Potentiometers are very powerful components that allow a variety of cool capabilities when incorporated into a project. A potentiometer is a knob, which can be used to control all manner of different components in your project. The potentiometer is basically a variable resistor, whose resistance depends on the position of the knob. We can use a potentiometer to do things like control the volume in a speaker, or to control the brightness of an LED. If you want to follow along at home, an official Arduino Uno R3 is available HERE. In this new series of lessons, I will be using the sensor and other components found in this KIT.