gnupic: ADC using an RC circuit instead of a ADC port??
Subject:
Re: ADC using an RC circuit instead of a ADC port??
From:
Brent Picasso ####@####.####
Date:
30 Aug 2002 22:41:08 -0000
Message-Id: <20020830224005.1333.qmail@web40608.mail.yahoo.com>
Thanks for the great replies..
When you say "low speed input" - what's low speed? do
you think I could take a measurement within 2ms?
I want to track a pressure sensor to track changes in
a automobile's manifold pressure.
I want to measure it at for at least every ignition on
the engine... at 10,000 RPM with a 4 cylinder engine
that happens every 4ms or so.
Any ideas on a 16F628 + ADC equivalent PIC I could
use?
Thanks,
Brent
--- Martin Peach ####@####.#### wrote:
> Brent Picasso wrote:
> >
> > Not sure if I saw it on this mailing list before,
> but
> > I'm trying to determine if it's feasable to do
> > analog-digital conversion using a RC delay using
> > standard IO pins, and a counting routine in the
> > software.
> >
> > I've searched google; didn't find anything good.
> >
> > I'd like to use a 16F628 for my project as I only
> need
> > one ADC line!
> >
> > thanks in advance for any help.
> > Brent
> There's an app note about that on the microchip web
> site, using a
> 12c50X:
>
>
http://www.microchip.com/download/appnote/devspec/16c5x/00513d.pdf
>
> It works fine for low speed inputs like temperature
> or potentiometer.
> /\/\Martin
>
>
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