Hi Chuck,

How about my "555 Timer as A/D Converter" project?
http://www.bobblick.com/techref/projects/a2d555/a2d555.html

Cheers,

Bob


Charles Craft said:
> I'd like to prove to myself that you can measure a voltage using a RC
> circuit and a PIC. It's well documented but I would like to build a
> simple circuit where I can modify R and C values and watch the curve
> change on a scope.
>
> Anyone ever build or know of a circuit that uses a 555 timer to
> demonstrate this? I just want the 555 to generate a steady square wave -
> don't care about the time constants associated with it.

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