Call it synchronicity, or manually setting a 16-bit number in an Arduino, or how to turn an OLED into a rotary dial ...

We set the potentiometer pin as 0 (A0 on the Arduino Uno board), the CONTROL variable is the voltage that is used to cotrol the led brightness of the speed of the fan.

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.