DIY-WB bar graph display

[Timothy J Burgess]

I designed a level shifting stage that puts the WB circuit output in the 0
to 1 volt range when its output is in the range of 1.4 to 2.4 volts, which
corresponds to 10:1 to 14:1, and a mux to select either the NB sensor
output (at part throttle) or the level shifted WB sensor output (at WOT) as
the ECM O2 sensor input.  This allows the use of a Diacom, Autoxray, etc.
to log the WB O2 output @ WOT, in the range of interest.  I also designed a
30 LED bargraph display using 3 LM3914's in dot mode for use at the
non-level shifted WB output. I'll post the schematics as soon as I test the
operation of the circuits.

Tim Burgess


Date: Mon, 18 Sep 2000 13:19:18 -0400
From: "Bruce" <nacelp at bright.net>
Subject: Re: DIY-WB bar graph display

Yes, and then dropped it, the WB's output is no where near linear in
nature,
your AFR expects a linear input.   There is no simple answer for doing
that,
least that I've heard of
Bruce



From: "Jeff Bromberger" <blownz at home.com>
Subject: Re: DIY-WB bar graph display
> sounds cool... has anyone thought about making a simple conversion
interface
> to convert the DIY-WB output to a 0-1 volt range?  not trying to
linearize
> it or anything fancy like people have talked about with PICs, just want
to
> put it in the voltage range of a NB o2 sensor so that I can hook it up to
my
> autometer a/f ratio gauge...

> > Bruce Roe has been kind enough to design & test a 40-LED bar
> > graph display. This device is intended to be used with the current
> > DIY-WB O2 system.
> > I've dropped a package into incoming named:
> >     WB-DISP.ZIP
> > This contains schematics, parts list and a theory of operation. If not
> > found in incoming there is a good possibility that Steve has moved it
> > to the DIY-WB area of the web site (Thank you Steve).

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