This video will explain about what is mobile compass, how it works and why it needs to be calibrated often..
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Time stamp
00:00 - Intro
01:11 - What is compass?
02:12 - Magneto meter
03:41 - Experiment: Sensor
04:47 - Hall effect sensor
07:32 -Why low accuracy?
08:15 - Why Infinity rotation?
10:41 - End
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