Common functions for interacting with Microstack node boards (Accelerometer, GPS, etc).
http://python3-microstacknode.readthedocs.org
# disable mmc0 for led
echo none >/sys/class/leds/led0/trigger
# enable mmc0 for led
echo mmc0 >/sys/class/leds/led0
# turn on led
echo 1 >/sys/class/leds/led0
# turn off led
echo 0 >/sys/class/leds/led0