#!/bin/bash
#
# This uses Physical pin 5 - that's one of the I2C pins
#	which is pulled high by the on-board 1K8 resistor.
#	When 'halted' the GPU is monitoring it and if you
#	take it low again, it reboots the Pi
#
gpio -1 wfi 5 falling
echo "Halting now"
/usr/bin/sudo /sbin/halt