4.3.4 QTouch® Button
There are two self-capacitance buttons available on the ATtiny3217 Xplained Pro board, which can be used as input buttons for an application. These QTouch buttons are intended to be driven by the built-in Peripheral Touch Controller (PTC) of the device.
To get started using the QTouch buttons and the PTC, there is a similar example project that can be opened here: QTouch Tiny817 Xplained Pro Selfcap Example in Atmel Start (http://start.atmel.com/#examples). The two kits are identical except for the device.
Tip: The touch buttons in the kit
are placed on the inner layers of the PCB and have 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.