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You decide...
If you want your numbers to go from 0-255 put 5V one way. If you want your numbers to go the other way 255-0 put your 5V the other way.
You get to pick.
I try to make my pots run a way that makes sense for me. If I am wiring a motor that turns that pot (through a drive train of course), then I try to have 254 (full forward on the motor) tend to move the pot in the direction of 255 on the pot. This makes sense to me, higher motor outputs makes for higher pot values -- it is very nice for feedback loops as well.
Joe J.
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