@bleeptrack this might be obvious, but make sure to use lead-free surface finish! I once tried this Arduino code https://playground.arduino.cc/Code/CapacitiveSensor/ and it worked well.
@sebastian true capacitive sensing does not use exposed metal contacts
@bleeptrack it depends on the capacitive touch controller you use; look into its datasheet for recommendation
from an UX perspective, some kind of feedback is absolutely necessary
I personally find capacitive touch most of the time rather annoying and inferior to tactile switches, but there surely are applications where it is the way to go
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