DIY_WB Data logging?

[rr]

The most effective method of data logging entails tying the DIY-WB
value in with the rest of the ECM variables. Most ECMs have an
extra ADC input that can be used. Hang the DIY-WB off that and add
the code to do a convert on it. Then output the DIY-WB ADC counts
to the ALDL stream.

If using a C3 ECM another possibility is using the Lockers setup.

BobR.


John & Meleaia McClure wrote:

> Thanks for the heads up on the leftover DIY_WB PCB boards and kits....I'm
> waiting anxiously for my chance to get one.
>
> (Warning: I'm about to start talking about things I know very little about.)
>
> It looks like the group has the DIY_WB board working since several fellow
> have successfully tried it out now....and there are at least a couple of
> people working on output displays.  One LED bar graph and another LCD
> numeric display.  I was wondering if anyone has thought of some kind of data
> logging circuit for the WB 02?
>
> I know Fluke makes some nice DMM's that have logging capabilities, but they
> aren't exactly cheap.  And cheap is what I like.  I do have some familiarity
> with some SBC's which would have no problem logging the DIY_WB's voltage
> signal thru a A/D input board...I'm thinking of PC104...or similar, but this
> is kind of overkill just to record one voltage signal vs. time.  I'm looking
> at this from the perspective of a drag racer, so the longest sample time I
> would really need will be 30-60 seconds max, with a sample rate of 0.5 - 1.0
> Hz.  Therefore we're only talking about 60-120 samples to collect.  The
> playback part will be tricky I suspect.
>
> My technical background is in Mechanical Engineering so most electronics go
> under the "magic smoke" category.  Would an embedded PC chip such as the
> Basic STAMP or PIC chips be able to do something like this for a minimum of
> $$$$$?  If so, is there some info on the web that would give me a quick
> tutorial on how to accomplish this?
> It is fairly easy to get a curve fit equation for the 02 volts vs. A/F ratio
> curve
>
> Currently I'm using an old IBM 730TE tablet pc running a package called
> TurboLink to collect ALDL data during a run.  The developer has an optional
> boost sensing harness that uses the IAT connector to hook up a 3 bar map to
> get a boost signal into the ALDL stream.  It ~MAY~ be possible to sacrifice
> another sensor (I'm thinking that the coolant temp sensor could be given a
> "dummy" value of 165degF) to bring the DIY_WB signal into the ALDL.  But
> this may not even be practical.  It would be nice to have all the info in
> TurboLink though.
>
> On a side note....Within the Buick Grand National community there is a
> fellow who makes some pretty nice instrument/gauge enclosures for the GN's.
> His work is top notch and most of the parts are engraved with graphics and
> text.  He does custom work, so he may be able to fabricate a nice enclosure
> for the DIY_WB if we can come up with a drawing of what we want.   Just an
> idea...personally I'd rather have a nice looking case sitting on the dash of
> my car than a breadboard rat's nest of wires (I'm speaking of my own
> handywork and not anyone's on the list).
>
> Sorry for so long.
>
> Thanks,
> John

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