Shutdown script for Raspberry Pi

shutdown.py

#!/usr/bin/env python
#
# Shutdown script for Raspberry Pi
#
# Based on
# http://www.forum-raspberrypi.de/Thread-tutorial-hoch-und-runterfahren-mittels-taster-incl-status-led
#
# Watch LOW level on pin 5 to enter sleep mode
# Use power LED as status LED on pin 35: BLINK = confirm button
import os, time
import RPi.GPIO as GPIO

# Power LED
LED = 35

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

GPIO.setup(LED, GPIO.OUT)
GPIO.output(LED, True)

# MUST be GPIO3, no chance to change!
GPIO.setup(3, GPIO.IN)

count = 0

# Start the loop for every .3 seconds, waiting for 3 times LOW on pin 3
while True:

    if not (GPIO.input(3)):
        # Count button pressed
        count = count + 1
    else:
        # Reset counter
        count = 0

    # Button was pressed for at least 3 loops (~1 sec.)
    if count >= 3:
        # Blink 5 times
        for i in range(5):
            GPIO.output(LED, False)
            time.sleep(.1)
            GPIO.output(LED, True)
            time.sleep(.1)

        # Power off LED
        GPIO.output(LED, False)

        # Halt
        print("::: Shut down now ...")
        os.system("shutdown -h now")

    # Loop
    time.sleep(.3)