gnupic: ADC using an RC circuit instead of a ADC port??
Subject:
Re: ADC using an RC circuit instead of a ADC port??
From:
Martin Peach ####@####.####
Date:
3 Sep 2002 14:39:31 -0000
Message-Id: <3D74C975.ADFB3DD7@vax2.concordia.ca>
Brent Picasso wrote:
> 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?
You could wait (how long?) for the 16F88: it will (possibly...) have 7
channels of 10-bit A/D at hundreds of kHz sampling rate and is
compatible with 16F628. OTOH the 18F8XX2 28 or 40-pin chips might be
easier to obtain right now.
The PIC ADC seems to be an internal implementation of the
sample-and-discharge-through-resistor method.
/\/\/\/*=Martin
