It uses a couple of 555 timers, transistors, and passives to sense the presence of metallic objects via a coil of wire. had the right idea when he built his simple induction-balance metal detector. With cheap Raspberry Pis and ESP32s all over the place, it can be easy to forget that many simpler projects can be completed without a single line of code (and with the ongoing chip shortage, it may be more important now than ever to remember that). Sometimes simpler is better - when you don’t need the the computational power of an onboard microcontroller, it’s often best to rely on a simple circuit to get the job done.
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