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What about using a seperate board, and have it communicate to the IFI board via a serial connection?
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Well then you would lose your serial port. What you could do is get one of those fancy 360-degree position sensors (they run about $50 though), because it outputs analog voltages, looping back to zero when it gets to the top of its range. You could take the difference in position to get the speed. You would have to gear it down substantially though, since it would be mighty hard to detect limit resets when it's going half a turn every loop.