As you may have noticed the BPi has a green LED, which starts blinking as soon as the Pi is powered on: i.e. as soon as something happens with the SD card. It is possible to program the behavior of the LED such as switching it off. To list the available options open a terminal and enter cat /sys/class/leds/green :ph24 :led1 /trigger . The default value is heartbeat . If you want to permanently switch it off the trigger needs to be set to none . user@lemaker ~ $ cat /sys/class/leds/green:ph24:led1/trigger none battery-charging-or-full battery-charging battery-full battery-charging-blink-full-solid ac-online usb-online mmc0 timer [heartbeat] backlight gpio cpu0 cpu1 default-on user@lemaker ~ $ sudo su root@lemaker:~# echo none > /sys/class/leds/green:ph24:led1/trigger The LED may be manually turned on and off using the brightness file. The minimum is 0 (i.e. off), and the maximum is 255. To switch it on: root@lemaker:~# echo 1 > /sys/class/leds/green:ph24:led1/brig
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