Fan Control Strategy

The AIBOX-1684X fan operates at 4 levels:

Main controller current temperature	Fan operating level
≥ 40°C	1
≥ 55°C	2
≥ 65°C	3
≥ 85°C	4

Warning

As the device box temperature rises, the level rises automatically in step.

Check the CPU temperature:

    cat /sys/class/thermal/thermal_zone0/temp

Check the development board temperature:

    cat /sys/class/thermal/thermal_zone1/temp

Check the fan level:

    cat /sys/class/thermal/cooling_device0/cur_state

Check the maximum fan level:

    cat /sys/class/thermal/cooling_device0/max_state

Modify the fan level:

    echo 1 > /sys/class/thermal/cooling_device0/cur_state

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