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Jerry, I have a question about the pwm fans.
I made the circuit as pictured in the shematic and wanted to try it with a simple pwm example sketch. It works in the way that the speed of the fan varies, but I get a high whining sound whenever the fans are running.
If I leave out the circuit with the transistors and just use the pwm signal directly on the pwm pin of the fan, I don't have the noise.
In your program, is there some sort of special pwm output to get rid of that whining sound? It's difficult for me to test it with your code without having the full controller.
Thanks for your reply
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