What should be a properties of a body so a contact with it can be detected by a capacitive touchscreen or a touchpad?
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According to the wikipedia article, capacitative sensors detect things with conductive or dielectric properties; so to me, that means these sensors detect a contrast in the electrical properties between your finger, say, and the air around it.
I just tested this out on my touchpad with a metal ruler and if I pushed down, I got a little bit of response.
j.c.
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