[Diy_efi] Re: Minimalist micro based EFI ?

[Grant Beaty]

> For a minimalist system 8 bits is enough until you are running more than
14PSI boost.

14 psi is a little too minimalist for a lot of people ;)

Mike has a point with the MAF voltage. My airflow doubles from 4v to 5v. The
AVR's 10-bit ADC produces (1024 * V_in) / Reference_voltage. So its got 204
points from 4v to 5v, that seems like it would be suffecient. The last bit
would go from 49.17 to 49.32 lbs/min.

If you _really_ wanted to be accurate, couldn't you use a mux to swap the
reference voltage at a certain point?

Seems silly to skimp on the processor though. My AVR Mega128 was a whopping
$20, insignificant in the grand sceme of things.

Do ECUs do a frequency -> digital conversion in hardware or software?

Grant

----- Original Message -----
From: <bill.shurvinton at nokia.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, March 11, 2003 9:28 AM
Subject: RE: [Diy_efi] Re: Minimalist micro based EFI ?


For a minimalist system 8 bits is enough until you are running more than
14PSI boost.

There are plenty of megasquirts out there with 8 bit A/D and no problems.

Bill

> -----Original Message-----
> From: ext Mike [mailto:erazmus at iinet.net.au]
> Sent: Tuesday, March 11, 2003 1:48 PM
> To: emj14 at columbia.edu; List for general do-it-yourself EFI talk
> Subject: RE: [Diy_efi] Re: Minimalist micro based EFI ?
>
>
> mmmm, I wondering now that 10 bits is just not enough,
>
>

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