ESP32 controlling Fan speed (PWM) of networking rack; Turns off when room is in use

[aruffell]

Here I show the system installed:

Network Rack Fan Controller - ESP32 controlling fan PWM based on temperature and override mode when watching movies (for silence)

I have a couple rack cabinets in my Media Room which hold all my networking and NAS gear. Temperature inside the networking rack is always higher than ambient due to all the equipment so my goal is to bring it down as close as possible to ambient. To date I was using an AC Infinity fan controller that was sitting on top of the rack. While this worked relatively well, the fans were quite week and I had no automated way to turn the fans down while watching movies in the media room. Plus… the most …