alt Hacker NewsMSI shipped a genuinely good motherboard and forgot to wire one chip, so PWM doesn't work. Instead of tossing the board or living with the noise, I decided to make lemonade.
An Arduino Nano generates the 25kHz PWM signal, and a companion Windows application reads CPU temp and sends the duty cycle over serial. The Arduino firmware is open source (MIT).
Replies
gzread • today at 8:34 AM
What if Windows crashes? It's better to attach a thermal sensor to the heatsink, I think.
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Could you use an audio out port for creating the signal and ditch the Arduino?