Homeassistant compatible PWM fan controller with temperature and humidity sensing
WARNING: There seems to be an issue with ESPHome 2025.7, which is under investigation. For the meantime, please stay on esphome/esphome:2025.6
What is it?
This board is an ESP32-S2-based Wifi Fancont…
WARNING: There seems to be an issue with ESPHome 2025.7, which is under investigation. For the meantime, please stay on esphome/esphome:2025.6
What is it?
This board is an ESP32-S2-based Wifi Fancontroller.
It allows you to control up to 4 independant PWM Fans and read temperature & humdity at the installed location. E.g. you can use a standard 12V 120mm Noctua PC fan as an exhaust for a PC inside a cupboard.
Specs
Basics
12V DC Barrel Input (5.5x2.1mm, max. 2.5A)
4x PWM Fan Output (only limited by 2.5A input limit)
When I built my first rack, I found no readily available solution for controlling PWM fans via HomeAssistant. That's when I decided to make this product.
I'm using it in my network racks for ventilation. Put 2x 120mm PWM fans on top for exhaust, add a internal fan for circulation and you're good to go.
Software Stack
This PCB comes pre-flashed with an ESPHome Factory Image or can be reflashed via a USB or Wifi.
Find the sources for ESPHome here: https://github.com/zeroflow/esphome-fancontroller
Printed Case
By default, the case is printed in silver PLA with black lettering. For custom combinations, please contact me for available options.
If you want mounting holes or other changes to the base of the case, please feel free to contact me.
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Review Breakdown
5
1
4
2
3
0
2
0
1
0
Average Ratings
Product:
(5.00)
Documentation:
(4.00)
Shipping:
(5.00)
Communication:
(4.67)
Jodan |
Aug. 15, 2025
Perfect for any Home Assistant Enthusiast!
G'day from Australia! Similar use cases to other reviewers, this controller is installed within my rack, powering a couple of Notcuas. Looks great, configurations and integration with Home Assistant were very easy to set up. Will most likely buy a couple more of these down the line. Would recommend.
Scott |
July 13, 2025
Exactly what I needed - very good product!
Surprised something like this doesn't already exist since wanting to control fans via Home Assistant seems like a pretty common use case. Used the fan controller to control fans within my server rack which badly needing some cooling and this works perfectly. Documentation could have been more comprehensive - for some reason the api was disabled within the Rev3 ESPHome yaml config which means I couldn't connect to it from Home Assistant out of the box and there was no documentation about how to resolve this so it took a big of digging to work out how to flash a new firmware OTA with the api enabled. Overall very well put together, would recommend.
Response from zeroflow's | July 13, 2025
Hi Scott,
Great to hear it serves you well. This exact usecase is the reason why I built this product in the first place.
Thank you for bringing this up, the missing api config is indeed an oversight when creating the example configuration. As you also noted, the documentation indeed is in some dire need of improvement, which will happen soon.
If you have any other questions, please don't hesitate to ask.
Marius |
March 1, 2025
Perfect
I use it in a grow tent as fan controller, works perfect. Documentation is available on git
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