doorbell.py

#!/usr/bin/python

import urllib2
import time
import RPi.GPIO as GPIO
from time import sleep

PIN = 17
GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
coupler = True
couplerLast = True
startTime = time.time()
elapsedTime = 0

sonosPath = urllib2.quote('/sayall/there is someone at the door')
sonosUrl = 'http://127.0.0.1:5005%s' % sonosPath

print sonosUrl

try:
        while True:
                if GPIO.input(PIN):
                        coupler = True
                else:
                        coupler = False
                sleep(0.1)

                if coupler != couplerLast:
                        if coupler:
                                elapsedTime = time.time() - startTime
                                print "Elapsed time: %01.2f" % elapsedTime
                        else:
                                startTime = time.time()
                                print "DingDong! Sending to SONOS..."
                                req = urllib2.Request(sonosUrl)
                                try: urllib2.urlopen(req)
                                except urllib2.URLError as e:
                                        print e.reason
                        couplerLast = coupler
finally:
        GPIO.cleanup()