References
Atmel QTouch Library Peripheral Touch Controller User Guide (
http://www.atmel.com/images/atmel-42195-qtouch-library-peripheral-touch-controller_user-guide.pdf
)
ATmega328PB datasheet (
http://www.atmel.com/devices/ATMEGA328PB.aspx
)
ATmega328PB Xplained Mini kit (
http://www.atmel.com/tools/MEGA328PB-XMINI.aspx
)