Dec 02

New page – converting PWM hubs to voltage controlled

New guide up – right here.

My Xen servers main board didn’t have a second PWM controlled fan header to use with a PWM fan hub for the 3 case fans. Its a 4RU case – which has server grade 140mm fans that can draw up to 0.9A each and get up to around 3600 RPM.

So here’s how I used an ATTiny85 to generate a PWM signal from the variable ‘Speed Control’ voltage on pin 2 of the SYS_FAN header.

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