How to control the PWM Fan on ODROID-H3

First of all, you should enter the BIOS setup menu to enable the ODROID-H3's Fan.

1. Power off your ODROID-H3.
2. Press the Power button on your ODROID-H3, then Press “DEL” key while booting.
3. You can see the pic as follow.

You can adjust the CPU temperature level to turn on / off the system FAN automatically. And you can also adjust the Fan's speed with PWM.
The maximum PWM value that you can set is 255 in BIOS but the maximum RPM of the Hardkernel official PWM Fan is 2000.
The middle PWM value 127 is about 1000 RPM when converted to Fan's speed.

https://www.hardkernel.com/shop/92x92x25mm-dc-cooling-fan-w-pwm-speed-sensor-tacho/

Note that the temperature values are the CPU package temperature.

Move to the Save & Exit tab. And then, select the “Save Changes and Exit” menu.