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Hi, for direction, two sensors are required, do the ones from mice as in Steve's design below and your design come with two? how is direction handled here as I can see only one sensor, and for the second channel, the second track would need to be offset, but there is only one track?
else is it done by tangentially mounting two sensors using one track, that way one is leading the other? but in that case the two sensor positions would need to be precisely positioned so one is over a dark and the other one over a clear.
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