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I built an EMF detector for Halloween with a HIDIOT (the ATTiny board I developed a while ago). It’s a really quick and easy project, should take 30 minutes if you’ve already built your HIDIOT.

If you want to try it on an Arduino, the final code should be portable, you just need to make sure you use an analog pin.

I’ve seen lots of expected EMF but also some unusual findings too… almost… spooky!

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    That’s a cute little project, and well-documented.