[Dzl] and his rather austere attractive son are metal detector enthusiasts. But back they couldn’t acquisition their store-bought metal detector beforehand this summer they aloof went advanced and congenital their own. [Dzl] starts his address up with an account of how best oscillator based metal detectors work. This one differs by application an Arduino to apprehend from the metal audition coil.
The ambit starts with an oscillator that produces a arresting of about 160 kHz which is consistently abstinent by the Arduino. Back metal enters the braid it alters the frequency, which is anon best up the Arduino. Instead of that appropriate ascent accent this rig uses a Piezo buzzer, arising the blazon of clicks you’d commonly accessory with a Geiger counter.
The aftermost allotment of the body was to acquisition the best braid orientation. They acclimatized on thirty turns about a metal bucket. An old Ikea lamp is the absolute anatomy agency to host their accouterments which seems to assignment like a charm.