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I noticed that with my Android phone, the only things that it will respond to when tapped by are my skin and a stylus. It won't respond to taps by anything else. Not a toothbrush, not my hair, not a rough blanket, nothing other than my skin and a stylus. Why is this? Why does it not respond to taps from objects other than my skin and a stylus? Is there something about the microscopic properties of a stylus and my skin that makes it only respond to those taps? Why does it only respond to these 2 and nothing else?

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  • \$\begingroup\$ Capacitive Sensing. \$\endgroup\$ – Marcus Müller Nov 2 '17 at 6:00
  • \$\begingroup\$ Try something metallic or a wet tissue, this will work as well \$\endgroup\$ – sweber Nov 2 '17 at 6:21
  • \$\begingroup\$ Whatever touches the screen needs to conduct electricity to some degree. Metal does, human bodies do, wet things generally do but plastic things generally don't. Have a good read of this Wikipedia article on touchscreens for a more detailed explanation than you can expect anyone to write out for you. \$\endgroup\$ – Finbarr Nov 2 '17 at 10:28
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Your touchscreen uses Capacitive sensing.

This only works when the touch object is electrically conductive, at the same time some minimum size area needs to be "touched" so that's why not even all conductive objects will work.

The objects you mention are non-conductive so cannot work with a such a touch screen.

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