PCB Grounding Techniques for Plated PCB Mounting Holes
Whenever you place your board into an enclosure, it will need to mount to that enclosure somehow. In order to provide a secure mount without damaging the surface of the PCB with a screw, it's typical to simply place plated through holes in the corners. These PCB mounting holes generally have the pad exposed beneath solder mask so that, if needed, the mounting point can be connected electrically back to one of your nets. One question that often...