WBO2 LCD digital display

[Enzo Iadevaia]

Hey bob

Thanks,  I just want to display the voltage and then i will convert it using
the table..(Im sure i will memorize it quite quickly)  I found some cheap
LCD displays that have jumpers for 200mv, 20v, 200v, 500v, etc..for about 15
bucks. I also noticed that you can get either a 9v version or a 5v
version... Will i be able to use the 5v version on the diy wb02 board? Or
should i just get a 9v battery and use it that way?


> To just read the voltage so you could look up AFR in a table, you could
> use any digital voltmeter with a 10v setting. To use this particular
> meter you would connect a 990K resistor from the WBO2 output to the
> meter input and a 10K resistor from the meter input to ground. This
> forms a voltage divider giving a 19.99v full scale
>
> An unanswered question is the power source for the meter. Many of the
> cheap panel meters like this require a power supply isolated from the
> measured voltage so you would have to use a separate battery rather than
> the vehicle power.
>
> --
> Robert W. Hughes (Bob)
> BackYard Engineering
> 29:40.237N, 95:28.726W or perhaps 30:55.265N, 95:20.590W
> Houston, Texas "The city with too much Oxygen"
> rwhughe at ev1.net
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