pi_supply_soft_shutdown

# Pi Supply Soft Shutdown Script
# Version 1.1
# Nathan Bookham 2013

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

# Define a variable to store the pin number
soft_shutdown_pin = 7 # Default pin for Pi Supply is 7

# Define a function to run when an interrupt is called
def shutdown():
    call('halt', shell=False)

gpio.setmode(gpio.BOARD) # Set pin numbering to board numbering
gpio.setup(soft_shutdown_pin, gpio.IN) # Set up pin 7 as an input

gpio.wait_for_edge(soft_shutdown_pin, gpio.RISING) # Wait for input from button

shutdown() # Run the shutdown function