Arduino MetalDetector

This Arduino Colpitts Metal Detector is a continuation and modification of two previous projects. The code and circuit is a complete re-write by S. Zihlmann of the version by Evan Kale (both projects found online) that improves the reliability of the circuit. I added a couple features to the circuit and code- specifically an OLED Display that shows the Oscillator Frequency (and any deviation if metal is detected) and a Battery Level Monitor.

This version uses an Arduino ProMini 5v ATmega328 instead of the Nano. For ease of assembly, all thru-hole parts as used.

The Search Coil that must be constructed consists of a 20 to 25 Turns of 24guage Magnet Wire on a round 20inch form.

Inductance of the coil (L1) should be approximately 280uH to 420uH, which should oscillate approximately 110KHz to 135KHz.

No other adjustments are needed for this circuit.

Circuit is unverified, but code does compile!