Thumbwheel Potentiometer

Introduction

Potentiometers, also known as pots, are useful electrical components that allow a person or a machine to directly tune the voltage or resistance in one part of a circuit. In its normal configuration, a potentiometer acts as a variable voltage divider. If a voltage source is connected between the two pins, called terminals, the voltage over the third pin, known as the wiper, will vary with the position of the potentiometer shaft. This shaft can, for example, be controlled by a slider or a thumbwheel.

Model

In this example model, a thumbwheel-controlled potentiometer has been connected in its normal configuration. The angular position of the thumbwheel will be increased following a ramp signal, from 0 to 180 degrees. The voltage on the wiper pin is measured with a voltage sensor.

Simulation

To simulate the model, perform this step:

• Click the Simulate button in the top toolbar .

Plot the results

Explore how the voltage on the wiper pin decreases as the potentiometer gets turned around. Plot the stored plot called PotentiometerVoltages by double-clicking it from the Stored Plots section.

You should now see the following graph:

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