[Diy_efi] Data Logger CPU schematic and C for review

[Adam Wade]

--- "Steven P. Donegan" <steve at donegan.org> wrote:

> I am already doing RS-232 and LCD output logic in
> the data logger - we can re-use that stuff with
> the ARM...

I actually had a good idea formulate while reading
this.

Why not offer source code to make the data logger
optionally into a smart gauge "package"; you could use
the separate processor in the data logger to handle
measuring and displaying data from sensors etc., and
doing data logging at the same time, and leave the
processing power of the "main brain" for EFI-related
tasks.  Would it be reasonable to send data for gauge
functions through the I2C port?  I know some of them
today runj much faster than the original standard, so
it might be feasible to send a sensor "address" byte
and a sensor reading perhaps two of three times a
second.  Each sensor would have a data broadcast this
often.  Does that sound reasonable?  Or you could even
use the data logger as a "front end"; it inputs all
your sensor data and then sends it out over the I2C to
other interested parties, and you don't connect any
sensors at all directly to the MCU.  And then you
could have full display and control (perhaps useful
when debugging, and def. useful when tuning) on the
dash, while having the actual ECU under the bonnet.

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