=C2=A0 I set up the micro io to control = the stepper driver to drive a nema 23.=C2=A0 With the DRV8825=C2=A0not plug= ged in I'm able to toggle the 8 control lines to the DRV8825.=C2=A0 Whe= n I plug in the DRV8825 the Step and Dir lines are held low.=C2=A0 I've= used two different DRV8825s from two different suppliers=C2=A0with the sam= e outcome.

The schematic of the DRV8825 shows the = two lines as inputs.=C2=A0 The TI DRV8825 datasheet shows both as inputs wi= th internal pulldown resistors.

Aside from what I&= #39;ve said is there something I'm missing?=C2=A0 Have you found the DR= V8825s to be faulty?=C2=A0 Some of the comments on the internet elude to fa= ulty.
=E2=80=8B
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