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The circuit diagram in step 1 doesn't match the discussion. It shows one way a meter (MTR) could be used to measure voltage, using the pot to calibrate the meter. For this discussion, the pot should be connected between +5v and ground 0v, with the tap (wiper) going to the analog input of the Arduino. The diagram confuses the issue. It could also be interpreted as a torque control for a MoToR, varying the current using a series resistance, but this type of pot doesn't normally handle enough current to be used that way. It would be better without this diagram present.
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