I have a little project that involves measuring an analog signal that's negative relative to ground, and then displaying the result on some LEDs. The simplest solution, I think, would be to connect the PIC's VDD to ground and VSS to a –5 volt supply. Then the analog signal would fall within the range of the PIC's analog input. This isn't anything that needs surgical accuracy. Has anyone done this before? Anything that I need to beware of?
Obviously I'll be programming it out of circuit.
Obviously I'll be programming it out of circuit.