r/raspberry_pi • u/Nice-Ice7415 • 2d ago

Troubleshooting PWM Frequency of the GeeekPi PWM 40x40x10mm Fan

I'm trying to find the PWM frequency of the latter, GeekPi keeps giving these docs: https://wiki.52pi.com/index.php?title=F-0011 But it does not specify the PWM frequency.

I'm trying to make a custom application with the PI and this fan. I do not care about whether I can cool the PI at this time, just that it works.

I've already tried Searching Reddit, DuckDuckGo, Amazon (where I got it), and ChatGPT but there is not a specific answer (or any answer to be exact).

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u/neruphuyt 2d ago

Looks like the standard for PC style fans is 25kHz and 0-100% duty cycle. There will be some minimum level that the fan starts to spin like 20 or 40%. You can also try different frequencies without harming anything.

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u/LightPast1166 1d ago

PWM fans should start turning at very low duty cycles; down in the single digits. PWM is used because of this ability to greatly and accurately control the speed of the fan/motor or the brightness of an LED.