70 lines
2.7 KiB
Org Mode
70 lines
2.7 KiB
Org Mode
#+TITLE: PiFanControlTUI
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* Install This
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#TODO
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* Workings
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This project's backend works by setting the following dtparams in =/boot/firmware/config.txt=. Settings require reboot to work.
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The RaspberryPi 5 firmware supports up to 4 different [[https://github.com/raspberrypi/firmware/blob/4aa2a51fecb99ce16fe591391f6779174b9b5bea/boot/overlays/README#L271][thresholds]].
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The backend validates the new config and only if valid it writes it to disk.
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Each threshold is defined by:
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1. *fan_tempN*: temperature fan activates at in millicelsius
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2. *fan_tempN_hyst*: fan turns off (or to lower setting) when temperature is =fan_tempN - fan_tempN_hyst=. Also in millicelsius
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3. *fan_tempN_speed*: fan speed in range [0, 255] where 255 is 100% fan speed
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An example of the additions to your =/boot/firmware/config.txt:=
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#+begin_src diff
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[all]
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+ # Auto-Generated Fan Curve parameters by PiFanUI
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+ dtparam=fan_temp0=55000,fan_temp0_hyst=2000,fan_temp0_speed=90
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+ dtparam=fan_temp1=65000,fan_temp1_hyst=3000,fan_temp1_speed=160
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+ dtparam=fan_temp2=70000,fan_temp2_hyst=4000,fan_temp2_speed=200
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+ dtparam=fan_temp3=72000,fan_temp3_hyst=5000,fan_temp3_speed=255
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#+end_src
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** Defaults
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The following are the default values used by the firmware:
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#+begin_src txt
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fan_temp0 Temperature threshold (in millicelcius) for
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1st cooling level (default 50000).
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fan_temp0_hyst Temperature hysteresis (in millicelcius) for
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1st cooling level (default 5000).
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fan_temp0_speed Fan PWM setting for 1st cooling level (0-255,
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default 75).
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fan_temp1 Temperature threshold (in millicelcius) for
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2nd cooling level (default 60000).
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fan_temp1_hyst Temperature hysteresis (in millicelcius) for
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2nd cooling level (default 5000).
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fan_temp1_speed Fan PWM setting for 2nd cooling level (0-255,
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default 125).
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fan_temp2 Temperature threshold (in millicelcius) for
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3rd cooling level (default 67500).
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fan_temp2_hyst Temperature hysteresis (in millicelcius) for
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3rd cooling level (default 5000).
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fan_temp2_speed Fan PWM setting for 3rd cooling level (0-255,
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default 175).
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fan_temp3 Temperature threshold (in millicelcius) for
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4th cooling level (default 75000).
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fan_temp3_hyst Temperature hysteresis (in millicelcius) for
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4th cooling level (default 5000).
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fan_temp3_speed Fan PWM setting for 4th cooling level (0-255,
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default 250).
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#+end_src
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