Checklist

Sensors do not go into detect or have unknown results

Multiplexing pins used by QTouch libraries in your design

Check the Pins used for QTouch or QMatrix acquisition methods do not overlap with the applications usage of the ports

Signal values report arbitrary values

Stray capacitance

Check the sensor design and minimize stray capacitance interference in your design

Waveforms of charging / discharging of channels do not show up properly in oscilloscopes

JTAG ICE connected to the board

Try disconnecting the JTAG ICE completely from the kit

When using the example applications, the debug values for some of the channels does not display appropriate values

JTAG Pins are enabled in the target.

JTAG Pins have to be explicitly disabled in the main.c file.

/*  disable JTAG pins */
MCUCR |= (1u << JTD);