The closer the metal object gets to the search coil the higher the pitch of the tone emitted so you have an idea of how deeply buried the object is! Learn how to use code to implement a high precision frequency counter and create different pitch tones with a speaker connected to the Arduino. Several software design topics will be covered such as while loops, conditional statements, precision timers, etc. Once the hardware is built, it's time for software development! Then, build a simplified version of a BFO metal detector by winding your own magnet-wire search coil, constructing a Colpitts oscillator on a breadboard, and interfacing it with the Arduino UNO. Start by learning the fundamentals of electromagnetic field theory and how it relates to the operation of the three fundamental types of metal detectors: beat frequency oscillator, pulse induction, and induction balance. Ever wanted to design and build your very own metal detector from scratch?
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