The problem I had with sensors tracking the sun was coming up with an alternative means of finding the correct orientation when the weather is overcast. Even on an overcast day, it's somewhat better for the array to face where the sun is behind the clouds. There may be a great alternative; I just couldn't think of one. The look up tables, however, are error free and very precise, and the controller can sleep between moves which is a very low power state. It wakes every hour, moves to the place where it will be exactly facing the sun in half an hour, and after a five second motor move, goes back to sleep.
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