James-Ansley/pi5_fan_controller.py

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    Raspberry Pi 5 Auto Fan Controller

UPDATE: The fan is now controlled automatically in the latest updates (See this answer https://askubuntu.com/a/1497778/1746852). This cron job is no longer needed.
A quick hack to get around the fact Ubuntu for the Pi5 currently does not control the fan.
This needs to be run with sudo permissions:
sudo python3 pi5_fan_controller.py
And, by default, will monitor the Pi5's temperature for one minute every 2 seconds adjusting the fan based
on some arbitrary boundaries I came up with on the spot :^)
This is intended to be set up as a system-wide cron job (system-wide because of the sudo privileges).
To do this, edit this file:
sudo nano /etc/crontab
And add this cron job:
* * * * *  root  python3 /path/to/pi5_fan_controller.py
(with the updated path to the python file)
Many thanks to the following Ask Ubuntu answers:

https://askubuntu.com/a/15834
https://askubuntu.com/a/1491768


## pi5_fan_controller.py
from enum import Enum
import time

TEMP_PATH = "/sys/devices/virtual/thermal/thermal_zone0/temp"
FAN_PATH = "/sys/class/thermal/cooling_device0/cur_state"


class FanSpeed(Enum):
    OFF = 0
    LOW = 1
    MEDIUM = 2
    HIGH = 3
    FULL = 4


def main():
    start = time.time()
    while time.time() - start < 59:
        temp = get_temp()
        if temp > 70:
            speed = FanSpeed.FULL
        elif temp > 65:
            speed = FanSpeed.HIGH
        elif temp > 60:
            speed = FanSpeed.MEDIUM
        elif temp > 50:
            speed = FanSpeed.LOW
        else:
            speed = FanSpeed.OFF
        set_fan_speed(speed)
        time.sleep(2)


def get_temp() -> int:
    with open(TEMP_PATH, "r") as f:
        data = f.read()
    return int(data) // 1000


def set_fan_speed(speed: FanSpeed):
    with open(FAN_PATH, "w") as f:
        f.write(str(speed.value))


if __name__ == "__main__":
    main()
	from enum import Enum
	import time

	TEMP_PATH = "/sys/devices/virtual/thermal/thermal_zone0/temp"
	FAN_PATH = "/sys/class/thermal/cooling_device0/cur_state"


	class FanSpeed(Enum):
	OFF = 0
	LOW = 1
	MEDIUM = 2
	HIGH = 3
	FULL = 4


	def main():
	start = time.time()
	while time.time() - start < 59:
	temp = get_temp()
	if temp > 70:
	speed = FanSpeed.FULL
	elif temp > 65:
	speed = FanSpeed.HIGH
	elif temp > 60:
	speed = FanSpeed.MEDIUM
	elif temp > 50:
	speed = FanSpeed.LOW
	else:
	speed = FanSpeed.OFF
	set_fan_speed(speed)
	time.sleep(2)


	def get_temp() -> int:
	with open(TEMP_PATH, "r") as f:
	data = f.read()
	return int(data) // 1000


	def set_fan_speed(speed: FanSpeed):
	with open(FAN_PATH, "w") as f:
	f.write(str(speed.value))


	if __name__ == "__main__":
	main()