What you need Ed is a two wire serial EEPROM.
Works like a tape recorder. You send it data and it stores
it sequentially. Perfect for data logging. When you read
it back it sends it back sequentially perfect for RS232
transfer to the PC. 8 pin mini dip.

One megabit should be plenty. BCD four bits per number.
256K numbers. Three numbers per data point.
85,333 data points. 20 three number parameters is a data set.
(Parameters =: temp, press, RPM, pulse width, etc., etc., etc..)

4266 complete 20 parameter data sets. At one data set sample per
10 seconds that is 426 samples.
Or 71 minutes or 1 hour 11 minutes of data.
If my arithmetic is correct.


http://www.atmel.com/atmel/products/prod6.htm

Paul Lamar

Thanks for the literature on the EEPROM.  Clearly, I have a lot more to
learn about the PIC field and such.  But, I would think 80K+ data points
should take care of most needs.  I'll check with Tracy and see where he
stands on bring a readout for his data to the  user.

Ed

Well he outputs injector pulse width for sure :-)
Then of course you have ignition timing pulse for RPM and
the temp sensor data in parallel. Tracy's manifold pressure
sensors are on the CPU card so that is probably not practical.
Oil pressure is also available. O2 sensor data. Water temp.
Oil temp. Did I miss anything else?

Oh there is the GPS NEMA 0183 RS232 data for alitude, speed, position 
and heading. Rate of climb is implicit so the cooling data
can be related. I can help you a lot with that.

BTW Ed I will do the PC download end in QB and send people a DOS boot
floppy so they can boot up DOS and run the QB stuff if it won't
run in a DOS Windoze :-) I don't want to do it in VB but somebody
else on here might take on that project. Especially after I get
it working in QB.

Paul Lamar
 
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