User Manual Orange Pi Zero 3
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Chapt 3. Instructions for use of Debian/Ubuntu Server and Xfce desktop system
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3.5. Onboard LED Light Test Instructions

  • 1) There are two LED lights on the development board, one is green and the other is red. When the system starts, the default display of the LED lights is as follows:

  • U-Boot startup phase: Green off, Red on
  • The kernel boots into the system: Green flashing, Red off
  • GPIO interface PC13 PC12: Green PC13, Red PC12

    The two LED lights on the development board are controlled by software. When you get the development board, you may find that even if the TF card with the system programmed is not inserted into the development board, the two LED lights will be on after the development board is connected to the power supply. This is because the 16MB on the development board SPI Flash will burn a miniature linux system by default when leaving the factory. This system will light up the red light during the u-boot startup phase. After entering the kernel, it will turn off the red light and set the green light to flash. If the linux system in the SPI Flash is cleared, then the two LED lights on the development board will not light up after the power is turned on without inserting the TF card with the system programmed

  • 2) The method of setting the green light on and off and flashing is as follows:

    Note that the following operations should be performed under the root user.

    a. First enter the setting directory of the green light 

    root@orangepi:~# cd /sys/class/leds/green_led

    b. The command to set the green light to stop flashing is as follows 

    root@orangepi:/sys/class/leds/green_led# echo none > trigger

    c. The command to set the green light to be on is as follows 

    root@orangepi:/sys/class/leds/green_led# echo default-on > trigger

    d. The command to set the green light to flash is as follows 

    root@orangepi:/sys/class/leds/green_led# echo heartbeat > trigger

  • 3) The method of setting the red light on and off and flashing is as follows:

    Note that the following operations should be performed under the root user.

    a. First enter the setting directory of the red light

    root@orangepi:~# cd /sys/class/leds/red_led

    b. The command to set the red light to be on is as follows

    root@orangepi:/sys/class/leds/red_led# echo default-on > trigger

    c. The command to set the flashing red light is as follows

    root@orangepi:/sys/class/leds/red_led# echo heartbeat > trigger

    d. The command to set the red light to stop flashing is as follows

    root@orangepi:/sys/class/leds/red_led# echo none > trigger

  • 4) If you do not need the LED light to flash after booting, you can use the following method to turn off the green light flashing

    a. First run orangepi-config, common users remember to add sudo permission

    orangepi@orangepi:~$ sudo orangepi-config

    b. Then select System



    Img 3.6

    c. Then select Hardware



    Img 3.7

    d. Then use the arrow keys on the keyboard to navigate to the position shown in the figure below, and then use the space to select disable-leds



    Img 3.8

    e. Then select Save



    Img 3.9

    f. Then select Back



    Img 3.10

    g. Then select Reboot to restart the system for the configuration to take effect



    Img 3.11

    h. After restarting and fully entering the system, you can see that the two LED lights on the development board will not light up

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