[stephengillie]

This is a neat little EMF detector. I love seeing Android hobbyist creations. I'm trying to think of uses, but maybe it would make a neat toy, all on its own. You could wander around, and explore the world in terms of EM fields from various sources. Now I want to make one.

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Edit: Thanks for changing the HN title.

Cue shocked reaction that our smartphones continue to process data, update apps, background process things, and collect garbage when the screen is off. This title is so link-baity that it makes me want to not click the link.