[Diy_efi] Re: Minimalist micro based EFI ?

[Mike]

Yeah interesting,

It seems to me it should be possible to use a smaller micro and
do a classic spi type latched output for things like injectors
and digital non-time critical outputs, similarly with inouts.
This issue about lots of timers is a bit of a red-herring, it
boils down to ram and effective use of a RTC, you can have as
many timers as you have ram,

So it boils down to a fast enough CPU, some basic 10 bit adc
and ram... There should be lots of processors that can handle that
and still have room for tables... etc

rgds

mike



At 08:18 AM 3/11/03 +0100, you 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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