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FAN Interface

Interface Test Methods​

  • Connection

    Connect the fan to ROCK 3B as shown here

    fan connection

  • Rsetup select Thermal Governor mode

    1. Open a terminal, type rsetup, select Hardware.
    rsetup hardware
    1. Enter to Thermal governor
    rsetup hardware
    1. The default governor should be power_allocator.
    rsetup hardware

  • power_allocator

    The system defaults to fanless mode or DC fan mode. Ensure that the machine can still work stably without a cooling fan

  • user_space

    1. Select user_space

    2. Locate the fan device with the following command.

    ls /sys/class/thermal/cooling_device*/type 
    
cat /sys/class/thermal/cooling_device*/type
    pwm fan result img

    As shown, pwm-fan corresponds to cooling_device2.

    1. Turn off the fan
    radxa@rock-3b:~$ echo 0 | sudo tee /sys/class/thermal/cooling_device2/cur_state
    1. Set the fan to the highest setting.
    radxa@rock-3b:~$ sudo cp /sys/class/thermal/cooling_device2/max_state /sys/class/thermal/cooling_device2/cur_state

  • step_wise

    When the CPU temperature reaches 60 degrees Celsius the fan starts to rotate.

  • Shutdown and sleep states

    The fan should remain stationary during shutdown and sleep.

  • Refer to

    See more at rsetup thermal-governor section