Has anyone gotten the official Raspberry Pi 4 fan working on OpenWRT, with active third-pin control using a temperature-monitoring daemon a la Raspbian?
Self-answering - yes, it can be done rather trivially.
You'll need the following modules installed:
and (assuming a standard official Pi 4 fan on GPIO 14) an entry in /boot/config.txt that looks thusly:
(these are the Raspberry Pi Foundation defaults, obviously adjust gpiopin if you've moved yours and temp to taste)
Reboot and enjoy the thermally-dynamic active cooling!
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