cat /etc/init.d/low_bat_shutdown
#!/bin/bash
# LiPoPi
# Shut down the Pi if the GPIO goes high indicating low battery
# GPIO Port
gpio_port= »15″
# Enable GPIO
if [ ! -d « /sys/class/gpio/gpio$gpio_port » ]; then
echo 15 > /sys/class/gpio/export || { echo -e « Can’t access GPIO $gpio_port » 1>&2; exit 1; }
fi
# Set it to input
echo « in » > /sys/class/gpio/gpio$gpio_port/direction || { echo -e « Can’t set GPIO $gpio_port to an input » 1>&2; exit 1; }
# Set it as active high
echo 0 > /sys/class/gpio/gpio$gpio_port/active_low || { echo -e « Can’t set GPIO $gpio_port to active high » 1>&2; exit 1; }
# If its low (low battery light is on), shutdown
if [ « `cat /sys/class/gpio/gpio$gpio_port/value` » != 1 ]; then
echo « Shutting down due to low power `date` »
/sbin/shutdown -h now || { echo -e « Can’t halt the system » 1>&2; exit 1; }
fi