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Capacitive
A capacitive keyboard works on the same principle as a keyswitch keyboard.
This shown by the fact that there is a plunger that serves as the "signaler"
too. One design includes two sheets of semi-conductive material that is
separated by a thin sheet of Mylar. When the user presses a key, the plunger
forces the two sheets together, which changes the capacitance of the two
sheets. The controller reads the value of the capacitance signal, and then
determines the key hit by the user.
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