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Edit by Andrew Optimus Goldberg:

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[* black] Check out the potentiometers as we jog that dial…
[* black] What's a potentiometer, you ask? Good question.
[* black] A potentiometer is a special resistor that has multiple terminals and an adjustable voltage divider.
[* black] A mechanical action, in this case the movement of the joystick, adjustschanges the resistance of each potentiometer. Measuring the voltage divider, allowing different voltages to flow through each terminal. The difference in voltages is "read" at each terminal to determine how much you are tiltingpotentiometer indicates the joystickjoystick's deflection along two axes, pinpointing its position.
[* black] A mechanical action, in this case the movement of the joystick, adjustschanges the resistance of each potentiometer. Measuring the voltage divider, allowing different voltages to flow through each terminal. The difference in voltages is "read" at each terminal to determine how much you are tiltingpotentiometer indicates the joystickjoystick's deflection along two axes, pinpointing its position.