I just ordered a maximite kit. I'm going to see if I can make this work
instead of buying the GRT EIS. By adding the maximite rs232 serial port
chip, I should be able to send the same commands to display on the GRT HXr
glass EFIS display. At the same time, the HXr has video in, so I'll be able
to see my own display, and see the HXr display onscreen.

Fuel flow will be the only real calculation based on the injectors
opening/closing (cycle rate), the rest is simply reading the gauges and
sending the value out to the screen/serial port. Should be pretty straight
forward.

Stay tuned.....

Paul, I'm not sure if you are focusing on EIS or the ignition controller
with this chip, but I'm going to start with the EIS. I'm sure we will talk
off-line and share our ideas and code. Open Source always wins !

- Matt  Boiteau



Great Matt. Don't be afraid of asking any question no matter how dumb
it might seem :)

All three  can be done at the same time with the Maximite. Ignition trigger, EFI and EFIS.
For EFIS all you do is say "PRINT' and the data magically appears on the EFIS screen :)
Send a 15 usec wide 12 volt pulse to the Lamar Inst. cd system and you get a spark.
Best to use MC4424 for this as it requires a bit of current to keep down
RF noise pulse from false triggering. Each MC4424 will fire two CD systems.

BTW these are the greatest  MOSFET drivers  I have found so far for the
injector MOSFETs. Each one will drive two MOSFETS. Very easy and simple
to use.  Put a series 1K resister between the chip and the input pins.


Just about any TO-202 MOSFET will work for the injectors.

The IRFB8721 are about a buck and  a quarter each from DigiKey.

Paul Lamar

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