Controlling Raspberry Pi 2 LEDs

rpi-led-notes.md

Commands for controlling the Raspberry Pi 2 LEDs.

See rpi-leds for a node module that does this.

Power (PWR) LED

• OK (ACT) LED = led0
• Power (PWR) LED = led1

Allow access

echo gpio | sudo tee /sys/class/leds/led0/trigger
echo gpio | sudo tee /sys/class/leds/led1/trigger

Heartbeat effect

echo heartbeat | sudo tee /sys/class/leds/led0/trigger
echo heartbeat | sudo tee /sys/class/leds/led1/trigger

Timer effect

echo timer | sudo tee /sys/class/leds/led0/trigger
echo timer | sudo tee /sys/class/leds/led1/trigger

Turn on/off

echo 1 | sudo tee /sys/class/leds/led0/brightness
echo 0 | sudo tee /sys/class/leds/led0/brightness

echo 1 | sudo tee /sys/class/leds/led1/brightness
echo 0 | sudo tee /sys/class/leds/led1/brightness

Revert back to default setting

echo input | sudo tee /sys/class/leds/led1/trigger
echo mmc0 | sudo tee /sys/class/leds/led0/trigger

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Notes

Resources

• http://raspberrypi.stackexchange.com/questions/697/how-do-i-control-the-system-leds-using-my-software
• http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=99445

LED trigger original values:

pi@raspberrypi ~ $ cat /sys/class/leds/led1/trigger
none mmc0 timer oneshot heartbeat backlight gpio cpu0 cpu1 cpu2 cpu3 default-on [input] rfkill0
pi@raspberrypi ~ $ cat /sys/class/leds/led0/trigger
none [mmc0] timer oneshot heartbeat backlight gpio cpu0 cpu1 cpu2 cpu3 default-on input rfkill0