~~tag>LED linux~~
====== LED ======

===== Introduction =====
/*
This page mainly describes the onboard LEDs and leads you to control the LEDs.
*/
This page introduces the usage of Onboard LED indicators under Linux, and leads you to control the LEDs. 

===== Device LED configurations =====

^  Device      ^  Node name                  ^  LED color  ^
^  VIM1/2      |  /sys/class/leds/sys_led    |  White      |
^  VIM3/3L     |  /sys/class/leds/red_led    |  Red        |
|  :::         |  /sys/class/leds/sys_led    |             |
^  VIM1S/VIM4  |  /sys/class/leds/pwmled     |             |
^  Edge1       |  /sys/class/leds/red_led    |             |
|  :::         |  /sys/class/leds/sys_led    |             |
^  Edge2       |  /sys/class/leds/red_led    |  Red        |
|  :::         |  /sys/class/leds/green_led  |  Green      |
|  :::         |  /sys/class/leds/blue_led   |  Blue       |


===== Setup LED =====

<tabbox VIM1/2/3/3L>

We will take ''sys_led'' (white) as an example.

**Turn off**

Set the LED node parameter to ''none'' to turn off the LED:

```shell
$ echo none | sudo tee /sys/class/leds/sys_led/trigger
```

**Turn on**

Set the LED node parameter to ''default-on'' to keep the LED permanently on:

```shell
$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
```

**Set LED heartbeat**

Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:

```shell
$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
```

You can also experiment with other parameters.

<tabbox VIM1S/VIM4>

We will take ''pwmled'' (white) as an example.

**Turn off**

Set the LED node parameter to ''none'' to turn off the LED:

```shell
$ echo none | sudo tee /sys/class/leds/pwmled/trigger
```

**Turn on**

Set the LED node parameter to ''default-on'', to make the LED permanently on:

```shell
$ echo default-on | sudo tee /sys/class/leds/pwmled/trigger
```


**Set LED heartbeat**

Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:

```shell
$ echo heartbeat | sudo tee /sys/class/leds/pwmled/trigger
```

You can also experiment with other parameters.

<tabbox Edge1>

We will use ''sys_led'' as an example:

**Turn off**

Set the LED node parameter to ''none'' to turn off the LED:

```shell
$ echo none | sudo tee /sys/class/leds/sys_led/trigger
```

**Turn on**

Set the LED node parameter to ''default-on'' to keep the LED permanently on:

```shell
$ echo default-on | sudo tee /sys/class/leds/sys_led/trigger
```
**Set LED heartbeat**

Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:

```shell
$ echo heartbeat | sudo tee /sys/class/leds/sys_led/trigger
```

You can also experiment with other parameters.

<tabbox Edge2>
We will use ''red_led'' as an example:

**Turn off**

Set the LED node parameter to ''none'' to turn off the LED:

```shell
$ echo none | sudo tee /sys/class/leds/red_led/trigger
```

**Turn on**

Set the LED node parameter to ''default-on'' to keep the LED permanently on:

```shell
$ echo default-on | sudo tee /sys/class/leds/red_led/trigger
```
**Set LED heartbeat**

Set the LED node parameter to ''heartbeat'', to make the LED flash with a heartbeat blink:

```shell
$ echo heartbeat | sudo tee /sys/class/leds/red_led/trigger
```
The others are similar.
 
You can also experiment with other parameters.

</tabbox>