Scroll up? Details are there on what wires to tap into
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Hi mate
Thanks for the direction 
Yea I read the whole thread before posting my question.
I was hoping to pick his brains, and see if he managed to keep the OG display at all.
Basically I have the same Vevor 8” fan, and want to keep the manual control/display on the wall, but also be able to control the speed via HA as well.
Also, rather than buying a standalone esp32, I have a Uno R4 WiFi so I’m thinking of using that.
Cheers
Would it be possible to use a Shelly to control the fan speed? For example a https://www.shelly.com/products/shelly-0-1-10v-dimmer-pm-gen3
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I’m working on a small PCB to replace the current controller while keeping it plug-and-play with the original fan connector.
The plan is to power the board from the fan’s 24 V, output PWM speed control back to the fan, and let Home Assistant handle the actual logic. The board would also expose a temperature input back to HA.
Has anyone already figured out the exact original connector type?
Yeah!
The motor is always powered directly, and the 0–5V signal only regulates the speed. No signal = maximum speed
- 230V Live → L (Shelly)
- 230V Neutral → N (Shelly)
- Shelly + → Yellow wire (signal)
- Shelly − → Black wire (GND)
When the Shelly is set to 0%, it will output 0V and the motor will stop. At 100%, it will output approximately 5V (with the maximum brightness limit set to 50% since the module is 10v) and the motor will run at full speed. Everything is controlled from Home Assistant, in my case with Zigbee , using Shelly Dimmer 0/1-10V PM Gen4.