Pi Supply Soft Shutdown Script

# Pi Supply Soft Shutdown Script
# Version 1.2
# Nathan Bookham 2013
# Stephen Longhurst 2013

# Import the modules to send commands to the system and access GPIO pins
from subprocess import call
import RPi.GPIO as gpio

# Define variables to store the pin numbers
soft_shutdown_pin = 16 # Default pin for Pi Supply is 7
keep_powered_pin = 18 # Default pin for Pi Supply is 8

# Define a function to run when an interrupt is called
def shutdown():
    # Cleanup GPIO
    gpio.cleanup()

    # Shutdown with halt and power off in 1 minute
    call(['shutdown', '-hP','+1'], shell=False)

# Set pin numbering to board numbering
gpio.setmode(gpio.BOARD)

# Setup the input Pin to wait on
gpio.setup(soft_shutdown_pin, gpio.IN)

# Pin to pull high to keep the Pi Supply giving us power
gpio.setup(keep_powered_pin, gpio.OUT, initial=gpio.HIGH)

# Run the shutdown function
shutdown()