Atmel is offering a touch library for its AVR microcontrollers. The library consists of precompiled and verified binary files that can be configured as discrete keys or combined to form wheels and sliders. It resides on the microcontroller rather than on a separate chip, and is available at no additional cost.
The Touch-library is available for download at www.atmel.com/touchswlib together with AVR QTouch Studio, royalty-free front-end software supporting the TS2080A and TS2080B demonstration boards, which support the ATmega88, ATtiny88, ATmega88PA, ATmega168P and ATmega328P, respectively.