Dose anyone knows that the onboard red and green LED is controlled by Volumio or controlled by Raspberry Pi？ What’s the meaning of the two LED？
Controlled by the Raspberry kernel and for the 2nd one use google.
By default the red is for power and the green is for SD card activity.
But you can change the behavior by running some terminal commands: D3.js Tips and Tricks: Controlling the Activity LED on a Raspberry Pi
Green LED is led0:
cd /sys/class/leds/led0
The trigger file shows you what options you can use:
$ cat trigger
shows:
none rc-feedback kbd-scrolllock kbd-numlock kbd-capslock kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock timer oneshot [heartbeat] backlight gpio cpu cpu0 cpu1 cpu2 cpu3 default-on input panic mmc1 mmc0 rfkill-any rfkill0 rfkill1
Here is a description of the values: led - Are there other act_led_trigger options besides "mmc" and "heartbeat"? - Raspberry Pi Stack Exchange
To set the value to “cpu” run:
echo cpu | sudo tee trigger
For Red LED repeat the process but using led1:
cd /sys/class/leds/led1
Then you can have the LEDs show CPU or network activity, or even GPIO activity. Perhahps it could be connected somehow to show the audio activity…
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Seems so cool man， It’s awesome！