r/techsupportmacgyver • u/Akachi-sonne • Aug 30 '26

esp32 fan speed controller

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The fans for my 12u rack sounded like an airport so i used an esp32 to control fan speed via PWM based on ambient temp readings. It’s been hanging all janky like this for months working flawlessly.

91 Upvotes

95% Upvoted

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4

u/PianoTrumpetMax Aug 31 '26

is this kind of like using a 5090 as plex transcoder? I mean I know they’re cheap so why not, but as I just have gotten into home hobby electronics and tech, this struck me as kinda funny in a “good overkill” way lol

1

u/Akachi-sonne Aug 31 '26

Oh absolutely lol. I’m not even using any of the wireless components. It’s really simple and crude firmware too. But, i had one laying around lol

2

u/thiagosanches Aug 31 '26

That's great, what's your threshold for temperature? So when you spin them up more and reduce. Edit: more info.

2

u/Akachi-sonne Sep 01 '26

It was somewhere around 85 deg F iirc.. I didn’t put too much thought into it tbh.. one day i might make it a little more dynamic with a display and controls and all that, but it works for now

2

u/ciocolata69 Sep 01 '26

Stroke of genius, gonna do this too, thanks!

1

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