Hello, I am looking to create a fan PWM controller for a PWM fan like a Noctua NF-F12 or similar and control it from HA. I can put an old raspberry pi or another piece of hardware connected to the fan. MQTT, Node-RED or any other crazy ideas welcome. Anyone god any good ideas? Basically I need to control the voltage from about 5-6V to 12V to control the speed.
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Have a look at ESPeasy with an ESP8266 module. You can set a GPIO to output a pwm signal and use MQTT to control it from Hass. Note that you need to use a transistor to drive the fan.
https://www.letscontrolit.com/wiki/index.php/GPIO
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Thanks! I will look into this. 
Zigbee and z-wave (not preferred but possible) are also options.
https://iot-playground.com/blog/2-uncategorised/98-esp8266-wifi-fan-controller-easyiot-coud
This looks like exactly what I need.
at the end, how did you managed to monitor and control a pwm fan? 
Not continued the work here yet. I will, but not right now 
Iām planing a similar project for my Network control cabinet.
Iām thinking to use a Tasmota devices and configure one GPIO port to PWM signal.
I have a 4 wire FAN with 12V, GRD, Tacho, PWM.
So I want connect 12V and GRD to a Power Supply and PWM to the Tasmota GPIO PWM Port
Is this even possible??
Hello, I just got this to work with ESPHome on a ESP32.
Se more here: PWM controlled fan with ESPhome on ESP32