So as you move the joystick around its center, its resistance—and therefore its output—varies. The outputs from the potentiometers are analog, so they can have a value only between 0 and 1,023 ...

This is a where a Power Mosfet comes in. With the help of the Power Mosfet, we can use the low voltage output from the Arduino ports to control high voltage/current loads -the popular “12V LED strips” ...

Then, we’ve added on flexible input and output circuitry, and an easy to use software library, to make working with analog signals as easy as blinking an LED.