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Based on the usage of capacitors, condensators. Alternatively, utilizing the derivative of signals.
1
vote
What exactly does a capacitive touch screen need to register input, and how can that signal ...
A capacitive touch screen is one half of a capacitor. To make it work, the equivalent of the remaining capacitor plate is needed. …
30
votes
How to use a capacitive touch screen without a human hand
The grounding (done by laying the phone on a metal plate or sheet) is also capacitive and is the equivalent of holding the phone in your hand. … The idea is that when you hold the phone in your hand, there is capacitive coupling between your hand and the ground inside the phone. …