2020 has, for many of us, led us to make purchases we likely didn’t need and, in a few rarer cases, some that we didn’t know we needed. For me, at the top of the year, I made one of my favorite ...

[mircemk] shows how to create a simple non-contact proximity sensor using little more than an Arduino Nano board, and a convenient software library intended to measure the value of capacitors. The ...