Recently I was fiddling around with a program on my S3 called Sensor Dump which just dumps the raw data from the various sensors onto the screen, and/or saves them into a CSV file.
Looking at the mag-field data on a graph is pretty interesting. This is where I passed my phone over the top of a laptop power supply.
It occurs to me that you could overlay this data on a camera display and do some kind of really low-resolution magnetic field camera thingie.
Hmm. I wonder how directional it is.
Further tests required.
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