ArduRoller balance bot

Caveat Emptor: (I don't want to put you off building one but I also don't want you to be disappointed.)  This Instructable is now 2 years old.  Many of the parts it uses are out of date (there's no drop-in replacement for the now-discontinued gyro, for example) and I've had reports that the code is hard to compile.  If you're not comfortable with the principles behind the electronics, code and the maths inv ...

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