Use an Arduino microcontroller to sense invisible electromagnetic fields using wire, a resistor, and an LED.
Aaron ALAI’s EMF detector project is awesomely simple to make and fun to use. An upgraded version can be built using an LED bargraph for more ‘meter-like’ functionality.
original project can be found here –
http://www.aaronalai.com/emf-detector
additional info, and Arduino sketch –
https://makezine.com/2009/05/15/making-the-arduino-emf-detector/
audio/video by Collin Cunningham
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