4.5.3 QTouch Buttons
ATtiny817 Xplained Mini contains two QTouch buttons for use with the internal PTC module of the device.
To get started using the QTouch buttons, open the QTouch Tiny817 Xplained Mini Selfcap
Example in Atmel START (http://start.atmel.com/#examples).
Tip: The touch button on the kit is placed
in the inner layers of the PCB and has a very small overlay. Due to the short
distance from the sensor to the touch area, it might be oversensitive. Different
overlays can be used to avoid saturation of the sensor.