[mircemk] shows how to create a simple non-contact proximity sensor using little more than an Arduino Nano board ... so by using a few materials to create an open-style capacitor, one can monitor ...

It features over 5,400 projects, ranging from simple tutorials — like using a soil moisture sensor with Arduino — to more ...

It’s something [mircemk] demonstrates, with an Arduino-powered magnetic field ... looks as though it has been made from PCB material, with the sensor protruding on what seems to be the shell ...