Quote Originally Posted by malc-c View Post
Yeah I 'spose when you think of it I would need to rectify the AC signal in some way so that there is something for the pic to read.

I'll try the diode / capacitor thing and see what happens.. thanks for the input
Oh it works pretty good, once you get the caps/resistors all set up to the right numbers. I don't remember the values that I used, but I do know I ended up buffering the input with an opamp before going into the diode. I've got a decent pdf of what I did around somewhere. If I find it, I'll link it.