I described a way of making a very sensitive device like this but it requires a lot of experimental setup

Arduino Magic: Building an Easy EMF Detector from Scratch

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The EMF detector showcased in this video utilizes a minimal number of components, making it straightforward to construct without the need for any tuning. It functions excellently right from its initial power-on, requiring no adjustments. Project description An EMF (electromagnetic field) meter serves the purpose of gauging electromagnetic radiation within a specific space. Its function […]

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