There are several types of cheap magnetometer now available, which you can use to sense a compass direction, but all of them (as far as I know) need calibration before you can get sensible results.I describe a manual method for doing this in another Instructable, but in this one I'm going to show yo...
By: p_leriche
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from Instructables: exploring - technology - robots http://ift.tt/1LzAiLK
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