PIC Based Metal Detector

This project is a metal detector using a frequency counting approach. It can generate an audio output, or connect to a computer using a 5 V

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The circuit for this project consists of an LC oscillator with a frequency of around 4 MHz and a PIC microcontroller which can count the oscillations. The inductor is a detector coil, with an inductance that changes slightly in the presence of metal. The PIC's PWM output is connected to a small current buffer amplifier so that the metal detector can be used without being attached to a computer.

The microcontroller is responsible for counting the number of oscillations over a fixed period of time. When audio output is enabled, the firmware automatically calibrates itself - adjusting the expected count, the deviation from which the frequency of the audio output is derived.

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