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. In the setup() function the ...

Rather than control the voltage, it’s better to control the current passing through the LED directly. The Simple Approach The easiest thing to do is add a potentiometer in series with the LED.

The most common interactive input control for fading LEDs is a standard potentiometer. However, when you start controlling fade curves via the potentiometer wired to one analogue input of the Arduino, ...

This setup allowed [Alex] to control all 128 LED’s with just seven bits, but it was too slow for him. His solution was to control the multiplexers with counter IC’s. The Arduino can just ...