DIY_WB Data logging?

[The Punisher]

You can get flash pic chips that run at 20MHZ for around $5.00-8.00US. Then 
an EPIC programmer from Micro Engineering Labs for about 50 bucks(I think I 
payed 59.00 3 years ago) and make youre own ICSP(in circuit serial 
programming) cable (made mine from scraps in about :30). 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.
The 16f877 is popular and inexpensive. It has 8k of code space, 368 bytes 
ram, and 256 bytes of eeprom on the chip. The only external components 
needed would be a 5 volt regulator, a crystal, 2 cap's(to help the crystal 
oscillate), and a couple resistors. It has multichannel AD converter built 
in(8 channels IIRC). You could VERY easly acomplish youre datalogging and 
display on an inexpensive LCD display (2x16,2x20 and 4x20 are common). for 
extra data storage you could get a serial eeprom (I2C bus is built in just 
for this).
If youre going to build just one unit and dont need high speed the stamp is 
a bit cheaper. but not MUCH easier. After the second or third stamp purchase 
then the compiled pic is more cost effective(and still way more powerfull).
At least thats been My experience with Embedded controllers.



>From: John & Meleaia McClure <jmcclure at sstelco.com>
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: DIY_WB Data logging?
>Date: Fri, 14 Dec 2001 19:13:30 -0600
>
>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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