I have ordered this ARM board to build a EFI system around, written in ARM compiled
BASIC.

It should be here in a few days DHL.

We shall see how it goes.

I should have something running in about a week.

Paul Lamar

I am reading through the documentation of this powerful ARM chip and I am struck by
the complexity of how it generates a pulse width. It involves setting up a timer to
interrupt the CPU to generate a pulse of the desired width to drive an injector.
The ARM has this in common with all the other high end chips.

So I said "self I think we can do it easier with a CMOS 555" So I put together this
schematic. It uses a low end CPU with at least 3 parallel ports and a $1 quad Digital
to Analog chip to drive four  $1 CMOS 555s that drive the FETs that switches the
injectors on and off. The injectors can be staged each having  a unique pulse width
if desired. The computer does what it does best and the 555 does it what it does
best. Namely generating pulse widths. The injectors are pulsed when the CAS signal is
sent from the e-shaft tit.

I just bought a high end ARM CPU to do this job :) I hope it is easier to generate
pulse widths than it looks. Computers are not the be all and end all.

Come to think of it this approach will work with the coil on plug ignition system as
well.

I have been spoiled from the point of view of a programming professor by my exposure
to analog circuits :) Namely the CMOS 555.


Paul Lamar

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