Will control up to four high speed CD systems on plug. It will spark
 up to 6 times 5 degrees apart at 10,000 RPM.

Two VR sensors and four optical or Hall Effect triggers are
accommodated.

It will work with existing car computers or stand alone engines with
 out EFI computers. It will work with carburettors.

It can be programmed with a wide variety of sparking scenarios. Not
just every 5 degrees. The amount of energy in the spark is also
programmable.

Paul Lamar


Is this project complete, or still prototyping? C. Smith

It is complete.

Paul Lamar


Paul, does this system also control the fuel injection? If not, are
you considering adding that function because I really want to go
fuel injection for better fuel economy and to eliminate carburetor
icing. Since I live at 8,600 feet elevation I will be turbocharging
and want a system that will allow leaning for my high altitude
cruising.


Thanks. Ron Reynolds - Wyoming

No this one is not designed for fuel injection. The off the shelf
Maximite is the one to use for fuel Injection and EFIS. I hope to
have a Maximite bench demo working for my forums at Sun N Fun in
April. If you do that this control computer is not necessary. The
Maximite can trigger the ignition CD systems instead.

Here is a very simple BASIC EFI/EFIS program that will run on the
Maximite. The Maxmite uses a PC VGA display mounted on the
instrument panel and a PC keyboard. Ignition is not implemented yet.
The 18 meg docs on the Maximite are free for download.

There will be a separate small PC board needed with injector drivers,
manifold pressure and trigger sensor circuits very similar to Tracy's
system.

Lines starting with a ' are docs only. Not part of the program.

'SETPIN pin, cfg [,target] 'Will configure the external I/O pin
according to cfg : 'The original Maximite has 20 I/O pins numbered 1
to 20, the Color Maximite adds 'another 20 I/O pins on the Arduino
connector. These are labeled D0 to D13 and A0 'to A5. '0 Not
configured or inactive '1 Analog input (pins 1 to 10, A0 to A5) '2
Digital input (all pins and 5V tolerant on pins 11 to 20) '3
Frequency input '4 Period input '(pins 11 to 14) '(pins 11 to 14) '5
Counting input '(pins 11 to 14) '6 Interrupt on low to high input
change (pins 1 to 20, D0 to D8) for target '7 Interrupt on high to
low input change (pins 1 to 20, D0 to D8) for target '8 Digital
output '(all pins) '9 Open collector digital output to 5V (pins 11
to 20, D0 to D13) In this mode the 'function PIN() will also return
the output value. 'The starting line number of the interrupt routine
is specified in the third 'parameter ' target . This mode also
configures the pin As a digital input so the value of the 'pin 'can
always be retrieved using the function PIN(). 'See also IRETURN to
return from the interrupt. 'See also: 'IRETURN PORT P

"The program starts here.

Mode 1 'Mode # changes the size of the characters on the display.

For n = 11 To 20 SetPin n, 9 'set pins 11 to 20 as open col 5 v
output Next n

Open "data.txt" For output As #1 'data file

SetPin 8, 6, 10 'pin 8 low to high int gosub line 10 SetPin 10, 1
'manifold press on pin 10 SetTick 1000,20

BakGnd: 'loops over and over again manpre = Pin(10) 'A to D on pin
10. may need to be scaled manpre2 = manpre * 10 manpre3 = Int(manpre)
PWM 20,manpre3,manpre3

'pulse width on primary injectors 'and secondary 20 times a second
'as a function of manifold pressure

GoTo BakGnd


10 RPM: RPM = RPM + 1 IReturn

20 RPMRoutine: RPM=RPM*30 Cls Locate 30,30 Print "RPM = ";RPM RPM = 0
Locate 30,60 'col 30 line 40 Print "Manifold pressure = ";manpre
'EFIS function IReturn

'There is no copyright on this code. It is open source. Everything
learned will 'be shared.

Paul Lamar



Thank you Paul for helping us to find cost effective ways to get into the air.
I feel comfortable with fiberglass lay up and welding aluminum parts and
motor mounts and even rebuilding a rotary engine but programming a
computer with something so important as to keep my engine running in
all the various conditions really scares me.  Perhaps by the time I am ready
to install my Mazda someone smarter than me will have perfected this
process and I can just buy and plug in.

Thanks again.
Ron Reynolds

Don't let this stuff scare you. The Maximite computer has room for literally  hundreads
of BASIC programs stored on the 64 gig SD card. It only takes a few seconds to load
anther one and run it if the one your using does not work for some reason. It is a complete
operating system just like the Apple II, the TRS80 or DOS. That is the revolutionary part
about the Maximite. It is a major break through in micro-controllers.

You can load and save somebodies else's program that has been tested by several other people.
No need to learn to program no matter how easy. BASIC is VERY easy.

Later on when you have some ideas you can try them and it if does not work load
and run the old standby program. You can take the SD card out of the Maximite,
plug it into your windows computer and download a program you get by email.

Also different programs can be stored for various failure scenarios. Lets say the mass
airflow sensor failed. Another program that uses just the manifold pressure sensor can then
be loaded and run. The engine will run fine on just manifold pressure data.

For a real world situation that happened to me. The float on a C172 carburettor  sank on me.
I kept the engine running with just the mixture control and successfully landed of course
as I am still here :)

Tracy gave us two identical programs. The only thing we could change
was the mixture table. Bugs occurred in the aircraft wiring and sometimes in the software. It was
very difficult to trouble shoot as we had no control over the program.  With the Maximite you
can write simple test hardware and sensor programs.  Or down load them from this newsletter.

Paul Lamar

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