odroid-xu4:application_note:led_control [ODROID Wiki]

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We can control the <color #00a2e8>**blue LED**</color> with the trigger mode in sysfs.
The red LED is hard-wired to the power input rail and cannot be changed.

**Turn off**
<code bash target>
su -
echo none > /sys/class/leds/blue\:heartbeat/trigger
</code>

**Turn on**
<code bash target>
su -
echo deafult-on > /sys/class/leds/blue\:heartbeat/trigger
</code>

**Heartbeat (original state)**
<code bash target>
su -
echo heartbeat > /sys/class/leds/blue\:heartbeat/trigger
</code>

There are many other trigger modes. But some of them may not work.
<code bash target>cat /sys/class/leds/blue\:heartbeat/trigger </code>

<WRAP round tip 60%>
If you want to turn the <color #00a2e8>**LED**</color> off automatically in boot process,\\ add <color #ff7f27>echo none > /sys/class/leds/blue\:heartbeat/trigger</color> in /etc/rc.local file
</WRAP>