The analog input is read and the result is printed in the Serial Monitor. When the shaft is turned all the way in one direction, there are 0 volts going to the pin, and the input value is 0. When the shaft is turned all the way in the opposite direction, there are 5 volts going to the pin and the input value is 1023. In between, analogRead()
returns a number between 0 and 1023 that is proportional to the amount of voltage being applied to the pin.
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