Here is a simple capacitive touch switch circuit for electronics hobbyists. Even though the circuit uses smd components, construction of the touch sensor switch is not very hard because the whole ...

The sensor forms an image and OpenCV detects the actual touch configuration. It appears you can use the raw data from the Arduino, too, but it might be a little harder.

The Touch Board is based around an Arduino Leonardo board that also sports an MP3 player / MIDI device, a MicroSD card socket, 3.5 mm audio jack and what Johnson described as the "secret sauce ...