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Joe, we need a LOT more info about what you are trying to do?
For starters:
What problem are you trying to solve?
What temperature?
What is the fan voltage, current?
What sensors can you get or have?
What power supply do you have?
Thanks for the reply.
The aim of the project is to automatically turn on/off the fan with respect to the room temperature(20C-25C). Increase in speed of the fan with respect to temperature is also an advantage.
I will use a dc power supply with a 12V-24V(0.2A-0.5A)