![]() ![]() After a lot of messing around and varying results I was able to get stable outcome by averaging multiple samples on each coil. ![]() The pulseIn function was used to attempt to measure the length of the pulse width of the pulses. This signal is cleaned up through the LM339 voltage comparator which in effect produces a series of pulses that are presented to a digital input pin in the Arduino. The Arduino produces a square wave pulse which is fed into an LC Tank circuit which produces a decaying sine wave signal at a frequency determined by the resonant frequency of L & C. The heart of the detector is the Arduino Nano Atmega328 which is used to measure the pulse width of a signal which passes through each search coil. The goal of this project was to have some fun exploring the use of multiple search coils, use light rather than sound to indicate detection and also house everything in the head of the detector. ![]()
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