LED
IQ9 features an RGB tri-color LED driven by the Power Management IC (PMIC). By default, the green LED is set as a heartbeat indicator to reflect the system's operation status and CPU load.
LED indicator descriptions:
- Blue LED (solid on): fastboot mode
- Green LED (heartbeat blinking): normal operation
- Red LED (heartbeat blinking): low-power mode (power input is less than 12V 2.25A).
- Rapid heartbeat: high CPU load
- No heartbeat:
- System crash - Sleep mode - Booting up
Use the following commands under root ("sudo su") to operate the LED:
- Turn off the heartbeat LED
``shell echo none > /sys/class/leds/green/trigger ``
- Turn on the heartbeat LED
``shell echo heartbeat > /sys/class/leds/green/trigger ``
- Set the brightness of the green LED (from 0 to 511. The following example sets it to 100)
``shell echo 100 > /sys/class/leds/green/brightness ``
- Set the brightness of the red LED (from 0 to 511. The following example sets it to 100)
``shell echo 100 > /sys/class/leds/red/brightness ``
- Set the brightness of the blue LED (from 0 to 511. The following example sets it to 100)
``shell echo 100 > /sys/class/leds/blue/brightness ``