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everbarry 2025-12-18 00:54:35 +01:00
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#TODO
* Workings
This project works by setting the following dtparams in =/boot/firmware/config.txt=. Settings require reboot to work.
#+begin_src txt
[all]
dtparam=fan_temp0=55000,fan_temp0_hyst=2000,fan_temp0_speed=90
dtparam=fan_temp1=65000,fan_temp1_hyst=3000,fan_temp1_speed=160
dtparam=fan_temp2=70000,fan_temp2_hyst=4000,fan_temp2_speed=200
dtparam=fan_temp3=72000,fan_temp3_hyst=5000,fan_temp3_speed=255
#+end_src
This project's backend works by setting the following dtparams in =/boot/firmware/config.txt=. Settings require reboot to work.
The RaspberryPi 5 firmware supports up to 4 different [[https://github.com/raspberrypi/firmware/blob/4aa2a51fecb99ce16fe591391f6779174b9b5bea/boot/overlays/README#L271][thresholds]].
The backend validates the new config and only if valid it writes it to disk.
Each threshold is defined by:
1. *fan_tempN*: temperature fan activates at in millicelsius
2. *fan_tempN_hyst*: fan turns off (or to lower setting) when temperature is =fan_tempN - fan_tempN_hyst=. Also in millicelsius
3. *fan_tempN_speed*: fan speed in range [0, 255] where 255 is 100% fan speed
The RaspberryPi 5 firmware supports up to 4 different [[https://github.com/raspberrypi/firmware/blob/4aa2a51fecb99ce16fe591391f6779174b9b5bea/boot/overlays/README#L271][thresholds]].
An example of the additions to your =/boot/firmware/config.txt:=
#+begin_src diff
[all]
+ # Auto-Generated Fan Curve parameters by PiFanUI
+ dtparam=fan_temp0=55000,fan_temp0_hyst=2000,fan_temp0_speed=90
+ dtparam=fan_temp1=65000,fan_temp1_hyst=3000,fan_temp1_speed=160
+ dtparam=fan_temp2=70000,fan_temp2_hyst=4000,fan_temp2_speed=200
+ dtparam=fan_temp3=72000,fan_temp3_hyst=5000,fan_temp3_speed=255
#+end_src
** Defaults
The following are the default values used by the firmware:
#+begin_src txt
fan_temp0 Temperature threshold (in millicelcius) for