I picked up one of Forrest Mims III's mini notebooks at Radio Shack,
"Electronic sensor circuits & projects". He has some ideas for making
switches out of pcbs or copper clad boards (for instance, a sensor in which
vibration causes a wire to touch the copper. Anyway, long story short, I'm
thinking of doing something similar, essentially building a pushbutton on a
pcb (a piece of metal that, when pressed, bridges two pads on the pcb), but
I'm worried that the copper might oxidize or something, preventing good
electrical contact.
Any thoughts on the likelihood of that happening? Any ideas to prevent it?
Maybe some sort of conductive coating for the copper?


--m

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