[Diy_efi] Re: data acquisition from engine with PC soundcard

[Mike Diehl]

On Thursday 03 October 2002 08:01 am, you wrote:
     > Hi Mike,
     >
     > > On Wednesday 02 October 2002 12:52 pm, you wrote:
     > >      > Unfortuately no. My laptop's battery's turned out to be
     > >      > quite bad by now (I always used it from outlet, it can only
     > >      > run for about 70 seconds without) and
     > >      > I had to postpone the experiment because of lotsof else to
     > >      > do. (mstly I am working on the utilization of a patent)
     > >
     > > Actually, I was thinking about building an old 486 motherboard and
     > > building a 5 and 12 volt powersupply that would run off the car
     > > battery.  This hardware is much cheeper than a laptop.  Would be a
     > > shame to toast a laptop doing this.

The powersupply is the challenge for me.  I'm not an analog guy. <grin>

     > I thought of getting a Palm or Casio 320x240 PDA for $100-200,
     > one that can be programmed in C.
     > Build some analog/digital IO module (maybe the efi board
     > with a simple acquisiton software?),

My concern here would be bandwidth.  Most palm devices have serial inputs.  
I'd want to log SEVERAL channels.  That's why I was suggesting using an old 
PC motherboard.  You could talk directly to the bus.

     > which later can be used for other purpose. Even controlling
     > the car during tests. When all's well, I'd put the
     > tested-tuned program to
     > the efi board, and the PDA would just do the display without
     > any critical functions.

Using a PDA as a display is novel.  There are nice LCD/Plasma displays which 
are controlable via serial links and such.  Might be an easier develoment 
cycle.

     > What do you think of this?
     > We can get this back to the list (answer there if you like)

I'm very excited about this.  Soon, I'll have a running car.... with 4 EGT's 
and 4 WB o2's.  Like I said, SEVERAL channels!

-- 
Mike Diehl
'87 MR-2, 7A-Ge, Hand-bent headers (should be running this summer)
'96 4-Runner, Bone Stock
'90 Corolla, disguised as a Geo Prism.

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