Megasquirt has some interesting stuff for wideband controllers:

http://www.megamanual.com/PWC/

But it all gets obviated by this thread:

http://www.msextra.com/forums/viewtopic.php?f=67&t=22147

Basically, you can spend a lot of time and energy hacking together a
circuit that will turn a narrowband AFR sensor into a wideband, and then
more time and energy building a controller for it,
-OR-
You can spend $200 for an LC-1 that puts out a calibrated/linear 0-5V
signal out of the box, and replace the sensor for $60 if it ever goes bad.

I've done my share of experimenting, and chose to go with the LC-1.
It's working exceptionally well so far.



Charlie England wrote:
> You can find interesting stuff in the most unexpected places....
>
> -------- Original Message --------
> Subject: [Small4-strokeEngines] wide-band o2 sensor DIY project
> Date: Sat, 26 Nov 2011 10:01:51 -0000
> From:
> Reply-To: Small4-strokeEngines@yahoogroups.com
> To: Small4-strokeEngines@yahoogroups.com
>
>
>
>  
>
> I know nothing about these folks except what I just read on their web
> site. They offer plans to build a wideband O2 sensor display thingee.
> Dunno tital cost of project. This is a commercial sevice, they charge
> for the complete write-up. Think they may offer ready-made PCBs for
> each project too, not sure.
>
> http://www.siliconchip.com.au/cms/A_111598/article.html
>
> Thanks, Steve!
>
> GeoB
>
>
> __,_._,___