Very interesting video on cap sensor design.

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https://www.youtube.com/watch?v=zhzavzyezbw

he has sense plate , ground plate separated horizontally plate fields spread out.
then makes ground plate bigger sense plate, concentrating potential on sense plate.

there this:
https://www.youtube.com/watch?v=zhzavzyezbw

i liking lack of resistors, etc, in second approach, 1-wire cap sense.

i don't bare metal touch because of static , accidents. touch paper on metal better want plastic sheet on paper. button labels print on paper, cover sheet wipes off.




Arduino Forum > Community > Bar Sport > Very interesting video on cap sensor design.


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