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Computer Fan Speed Modifier (in Under 30 Minutes)
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I like that idea. Will give it some thought. Will have ro find some hood tech info on how PWM works to build something like thay.What arduinos have sufficient outputs for such a thing Two front fans would be tge same but other 2 or 3 may need to run at different speeds... hmmmm.Cheers.
I could see a couple ways of approaching your problem. I think the simplest would be to take the code and add a second input. Duplicate the code that measures the PWM signal and have it measure the PWM signal from both motherboards. Have the code take the greater of the two results and drive that out to the fan hub which would then drive all the fans. If you find an Arduino with enough PWM outputs, you could even replace the fan hub with the Arduino and have it drive the PWM signals to all the fans.
I have 2 systems in one case and want to be able to run the case fans irrespective of which system is on and which off. This means I can't use the fan controller on either mobo as if that was off then there would be no case cooling for the other system. Would this project be able to control a number of fans via a fan hub? I have 2 x 140mm fans, 1 x 120mm fans and want to add another 1 or two fans as well. I have a fan hub that allows up to 6 fans to be connected.Thanks
It seemed it but too much for me at first glance, but with al the cheap 'duino clones about... I say: "Thank you my good man, for pointing this solution out to all of us.".Furthermore, the sketch you provided is pretty darn elaborate.Thanks for sharing BricCrafts!
You're very welcome, hope it works out for you.
For me, cost-wise, this was free, since I already had all the parts lying around. If you already have a fan but need to buy and Arduino, it would be about the same as buying a new fan: buying a new 4-wire fan was going to be $8-$10 for the size I wanted, or you could get an Arduino Pro Mini for $10. The tricky part is that it's tough to know what the "right" fan is. I couldn't find any list of approved fans from the motherboard manufacturer (other than for the CPU heatsink, but I was looking for a larger diameter case fan). And the documentation for what PWM duty-cycle my motherboard was outputting was inconsistent (and in the end, I found it to be wrong). In one place, it said that standard duty cycle was 50%. In another, it said 30%. When I measured it (I had the Arduino spit out the measurements to the serial port), I found that it was 20%. And without knowing what the PWM duty cycle is, you don't know what RPM it will spin at, and thus you won't know if your fan will meet the motherboard's thresholds or not.
Wouldn't it be cheaper and more effective to just buy "the right fan"?
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