Injector Pulse Time Schematic Wanted and O2 Meter comments

[Bruce Bowling]

> 
> I recently built the O2 Meter shown in the Projects page. This has been
> of enormous help in understanding what my BMW Motronics system is up to.
> 
> However, I find I'd also like to know what is going on in terms of injector
> pulses under different circumstances. I know there are some commercial
> LED meters that show low to high injector pulsing. Does anyone have a 
> schematic for such a thing?
> 
> 

A few weeks ago, I posted info on how to make an analog gauge version
of a pulse width meter from a PIC processor. I also posted the code which
ran it. I offered to post the schematic (it is very simple) but then my 
network connection was lost for a few weeks and so I am not sure if anyone
wants the info.

The circuit could be adapted to an LED, or better yet maybe an intelligent
LCD (Hitachi-controlled). The analog gauge is nice in that it is cheap and
will easily show trends. I used a 1 milliamp movement, but any movement will
probably work.

- Bruce


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                 Bruce A. Bowling
                 Staff Scientist
   Thomas Jefferson National Accelerator Facility
    12000 Jefferson Ave - Newport News, VA 23606
                 (804) 249-7240
bowling at cebaf.gov  http://devserve.cebaf.gov/~bowling
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