DIY-WB bar graph display

[Brian Renegar]

If your using the WB as O2 input to your ECM, did you also flip the voltage
"direction"?  Narrow band O2's increase in voltage with richening mixture.
But the DIY-WB is just the opposite.  That could cause some MAJOR problems!!


>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.
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