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I need to design a 4x4 keypad matrix that will be placed behind a solid aluminium face-plate on an instrument - keys activated by touch. Do anybody know where I can start? I have seen this on some instruments, so it is certainly do-able.
I'm busy with a design for an optical proximity sensor, but I have some difficulty with the lens design (of which I have little experience). Anybody know of software that I can use to design and simulate the lens system?