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CPU Fan Control


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#1 Jerfy

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Posted 31 October 2011 - 07:19 PM

I want to be able to control the fan speed of a normal CPU fan using my NetDuino board. This would be one of the small CPU fans that are common on most intel processors. What is needed to control the speed of a CPU Fan? Should I start with PWM CPU, and if so how do I control it? Thank you for you feedback, Jeff

#2 monewwq1

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Posted 31 October 2011 - 11:56 PM

I've controlled 12VDC CPU fans using an NPN transistor and a PWM port on the Netduino. It works fine. Edit: I am trying to find a nice diagram for you. I will upload it here once I do.

#3 monewwq1

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Posted 02 November 2011 - 01:28 AM

File did not attach. See below reply.

#4 monewwq1

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Posted 02 November 2011 - 01:29 AM

See the attached file. I use this for reference all the time. While it is an Arduino, the same wiring for the motor (or in your case the CPU brushless motor), battery/power supply, and FET applies for the Netduino. For the FET in the diagram, I use a TIP120 Darlington transistor. I usually add a ~1K resistor in line with the PWM port as well. I've controlled small 12VDC motors and CPU fans with this wiring scheme.

#5 Jerfy

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Posted 02 November 2011 - 01:37 AM

See the attached file. I use this for reference all the time. While it is an Arduino, the same wiring for the motor (or in your case the CPU brushless motor), battery/power supply, and FET applies for the Netduino. For the FET in the diagram, I use a TIP120 Darlington transistor. I usually add a ~1K resistor in line with the PWM port as well. I've controlled small 12VDC motors and CPU fans with this wiring scheme.


Thank you for the diagram, do you by any chance have a schematic?

#6 monewwq1

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Posted 02 November 2011 - 02:25 AM

Thank you for the diagram, do you by any chance have a schematic?


No sorry, that drawing is all I have.




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