[James Eckert] got his hands on a Freescale MPR121 capacitive touch sensor. The chip in question speaks I2C and senses up to twelve simultaneous capacitive sense electrodes; break-out boards are ...

Capacitive sensing libraries for the Arduino ... buttons can easily be made into a smallish keyboard, and the radial touch sensor will emulate the ‘wheel’ interface on an iPod.

the BlackBerry Storm 2 didn't have a capacitive touchscreen, but was instead the first and remains the only smartphone to have a full clickable touchscreen powered by piezoelectric sensors under ...