So you want to control the two CASE fans not the CPU fan? Correct?
Then YES it is very possible. And to simplify the whole thing forget the motherboard temperature control and just create your own Arduino-based temperature-controlled PWM fan controller. Many noobs do this project, one way or another. Even I have two PWM fans controlled in this way in my computer cupboard.
- You need to measure the temperature (see my YouTube video #28 on using the OneWire DS18B20 temperature controller) which is very easy to use for a noob.
- You need to control the fan(s) with PWM (see my YouTube videos #14 & #15 - they go on a bit but contain the information you need, especially #15). You will see my fans in the computer cupboard in this video!
- Put the two things together (ask here if you get stuck with this last step) so the temperature controls the fan speed.
I look forward to your next post when you have successfully completed steps 1 & 2, very straightforward. Or if you get stuck in those steps.
URLs for my videos in the footer of this post. Subscribe too if you find them useful! What a great project for a sunny May weekend.
Those are case fun, but used in a CPU heatsink.
I don't want to make a fan controller with arduino, what i want is to emulate the functionality, that arctic offers with said cooler. So semi passive operation until a certain pwm value.
So the idea is, that arduino reads the pwm values, that motherboard provides and either forwards them to the fan after a certain threshold (like 40%) or ignores them (0% pwm to the fan).
SO the question is really, can arduino read pwm values, that motherboard sends ? Obviously fan control on its own works.