On board PCB traces, in the shape of a Hilbert curve ... but might need some testing to get working properly. There are two capacitive touch sensors which has a TTP223E capacitive touch controller ...

The enhancement of capacitive touch sensing, implemented in the fifth generation of ... If 10mm diameter conductive sense pads are spaced 10mm apart on a PCB, an approaching finger can be reliably ...

Using multi-material 3D printing and computational tools, this work demonstrates an approach to generate and fabricate conductive traces within objects to support capacitive touch sensing. Touching ...