Raspberry Pi Safe Shutdown + Restart Switches

shutdown.py

# Safe Shutdown/Restart Switches
# untested

shutdownPin = 5
restartPin = 15

GPIO.setup(shutdownPin, GPIO.IN)
GPIO.setup(restartPin, GPIO.IN)

shutdownStatePrev = True
restartStatePrev = True


while True:
    # grab the current state of the buttons
    shutdownStateNow = GPIO.input(shutdownPin)
    restartStateNow = GPIO.input(restartPin)

    # check to see if button has been pushed
    if shutdownStateNow != shutdownStatePrev and shutdownStateNow == False:
        # shutdown
        subprocess.call("sudo shutdown -h now", shell=True,
          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        shutdownStatePrev = shutdownStateNow

    elif restartStateNow != restartStatePrev and restartStateNow == False:
        # Reboot
        subprocess.call("sudo reboot", shell=True,
          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        restartStatePrev = restartStateNow

    time.sleep(.5)