I have a PWM control box made for standard 4 pin PC type fans (12v). It has a potentiometer to control the fan speed via PWM. It is powered by its own 12v supply. I would like to exchange this manual potentiometer with one that is controlled by a 0-10V signal. The 0-10v signal is coming from an aquarium controller and is intended to adjust an LED driver. I can program this aquarium controller to vary the voltage based on sensor inputs. Ideally adjusting fan speed based on temp/humidity/pH sensors via the 0-10v output.
My biggest concern is not damaging the expensive aquarium controller (source of 0-10v). I obviously need to crack open the PWM fan controller and measure the potentiometer.
I'm having difficulty figuring out what I need to use or search for. A digital potentiometer seems close, but needs more inputs than I can provide.
Fan PWM: https://noctua.at/en/na-fc1