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Thanks for the extra info, so you used the pot via the controller not to independently control the fan or override the setting from the controller? I wasn't sure if it was possible, I was hoping to have the option to say set the POT to 50% and have it take priority in case the ESP failed since...

Very possible, will report back once I try it later this weekend if I have time. I'm using a low power ESP32 board and only one environment sensor on it plus the fan control so hopefully it doesn't draw any more than the original fan controller would have. I'm not great with electronics, more...

I've ordered a pack of these to try for the 10v to ESP32 power, seems a safe way to do it directly through the USB port of the ESP32 at 5v and let the onboard regulator do it's job the rest of the way: https://www.amazon.ca/gp/product/B08M31FWWG/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Can you explain how you added the 10k POT into the mix? Maybe just a simple wiring diagram to show all of the connections? I don't need the entire thing with LCD etc. just the ESP to MOSFET / POT and to the fan connector, I do understand how the MOSFET is connected to the fan from your...