Ahh...yes the PIC12671. Well I guess this is a good use as any for the A/D input.

I know the PIC makes things a lot easier to change through software changes, versus an analog approach (I'm also a digital person so I understand), was there another reason that you didn't want to use the 555 timer to set some on/off duty cycle via the RC constant? It just seems like using a PIC is almost like using a Cray as an adding machine, but as with anything more power/flexibility the better laugh

Just another curious electronics junky.

Ken.