This is an easy tutorial showing how you can control the brightness of an LED or adjust the speed of a DC fan using Arduino Board, a small BC547 transistor and a potentiometer. In my example the whole ...

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Potentiometer: One end is connected to 5V, the other end to ground, and the middle pin (wiper) is connected to analog pin A0 on the Arduino. Working Principle The potentiometer's value is read using ...

A (10K) potentiometer attached to each axis provides proportional feedback of the up/down and left/right positions. The joystick is spring-loaded, so that it always returns to its centered position ...