For those that want to build arduino projects without programming try XOD.io
dennis@home laid this down on his screen :
the direction is hard, maybe a grey scale encoded disk and some optical
sensors unless someone has an easier way?
A tiny magnet fixed on the moving disk and four or eight tiny reed
switches around the circumference, is what some commercial systems use.
If the 'tail' of the vane, forms a Y from above, there will be less
tendency for the vane to flutter in the wind.
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