libfancontrold

Libfancontrold is the base library for fancontrold, a system daemon written in rust that controls your computer's fans depending on various configurable sensor inputs.

Usage

Just add this to your Cargo.toml file:

[dependencies]
libfancontrold = "0.2"

Cargo-Features

• async: Build the asynchronous version of this library.

Configuration

Libfancontrold supports configuration in json format.

The configuration must have the following structure:

{
    "channels": [channel objects]
}

Each channel object needs to have the following fields:

• "hwmon_device_path": The path to the to be controlled fan's hwmon device. "/sys/devices/platform/nct6775.2592" or something similar.
• "index": The index of the controlled fan.
• "temps": An array of temperature objects to derive the fan speed from. There must be at least one temperature object in this array or a path in "virtual_temps". Each temperature object needs to have the following fields:
  • "hwmon_device_path": The path to the temps's hwmon device.
  • "index": The index of the temp sensor.
• "virtual_temps": An array of file paths to derive the fan speed from. There must be at least one path in this array or one temperature object in "temps".
• "control": An object with one of two fields:
  • "Anchor": Temperature that should be maintained independently of thermal load.
  • "Curve": An Object with pairs of temp and pwm values that form a curve like this:

"control": {
    "Curve": {
        "40": 50,
        "50": 100,
        "60": 200
    }
}

Optional fields for channel objects:

• "mtf": If there are multiple objects in the temps array, this field determines the way which one of the temps will be checked to calculate the fan speed. There are three possible values:
  • "Min" - The lowest temperature is chosen.
  • "Max" - The highest temperature is chosen.
  • "Average" - An average of all temperatures is calculated.
• "min_pwm": (0-255) Minimum pwm value for this channel. Defaults to 100.
• "min_start": (0-255) Pwm value to restart this fan if it stopped. Only used if min_pwm is greater than zero.
• "pwm_mode": The mode of fan speed regulation. It can have the following values:
  • "PWM" - Pulse width modulation. Requires four pin connector.
  • "DC" - Voltage control. Should only be used with three pin fans.
  • "Automatic" - Uses PWM if motherboard connector supports it, DC otherwise. Recommended and default value.
• "average": (1-10) Number of passed seconds to calculate an average temperature from. Can be used to smooth temperature spikes over. Defaults to 1.