I'm thinking worst case scenario is leave the engine control functions
to the Atmel, and have a separate independant system for data acq and
logging.
C. Smith

I think that might be a good idea. I think a sensor,
such as a manifold pressure sensor, can feed
voltage data to at least two different high input
impedance  analog to digital devices.

Paul Lamar

The more I think about it the better I like it.
What it does is greatly  simplify the software.

Use three boards. One for com to the net book
and two for EFI.

There are cheaper boards but once you pay for
the USB interface they are no cheaper.

Great I idea Craig. I am going to go for it.
I'll quite wasting time trying to cram com in one board.
It is an option that can be left off.

Paul Lamar


There are so many new avionics gizzies out there, purpose built engine
monitors with built in logging functions, many EFIS have provisions for
various sensor inputs and logging capability. In my eyes, the separate
and
independent monitor  is a better system because there could be no code
carry
over errors to smear data.

I think you are on the right track to focus on just getting a standalone
engine control system up and running. FI and Ignition. That alone will
get
so many rotaries up and flying, that all the bells and whistles will
come on
the heels of your success. Simple and rugged construction. That's what we
need.
C. Smith



You can always do a fan out of inputs by using a lm 324 op amp as a
voltage follower. One input = 4 outputs.

chris smale

I don't think that will be necessary. These processors have CMOS
level inputs.

Paul Lamar