Strictly speaking, a Theremin uses a pair of antennae that act as capacitors in a specific R/C circuit. Looking at [aritrakdebnath2003]’s MIDI THEREMIN, we see it works differently, but it does play ...

Unexpeced approaching behind when riding frightened me sometimes, although ready made products are in the market, I made bicycle radar demo. Limitations LD2410 covers 4~5m, so it can miss fast ...