stever / cm4-fan-control-service

Fan control service for Raspberry Pi Compute Module 4. Based on EMC2301 by Shuudoushi.

CM4 Fan Control Service

Fan control service for Raspberry Pi Compute Module 4.

Configuration

vi .env

ELASTICSEARCH_HOST="https://10.43.143.94:9200"
ELASTICSEARCH_PASSWORD="<password>"

Build

mkdir bin
make
./main
sudo ./main set 255 # max speed
sudo ./main set 128 # mid speed

Python setup

sudo pip install gpiozero
sudo pip install RPi.GPIO
sudo pip install python-dotenv
sudo pip install psutil

Service setup

sudo cp fancontrol.service /etc/systemd/system/
sudo systemctl daemon-reload
sudo systemctl enable fancontrol
sudo systemctl start fancontrol
sudo systemctl status fancontrol

Additional service commands

sudo systemctl stop fancontrol # to stop the service
sudo systemctl restart fancontrol # to restart
sudo systemctl status fancontrol # to check status

EMC2301

Software for controlling an EMC2301 via i2c and other standards.

For use with Raspbery Pi using Linux type operating systems.

Download files, navigate to downloaded directory, run sudo make -j 8.

Two commands are currently supported, rpm and set. rpm will print what the fan is doing to the terminal, set along with a value (0-255) will set the fan to that step value.

Examples:

./main rpm <<< Reads what the chip/fan is doing

USE_DEV_LIB 
Current environment: Raspbian
DEV I2C Device
DEV I2C Device
I2C ok !
End Res_value: 437
FAN_SPEED: 8998
---------------------

./main set 255 <<< Sets the chip/fan to maximum

USE_DEV_LIB 
Current environment: Raspbian
DEV I2C Device
DEV I2C Device
I2C ok !
Setting fan to: 255
End Res_value: 508
FAN_SPEED: 7740
---------------------

This is nothing fancy. There is no GUI. There is no automatic temp-fan control. It is command line only to quickly read or set the fan speed of a raspberry pi, nothing else.

Have fun, I'm not responsible for what you do to your own stuff running this code. (But if something sets itself on fire, send me a video of it as it'll be epic.)

(May work with nvidia jetson as well as over SPI and/or GPIO, don't know, haven't tested it, but it seems the waveshare backend has support for it.)