Telementery Ideas

[Scott Flanagan]

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Thanks alot, for your input.  I am probably going to stick with keeping =
the computer in the car, KISS.  Transmitting the data would just be one =
more thing to go wrong.  If you could send me that schematic, it would =
be greatly appreciated, I am going to be using National Semiconductor's =
LM2907, or the LM2917, I have yet to decide which is better.


				-Scott Flanagan

True telementry systems transmitt the data into the air.  If you are =
doing
this, go to www.linxtechnologies.com, as they have serial RF-based
transmitter/reciever pairs.  The new 900MHZ 1/2 mile transmitters =
(indoors,
more outdoors) can transmit data at 56kb or thereabouts, which is very
suitable for your application.  Plus, it has true serial with =
handshaking,
unlike their less expensive modules.  A matched pair is about $100 - =
$120
or so, and requires 6-9 volts and your choice of antenna, a whip, a =
coil,
or their official small glue on plastic thing.

>to use the ADC0831 with a 4051 Multiplexer so I can have 8 inputs.  =
Plus=20
>other regular TTL lines about 5 in and 7=20

Good choice.

>would like to know if a simple frequency to voltage converter would be=20
>acurate enough to measure RPM.  Also, the race car hs two 45DCOE6=20

There is an older chip, the LM9400 Freq-V and V-Freq.  While its a 10 =
year
old chip (at least), they were dirt cheap, and fairly stable in their
conversions if you utilizize tantilum capacitors with a high tolerance.
Cheap ceramics or electrolytics in the R/C circuit would allow it to =
drift
at higher frequencies/voltages.  The beauty of this chip is it can =
convert
F to V and vice versa on the same chip - just not at the same time.
Anyway, I can dig out a schematic if you tell me you can find them.  I'm
sure by now there are probably 10 good substitutes by now.

>Webers and I was wondering if I could use a O2 sensor,=20

There is absolutely nothing stopping you.  Typical OEM O2 sensors vary
between 0 and 1 V, depending on the mixture.  We've discussed the Lambda
(O2) sensor's output before, though off hand I don't recall what 14:1
(Stioch) is, however its probably in the DIYEFI archives somewhere, if =
no
one jumps aboard this thread and fills you in.

You can use your ADC80xx to read the 0-1V, or if it floats your boat, =
you
can amplify the signal to 0-5V, giving you the full 8-bits to play with
computer wise. Of course, the more "stuff" between your sensors and your
A/D circuit you'll find you can introduce inaccuracies.  Linear Op-Amps =
are
very linear, but not perfect.

>or maybe a wide range sensor when that project finishes to measure A/F =
ratio=20
>and then make the changes in the weber, I know the fuel curve has a =
flat
spot in it. =20

Changing your A/F ratio is a matter of adjusting the fuel flow into each
weber tower via a small but strong servo motor.  At this point, you are
approaching the complexity of fuel injection.  BTW, they do make weber
towers with throttle plates that have injector bosses forged/welded at =
the
base... and it looks very impressive if you are a big tuned Weber fan.

>Also could someone please explain the advantages of a Wide Range 02 =
meter=20
>as opposed to a lambda 02 sensor, thanks.   I will keep the group =
posted=20

The wide range sensor, my understanding is its output is greater than =
0-1V,
and can read a very lean mixture with some accuracy.  Most OEM sensors
generate 0-1V and are not entirely linear, but damn close.


Frederic Breitwieser
Bridgeport, CT 06606

Homebrew Automotive Website:
http://www.xephic.dynip.com/

1993 Supercharged Lincoln Continental
1989 HMMWV
2000 Buick-Powered Mid-Engined Sports Car

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