DIY_WB Data logging?

[Phil Hunter]

"The Punisher" wrote:
[snip]
> Write youre code in  assembly for free, or get Micro
> Engineering Labs "Pic Basic Compiler" for 99 bucks
> (250 for the full tilt pro edition) and do it the
> easy way in basic (this compiler optimizes very
> well, you wont loose much speed over hand assembly).
> A compiled program like this will run tens to
> hundred times  faster than interpeted code like on
> a stamp.

I've read about an open-source Basic compiler for
Atmel uC's, http://www.rvkbob.com, Digi-Key is a
source for Atmel chips.

[snip]
> You could VERY easly acomplish youre datalogging and
> display on an inexpensive LCD display (2x16,2x20 and
> 4x20 are common).

I've mentioned this before, I think it'd be really
useful to have the PIC drive a D/A converter to
simulate a NB sensor into the ECM, then ALDL scan
tools, "lockers", Direct Scan and the like can do the
datalogging. With a known relationship between the
WB output and the NB ECM input, you eliminate the
guesswork of "780mV equals what A/F ratio?" when
using a NB sensor beyond it's intended range. Should
be useful to just about any EFI vehicle w/ a NB O2
sensor and a scan tool, plus no permanent mods are
required, so you could swap it around w/ buddies
at Test-n-Tune, for example. I've just started on
schematics, anyone further along?

[snip]
> If youre going to build just one unit and dont need
> high speed the stamp is a bit cheaper. but not MUCH
> easier.

For our purposes, besides speed a feature that's
missing in a lot of the Basic Stamps is A/D input so
you have to do it externally, but there's at least
one variation that has A/D built in, known as the Atom
from http://www.basicmicro.com. The Atom40 looks
promising too but specs & docs are sparse at the
moment. Anyone care to try to make a 30 LED WB
bargraph w/ the Atom40, just to "push the envelope"
in another direction?

[snip]

regards,
phil
(digest)



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