ARDUINO BASICS : POTENTIOMETERS

POTENTIOMETERS

A potentiometer is a resistor that has a mechanical shaft or screw that can be turned to change its resistance.

A potentiometer is just a variable resistor:

-> The longer the "trace" from W to either A or B, the higher the resistance.

The two schematic symbols for a potentiometer are shown below:

Rotary Potentiometers

These are the most common type of potentiometers, where the wiper moves along a circular path.

Linear Potentiometers

In these types of Potentiometers the wiper moves along a linear path. Also known as slide pot, slider, or fader.

Some Applications of Potentiometers

Potentiometer as a Voltage Divider

The potentiometer can be worked as a voltage divider to obtain a manual adjustable output voltage at the slider from a fixed input voltage applied across the two ends of the potentiometer.

Now the load voltage across RL can be measured as

VL= R2RL. VS/(R1RL+R2RL+R1R2)

Audio Control

Sliding potentiometers, one of the most common uses for modern low-power potentiometers are as audio control devices. Both sliding pots (faders) and rotary potentiometers (knobs) are regularly used to frequency attenuation, adjust loudness and for different characteristics of audio signals.

Comments

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