This tablet is less than $50 from Walmart.

Have no interest in an EFIS on a tablet as there are many many
commercially successful solutions that are tested and affordable. No
need to re-reinvent the wheel.

Much interest in simplified EFI and ignition systems that work on
real engines. Current commercial solutions are expensive and
complicated.

C. Smith

If you would like to practice while I get the low cost EFI printed
circuit boards made down load the free qb64. I think it runs on
Windows 8. There is no hardware I/O like PWM or A to D in qb64 but
you can practice arrays which are the key to any EFI.

Windows, unlike the old DOS, does not allow  hardware I/O.

http://www.qb64.net/


When I get the EFI PC board done you will need a $29+ $9 shipping
Mini MO from this company. It is the brains of the EFI and allows the
EFI to communicate with your PC using a USB cable. There will be a
socket on my EFI PC boards that this plugs into. I have done biz with
this company in the past and they are reliable.

http://www.mikroe.com/mini/stm32-m0/

Once you have that you can download the free BASIC from them that
does do hardware I/O. No need for my PC board yet. You can turn LED's
on and off to simulate injectors and feed low voltages up to 3.3
volts into the A to D and see what affect that has.

A scrap MAF would be fun to play with as you can use a hair dryer to
  make it think it is seeing intake air flow. Don't forget to limit
the MAF out put voltage with a divider and 3.3 V zener. The Mini MO
can send the voltage out of the MAF to your computer screen. Good
testing device for MAF's.

You can also build a smart rotary engine compression tester with the
  Mini MO. All you need is a $5 pressure sensor from DigiKey or
Mouser.

Testing various other engine sensors (water temp, oil pressure,
manifold pressure, etc., etc., etc..) is a piece of cake. But you
probably have all that stuff already at work.

I should be getting my Mini MO any day now.


Paul Lamar


Got my Mini MO from MikroElec in Belgrade Serbia via DHL.
Worked right out of the box after I soldered on the mounting pins.
It is cheaper to ship without the pins soldered on.

What is wonderful about it is it uses the PC USB power supply.
No separate power supply needed.

It was real easy to set up. This simple compiled BASIC program came
with it to prove that it is working. I could send you a movie of the LED
blinking but it is 2.5 meg :) But I won't. The mini MO only has
about three.

This blink program is general purpose as it works with
all Mikro boards. Some have 9 par ports.

If the LED's blink it can turn on an injector.

These on board LED's can be used to trouble shoot or communicate the
status of your program. Two LED's give four  codes not counting
blinking in various combinations.

I had another idea to further simplify the program.

The PWM routine has pulse rate and pulse width
parameters. If you set the pulse rate to the RPM and
the pulse width to the manifold pressure you don't need
a look up table. In theory the fuel will be proportinal
to the air getting in the engine. No arrays needed.
You tune it by changing the ratios.

You still need a leaning knob on the instrument panel.

Not counting the cost of the injectors this kit is
going to come in under $200.

Paul Lamar