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Pi 5 Custom Active Fan setup

brex2048

I am trying to setup a custom fan setting so that it will come on sooner, just to help keep it cooler. I have found the config.txt, how do I actually set a custom fan profile. The file is blank right now.

  • 0

    You might try looking at this link how-to-customize-raspberry-pi-5-fan-speeds. 

    Here is the relevant info from that discussion:

    "You are correct that the device-tree is where this is configured, but the dtb file is the compiled device-tree which isn’t (directly) editable. However, in this case we don’t even need to edit the device-tree itself because the values you want to tweak are parameterized and can be customized simply by adding some lines to /boot/firmware/config.txt.

    Firstly, the reference file you want to have a look at is /boot/firmware/overlays/README. This text file documents all the available device-tree overlays, and their parameters. It also documents the parameters for the base device tree, which is what we’re interested in here.

    Search for fan_temp0 in that README file and you should find yourself at the start of the various fan-related parameters in the base device-tree. I’ll quote them here, but you should double-check in that file in case they’ve changed across kernel versions:"

    ***********

    fan_temp0 Temperature threshold (in millicelcius) for 1st cooling level (default 50000). Pi5 only.
    fan_temp0_hyst Temperature hysteresis (in millicelcius) for 1st cooling level (default 5000). Pi5 only.
    fan_temp0_speed Fan PWM setting for 1st cooling level (0-255, default 75). Pi5 only.

    fan_temp1 Temperature threshold (in millicelcius) for 2nd cooling level (default 60000). Pi5 only.
    fan_temp1_hyst Temperature hysteresis (in millicelcius) for 2nd cooling level (default 5000). Pi5 only.
    fan_temp1_speed Fan PWM setting for 2nd cooling level (0-255, default 125). Pi5 only.

    fan_temp2 Temperature threshold (in millicelcius) for 3rd cooling level (default 67500). Pi5 only.
    fan_temp2_hyst Temperature hysteresis (in millicelcius) for 3rd cooling level (default 5000). Pi5 only.
    fan_temp2_speed Fan PWM setting for 3rd cooling level (0-255, default 175). Pi5 only.

    fan_temp3 Temperature threshold (in millicelcius) for 4th cooling level (default 75000). Pi5 only.
    fan_temp3_hyst Temperature hysteresis (in millicelcius) for 4th cooling level (default 5000). Pi5 only.
    fan_temp3_speed Fan PWM setting for 4th cooling level (0-255, default 250). Pi5 only.


    The syntax for customizing these is a little strange, but not too difficult. In /boot/firmware/config.txt you need to add lines with the format dtparam=PARAM=VALUE. For example, if you want to change the base temperature at which the fan turns on from 50°C to 55°C you might append the following (bearing in mind the value is in millicelcius):

    dtparam=fan_temp0=55000

    You can list multiple parameters in a single dtparam= line like so:

    dtparam=fan_temp0=55000,fan_temp0_speed=90

    Alternatively, you can use multiple dtparam= lines, if you prefer:

    dtparam=fan_temp0=55000
    dtparam=fan_temp0_speed=90

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