Hello
I"m a power electronics designer and I have designed controllers and switching system for motors from few wats to 25KW. ping me with your exact needs to proceed forward.
depend on how much control do you want and what type of fan do you control
AC, DC, High voltage
Speed Control, interfacing 3 pin/2 pin
I can make all the controller based on Arduino/IC 555 (simple)
I have good hands on PCB designing with the tools like cadstar 18 and allegro 16.3, with a 1.5 year of experience on PCB designing.
Your requirements is quite simple and I can do it with ease for you.