[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 ... and the radial touch sensor will emulate the ‘wheel’ interface on an iPod. Very cool stuff, and we can’t wait to see these in a few more ...

Newer models sport gesture and swipe functionality too. The iPhone 16 series, for example, uses a similar capacitive sensor for its Camera Control button to zoom in and out. These can be used as ...