The display unit is also a printed circuit and manages the battery, the display, and the other half of the capacitive sensor. If you want a more detailed explanation of how the sensor actually ...

A simple four-component circuit allows a single I/O line from any microcontroller to sense the states of two capacitive touch sensors. With so many cell phones, PDAs, and MP3 players using touch ...

Capacitive supplies are very attractive for ... With this improvement, we're now on an equal footing with a full-wave circuit, but with a common terminal between the input and the output.