test bench was Re: Old 486 Board for ECU? Why?

Frederic Breitwieser frederic at xephic.dynip.com
Fri May 5 17:16:05 GMT 2000


Sound cards have a DAC, two in fact, one for each channel.  You can
multiplex these using a CD4066 chip and a simple circuit to select which
one.  The 4066 is a CMOS controlled analog switch.  I've used them in audio
circuits, specifically homemade guitar effects as a way of bypassing the
effect, or not.  Would work here too.

But, I never tried to use the SB DAC to convert signals from an analog
voltage source such as a sensor.  I believe teh DAC is good from 0-1V, which
might be fine for an O2 sensor (theoretically), but for a MAF 0-5V, the
range must be scaled down through an op-amp, which might decrease accuracy.

Try it and see ;)

-----Original Message-----
From: Swayze
To: diy_efi at diy-efi.org
Sent: 5/5/00 11:43 AM
Subject: Re: test bench  was Re: Old 486 Board for ECU? Why?

A 16bit soundblaster I believe is a DAC board but I wouldn't begin to
know
how to get 8 channels out of it. any suggestions.maybe some midi
circuitry?

byE
Mike
Swayze
mswayze at truswood.com
kswayze at bellsouth.net
----- Original Message -----
From: "Frederic Breitwieser" <frederic at xephic.dynip.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, May 05, 2000 10:14 AM
Subject: RE: test bench was Re: Old 486 Board for ECU? Why?


> There are more benefits than what is obvious.  For something like an
ECM,
in
> a car, full time, its gross overkill.  A motorola or hitachi or zilog
> process, as the OEMs use, is cheaper, easier to manufacture, smaller,
and
> certainly as plug and play.  Change code, change wiring harness, start
car.
> This is what the OEMs do, as we all know.
>
> The main advantage for me, is I have boxes of these things.  I also
> understand the architecture fairly well.  I'm in the
> PC/LAN/Infrastructure/Server industry.  My learning curve is much
smaller
> than if I attemted to solder together the EFI332 project.
>
> And that's cool :)
>
> -----Original Message-----
> From: Swayze
> To: diy_efi at diy-efi.org
> Sent: 5/5/00 9:40 AM
> Subject: test bench  was Re: Old 486 Board for ECU? Why?
>
> have been following this thread and don't really see the benefit in an
> x86
> based ECU, I do however see the benefit in using it for something like
a
> test bench, where inputs to an ECU could be simulated. are there any
> inexpensive 8-channel DAC boards out there that would make this easy
> (don't
> figure for this that ADC would be needed).
>
> byE
> Mike
> Swayze
> mswayze at truswood.com
> kswayze at bellsouth.net
>
>
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