PIC driven UEGO

[Rausch, Bernd]

Datalogging sounds great. If you can log rpm, MAP and AFR, this would be
an exceptional tuning tool. You could import the data in Excel for
viewing and further processing (eg calculate how far you are off your
desired AFR, so you can multiply this factor with your current injection
times).

regards,

Bernd Rausch

-----Ursprüngliche Nachricht-----
Von: The Punisher [mailto:punisher454 at hotmail.com]
Gesendet: Mittwoch, 21. Februar 2001 09:50
An: diy_efi at lists.diy-efi.org
Betreff: PIC driven UEGO


I have been working on PIC driven O2 meters for a while now and I see
that 
the EGOR schematic has been posted.
I would realy like to update My design to use A UEGO instead of the HEGO
I 
have been using. The Schematic and Excel documents are great, but I
would 
like some more info on what it takes to drive the sensor. I would like
to 
try to reduce the hardware requirement and do more with software.

My current project is a PIC based O2 meter that collects the voltage
from 
the HEGO (12 bit),corrects the output curve through a lookup table, and
do 
some some basic math. Then the AFR (aprox, but consistent) is displayed 
numericly and graphicly on a 2x20 LCD (also have a 2x40 version).
The display on this device looks awesome, and this kicks butt on all the
led 
AFR meters I have seen. The bargraph is 100 pixels wide (200 on the 40
char) 
and is relative to AFR# NOT just voltage. I also display the millivolt
level 
on the bottom with the AFR number. My design would easly expand to allow

multiple sensor readout and dataloging/replay.

I think this would work great with a UEGO. ANY information would help
alot.

Marvin Fugate (The Punisher)
punisher454 at hotmail.com
67 Pro-Street Camaro 427 BBC
84 S-10 406 SBC
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