I actually have a working'ish prototype of this project laying on my table right now.
It's a 120mm noctua fan being controlled by pwm i relation to the temperature. It also has an oled screen to show temp and fan speed. All controlled trough home assistant via esphome.
I say working'ish because the temp sensor i'm using (dht11) is unreliable and is messing up half the time, so i'm looking into buying a DS18B20 instead.
I'd be happy to share schematics and code if you'd like it.
this post was submitted on 02 Jul 2025
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You're pretty rad, y'know that?
Thanks. 😀
I had to use 4 different sources to make my project work.
It wouldn't be nice to force others to go trough the same amount of trouble when i already have the files.
That would be amazing thanks, I've barely worked with Arduino but I just ordered a starter kit to play around with and learn.
I made a git repo with the schematic and yaml file for you, if you have any questions feel free to ask.
I may not know the answer, but i'll do my best to help.
If you want to do this as an ESP project anyway, you don't need the extra controller.
Fans take a simple PWM signal, which your ESP (or even one of the smallest Arduinos) can create easily.
Good point, I found this: Tutorial - How to control a PWM fan with an ESP32 and Home Assistant ( https://www.youtube.com/watch?v=9-AZF6udg-Q ) I'm just going to do that but with more fans
I think pretty much any mosfet / h-bridge / motor control board with pwm should do.
If you have those 4-wire fans with a pwm input that accepts 3V3 logic, you might even be able to attach them directly to the ESP:
But that's not all fans, I had some mixed results with that.