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 ...

In our case fanSpeed will have a value of 32 at tempMin and 255 at tempMax. These values are used to control the speed of the fan using PWM and the analogWrite(). The fanLCD re-maps the temp to allow ...

Now the speed can be controlled with a pot. Once control of the fan was sorted, [tinyboatproductions] decide to add an OLED display to show the fan speed and power condition, which is a nice touch.

Neat hack – I was hoping for a solution that provided a PID feedback on RPM though. I’m using a 1000W light dimmer (with a big brass coloured heat sink) to tame the speed of my router.