[Diy_efi] Re: Minimalist micro based EFI ?

[Perry Harrington]

Marcell,

A guy over on the MegaSquirt list dropped a 128 into the MS
hardware and rewrote most of the software in C.  He just
announced it a week or 2 ago, so it shouldn't be hard to find
in the Yahoo archives.

--Perry

On Tue, Mar 11, 2003 at 08:18:32AM +0100, Marcell Gal wrote:
> Hello Mike, 
> 
> > MAF, analog, 10 - 12 bits, what resolution are people using ?
> > Adjust MAF, 10 - 12 bits, is 10 bits enough ?
> > Temp, analog,  10 bits should be plenty ?
> > O2, analog, 10 - 12 bits, is 10 bits enough ?
> > CAS, 2 digital timing to prescaler/counters
> > Injector outputs, 4, 6, 8 to suit coil types
> > Aux air control, PWM - 1 digital line
> > TPS, mine is a pulsed with idle switch so all digital.
> 
> I think 10 clean AD bits (with proper analog levels)
> should be enough for any of the analog signals here.
> (I mean without much oversampling - of course). 
> 
> You cannot make it much simpler than megasquirt.
> I'd like to make it with atmega128 one day, with an
> event-queue based approach to have lotsof outputs with
> precise timing control(seq. injector and ignition) without
> hardware support (TPU) for that many channels. 
> 
> I heard a guy was about to do something similar (atmega128),
> but I could not find him, although sharing a pcb would
> be nice. The board will be quite general,
> usable for many other purposes. (and low cost btw).
> http://x-dsl.hu/genboard/
> I hope one day I'll have time to go and finish it.
> If anyone is up to it, I will assist of course. 
> 
> Marcell
> 
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-- 
Perry Harrington			Data Acquisition & Instrumentation, Inc	
perry at dainst dot com					 http://www.dainst.com/

Those who would give up essential liberty to purchase a little temporary safety
deserve neither liberty or safety. Nor, are they likely to end up with either.
                             -- Benjamin Franklin

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