A metal detector used to be an entirely ... In [Łukasz]’s design the ATtiny13 fires a pulse at his coil using a MOSFET, and the voltages at the coil are sensed by an analogue pin through ...

It’s not the greatest design, it might even be the ... it was time to build the rest of the metal detector. Look ma, no MCU! The sensor coil was made by salvaging the wire from an old ...

An advanced metal detector coil encompasses the diameter of the sensor head. Passing current through the MD coil creates an electromagnetic field that induces an electrical current in any metal ...