Yet another variable fan controller for the RaspberryPi.
This script is based on the instructable tutorial of Aerandir14 available at this link.
The main differences are:
- set/get-able parameters
- the fan speed value ([0-100] %) is written to a file (optional)
- packaged as a snap for easier distribution
$ sudo snap install pi-fan-ctrlYou should then connect the snap interface,
$ snap connect pi-fan-ctrl:hardware-observe
$ snap connect pi-fan-ctrl:gpio pi4-devel:bcm-gpio-21The parameters are all set/get-able through the commands:
snap get/set pi-fan-ctrl <parameters>The available parameters and their default values are as follows,
# Fan control configuration
gpio: 21 # BCM used to drive transistor's base
fan_min: 20 # [%] Fan minimum speed.
sleep: 1 # [s] Time to wait between each refresh
pwm_freq: 25 # [Hz] Change this value if fan has strange behavior
hyst: 1 # Fan speed will change only of the difference of temperature is higher than hysteresis
fan_speed_out: True # Whether to write the fan speed to a file or not
# !!! Not yet configurable !!!
#
# Configurable temperature and fan speed steps
# temp_steps: [50, 55, 60, 65, 70] # [C]
# speed_steps: [30, 47.5, 65, 82.5, 100] # [%]Finally, if fan_speed_out: True the fan speed will be written to a file
in the snap. To retrieve the current fan speed simply issue,
$ cat /var/snap/pi-fan-ctrl/common/fan_speed
45