Using a dedicated functionality on a processor, I know how to detect touch on a metal pad.
My question is doing it on a pcb in a nice looking way.
I could just expose few large pads (which are metals) and connect them to ports on the processor, it's nice but I want something else.
Can I put the pads on the bottom of the pcb, and draw the buttons right on the top of it so I can sense without touching directly on the exposed pads ?
My concern is that if it works with a single button, then I will not be able to differentiate between multiple because the board is a uniform shape, and if I touch on point A it's like B in terms of capacitance ? ( or at least almost identical because of the noise. )