control-pwm-fanspeed.py

#!/usr/bin/python3
from pathlib import Path
from threading import Timer

cpu_temp_file = "/sys/class/thermal/thermal_zone0/temp"
duty_cycle_file = "/sys/class/pwm/pwmchip0/pwm0/duty_cycle"
temp_wall = 65000
lowest_fan_speed = 3000

def read_cpu_temp():
    read_temp_file = Path(cpu_temp_file).read_text().replace("\n", "")
    return read_temp_file

def get_current_fan_speed():
    current_fan_speed = Path(duty_cycle_file).read_text().replace("\n", "")
    return current_fan_speed

def set_fan_speed(speed):
    try:
        with open(duty_cycle_file, "w") as speed_file:
            speed_file.write(str(speed))
    except Exception as e:
        print(e)
        return False
    return True

def set_fan_according_to_temp():
    current_cpu_temp = read_cpu_temp()
    current_fan_speed = get_current_fan_speed()
    if int(current_cpu_temp) < temp_wall:
        print("cpu is lower than %s" % temp_wall)
        if int(current_fan_speed) > 0:
            print("going to lower fan speed")
            if int(current_fan_speed) == lowest_fan_speed:
                set_fan_res = set_fan_speed(0)
            else:
                set_fan_res = set_fan_speed(int(current_fan_speed) - 1000)
    else:
        print("cpu is higher than %s" % temp_wall)
        if int(current_fan_speed) < 10000:
            print("going to speed up fan")
            if int(current_fan_speed) == 0:
                set_fan_res = set_fan_speed(lowest_fan_speed)
            else:
                set_fan_res = set_fan_speed(int(current_fan_speed) + 1000)

class RepeatingTimer(Timer):
    def run(self):
        while not self.finished.is_set():
            self.function(*self.args, **self.kwargs)
            self.finished.wait(self.interval)

t = RepeatingTimer(10.0, set_fan_according_to_temp)
t.start()