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Table of Contents
LED
Introduction
This document mainly describes the onboard LEDs. You will learn how to control the LEDs.
LED Nodes
VIM1/2
VIM1/VIM2 has only one node.
$ ls /sys/class/leds
sys_led
VIM3/3L
VIM3/VIM3L has two nodes.
ls /sys/class/leds red_led sys_led
VIM4
VIM4 has only one node which is a PWM LED.
$ ls /sys/class/leds
pwmled
Edge1
Edge1 has two nodes.
$ ls /sys/class/leds
read_led sys_led
Edge2
Setup LED
VIM1/2/3/3L
We will use sys_led (white) as an example.
Turn off
Set the LED node parameter to none to turn off the LED:
$ 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:
$ 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:
$ echo heartbeat > /sys/class/leds/sys_led/trigger
You can also try other parameters.
VIM4
Lets use pwmled (white) as an example.
Turn off
Set the LED node parameter to none to turn off the LED:
$ echo none | sudo tee /sys/class/leds/pwmled/trigger
Turn on
Set the LED node parameter to heartbeat, to make the LED flash with a heartbeat rhythm:
$ echo heartbeat | 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:
$ echo heartbeat > /sys/class/leds/pwmled/trigger
You can also experiment with other parameters.
Edge1
We will use sys_led as an example:
- Turn off
Set the LED node parameter to none to turn off the LED:
$ 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:
$ 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:
$ echo heartbeat > /sys/class/leds/sys_led/trigger
You can also experiment with other parameters.