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Date: Wed, 21 Dec 2011 16:21:31 -0500
Message-ID: <CALSZ9gogcHoVvy47XGVn7Z4NwxYT4zM1d-M_WiNf2psXDbCcvw@mail.gmail.com>
Subject: Re: [geda-user] Design suggestions...
From: Rob Butts <r DOT butts2 AT gmail DOT com>
To: geda-user AT delorie DOT com
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Opps, control

On Wed, Dec 21, 2011 at 4:20 PM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:

> 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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Opps, control<br><br><div class=3D"gmail_quote">On Wed, Dec 21, 2011 at 4:2=
0 PM, Rob Butts <span dir=3D"ltr">&lt;<a href=3D"mailto:r DOT butts2 AT gmail DOT com"=
>r DOT butts2 AT gmail DOT com</a>&gt;</span> wrote:<br><blockquote style=3D"margin:0p=
x 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>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><div></div><div class=3D"h5"><div class=3D"gmail_quote">On W=
ed, Dec 21, 2011 at 3:24 PM, John Griessen <span dir=3D"ltr">&lt;<a href=3D=
"mailto:john AT ecosensory DOT com" target=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>
</div></div></blockquote></div><br>

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