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. In this Instructable, I'll demonstrate a simple manual method using both the XLoBorg from Piborg, and ...
By: p_leriche
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from Instructables: exploring - technology - robots http://ift.tt/1KBFQjA
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