Quote Originally Posted by cunninghamjohn View Post

Will the pic recognise 2.1v as a logic 1, or will I need to amplify this to 5v to drive the pic?
Hi John, I do not think it will @ 5v as 2.1 is less than 1/2 way, but if you operate a PIC on 3.3v, then I would say yes. Check Microchips web site for PICs made to operate at that voltage.