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fan.py provides a method that can switch the fan speed.
It should be noted that the x708 does not use a PWM fan, it only supports two speed modes (low speed and high speed). In the fan.py file, the speed mode of the fan is controlled by reading the temperature of the CPU in real time. You need to read the fan.py code to understand more logic.
You can control the fan running at high speed or low speed via modify the CPU temperature threshold in fan.py script file (yellow highlight line)
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'''[PS]''' * If you can't understand, please ignore this step. Because the X708 fan will run at low speed by default, this cooling capacity is sufficient.* You need to create a crontab job, and then put this run command ('@reboot python3 /home/XX/x708v2/raspberry-pi-os/fan.py 'XX' is your username, you need replace it with your username.') into the job, so that the command will run automatically when the device restarts. refer to [X708-Software#FAQ]
9. Uninstall