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 outputs and
the driver 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

Something to note- for the fuel pressure and oil pressure sensors
(and maybe others depending on the particular sensor) they need a 5v
excitation source. The EIS has this internally sent to the OP, not
the FP. The solution is easy- a 7805 regulator chip with a resistor.
The info (other than the 7805 part) is in the EIS installation
information.

no V will result in no reading.

Kevin Alderman A&P, GROL, ASEL Comm/Inst



Maximite has 3.3V (50mA) and 5V (500mA) onboard. This thing has everything.

- Matt Boiteau

- Matt





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