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Date:	Wed, 21 Dec 2011 16:20:17 -0500
Message-ID:	<CALSZ9grRNvUt+FZ2UoFveko7twUasS2++uZcBQuWqW6JkbfjfQ@mail.gmail.com>
Subject:	Re: [geda-user] Design suggestions...
From:	Rob Butts <r DOT butts2 AT gmail DOT com>
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Thanks everybody, it's going to take a bit to absorb this since pwm control
is new to me.

My original thought was to monitor two pots on two adc inputs to the
micro.  Depending on the voltage at each pot I would set the pwm duty cycle
corresponding to the pot voltage.  Set up for one channel I was going to
use TIs h-bridge (Digikey p/n 296-25377-1-ND) to controle each motor.  From
how I understand it DJ's "pulse dithering modulation" would work with this.

On Wed, Dec 21, 2011 at 3:24 PM, John Griessen <john AT ecosensory DOT com> wrote:

> On 12/21/2011 02:15 PM, DJ Delorie wrote:
>
>> I'd take out the 5K resistors.  You want to turn the
>> bridge FETs on hard and fast.
>>
>
> Sure.  I changed the sketch.  Experimenting to "not get hot"
> FETs should do.
>

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<div>Thanks everybody, it&#39;s going to take a bit to absorb this since pw=
m control is new to me.</div><div>=A0</div><div>My original thought was to =
monitor two pots on two adc inputs to the micro.=A0 Depending on the voltag=
e at=A0each pot I would set the pwm duty cycle corresponding to the pot vol=
tage.=A0 Set up for one channel I was going to use TIs h-bridge (Digikey p/=
n 296-25377-1-ND) to controle each motor.=A0 From how I understand it DJ&#3=
9;s  &quot;pulse dithering modulation&quot; would work with this.<br>
<br></div><div class=3D"gmail_quote">On Wed, Dec 21, 2011 at 3:24 PM, John =
Griessen <span dir=3D"ltr">&lt;<a href=3D"mailto:john AT ecosensory DOT com" targe=
t=3D"_blank">john AT ecosensory DOT com</a>&gt;</span> wrote:<br>
<blockquote style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-=
color:rgb(204,204,204);border-left-width:1px;border-left-style:solid" class=
=3D"gmail_quote"><div>On 12/21/2011 02:15 PM, DJ Delorie wrote:<br>

<blockquote style=3D"margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-=
color:rgb(204,204,204);border-left-width:1px;border-left-style:solid" class=
=3D"gmail_quote">
I&#39;d take out the 5K resistors. =A0You want to turn the<br>
bridge FETs on hard and fast.<br>
</blockquote>
<br></div>
Sure. =A0I changed the sketch. =A0Experimenting to &quot;not get hot&quot;<=
br>
FETs should do.<br>
</blockquote></div><br>

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