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What teams used wheel encoders this year?
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Team 122
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How did you build it or did you buy a shaft encoder?
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We bought an optical sensor; we built the encoder ourselves from aluminum and attached it to our jack shaft.
I think we calculated ours to be +- 3 in.
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Did you use them only for autonomous or for the whole match?
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Just autonomous mode.
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How did they work for you?
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They were adequate for our purposes. They did give us some trouble at the beginning, though. One major obstacle we encountered was the resolution of the stamp itself -- about 25 ms if I remember correctly. You might consider using a custom circuit to get better results.
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Do you plan to use it next year?
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Well, I suppose it depends on the game. But if we do then probably get a custom circuit.