In the hardware setup, MCP41010 is connected to the Arduino via the Arduino’s SPI Interface. Potentiometer terminals A (pin 5) and B (pin 7) are connected to the Arduino 5-volt supply (5 V) and Ground ...

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 ...

So he grabbed an Arduino, potentiometers and a button and hacked together what a joke-yoke. The genius part of this hack is the way [Christopher] used his desk drawer for pitch control.