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Tue, 12 May 2015 23:47:26 -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: | Wed, 13 May 2015 09:47:22 +0300 |
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Reply-To: | geda-user AT delorie DOT com |
On 05/12/2015 11:37 PM, Rob Butts (r DOT butts2 AT gmail DOT com) wrote: > Hi Bernd and anyone else who can offer advice about the > DRV8825 stepper driver, > > Have you used the DVR8825 in an application? I made a little board for it and used it for a proof of concept; worked fine, then the project (motorized telescope mount) ended up on the backburner due to a combination of lack of time and shinier things showing up > > 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. (assuming the enable and reset and sleep lines have the correct logic levels - reset and sleep must be high, enable low - I know I got that wrong by connecting enable and sleep together on my first try) held low as in "micro says high, line stays low"? is it a breakout board of some sort? try to measure the resistance between the pins and ground with the thing off, maybe you got the pinout wrong (according to the datasheet the internal pulldown resistors should be 100k) if it's not a breakout board: circuit mistake? bad soldering? I would guess the likelihood of two faulty chips from separate suppliers is rather low > > 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. > ​
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