My system does not have PWM headers for case fans, so I have been searching for temperature-based fan controllers. I have come across a kit board that does precisely this, albeit using a thermistor, which can only read the ambient case temperature: https://www.amazon.com/gp/product/B077SLWWXL . It seems like a good option, but, at the same time, I wonder if there is a board that can control PWM speed using a USB connection and some software. I am proficient in programming, so I don't necessarily need an end-user-friendly option either. I have searched for this so-called USB-controlled PWM board to no avail. I don't want to use an Arduino, because the breadboard will make the setup bulky. Maybe somebody here has seen something?