Happily there is a solution in the form of capacitive sensor probes ... The explanation of the probe’s operation is an interesting part of the write-up, unexpectedly it uses a 555 configured ...
A research team led by Professor Jiang Changlong from Hefei Institutes of Physical Science of the Chinese Academy of Sciences ...
Capacitive sensing libraries for the Arduino ... and the radial touch sensor will emulate the ‘wheel’ interface on an iPod. Very cool stuff, and we can’t wait to see these in a few more ...