Door counter

doorCounter.py

#!/usr/bin/python

# Run this application like this:
# /usr/bin/python /home/pi/doorCounter.py -n label -g 22

# -g: GPIO pin to watch
# -n: label to send to Google Analytics

import RPi.GPIO as GPIO
import time
import urllib2
import sys, getopt
import threading
import random
import os
import sys

GA_CODE='UA-xxxxxxxx-xx'

def main(argv):
  try:
    opts, args = getopt.getopt(argv,"hn:g:",["name=","gpio_pin="])
  except getopt.GetoptError:
    print 'doorCounter.py -n <door name> -g <GPIO pin>'
    sys.exit(2)
  for opt, arg in opts:
    if opt == '-h':
      print 'doorCounter.py -n <door name> -g <GPIO pin>'
      sys.exit()
    elif opt in ("-n", "--name"):
      name = arg
    elif opt in ("-g", "--gpio_pin"):
      gpio_pin = int(arg)

  if 'name' not in locals() or name == '':
    sys.exit("You must pass a name.")

  if 'gpio_pin' not in locals() or gpio_pin < 1 or gpio_pin > 27:
    sys.exit("You must pass a GPIO pin.")

  pidfile = ''.join(['/var/run/doorCounter_',name,'_',str(gpio_pin),'.pid'])

  print "============================="
  print "Door counter started..."
  print "Door name: ", name
  print "GPIO pin: ", gpio_pin
  print "============================="
  print ""

  writePid(pidfile)
  setup(gpio_pin)
  monitor(gpio_pin, name)

def writePid(pidfile):
  pid = str(os.getpid())
  file(pidfile, 'w').write(pid)

def setup(gpio_pin):
  # Use BCM GPIO references
  # instead of physical pin numbers
  GPIO.setmode(GPIO.BCM)

  # Set pin as input
  GPIO.setup(gpio_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)

  while GPIO.input(gpio_pin)==0:
    time.sleep(0.10)

def send(name):
  uuid = name + "." + str(random.randint(100000,9999999))
  urllib2.urlopen("""http://www.google-analytics.com/collect?v=1&tid=%s&cid=%s&t=event&ec=%s&ea=person""" % (GA_CODE,uuid, name) ).close
  print "--sent"

def monitor(gpio_pin, name):

  Current_State  = 0
  Previous_State = 0

  try:

    while True :

      # Read PIR state
      Current_State = GPIO.input(gpio_pin)

      if Current_State==0 and Previous_State==1:
        print "Sensor blocked..."
        Previous_State = 0
        threading.Thread(target=send(name)).start()

      elif Current_State==1 and Previous_State==0:
        # Sensor has returned to ready state
        print "--ready"
        Previous_State = 1

      # Wait for 100 milliseconds
      time.sleep(0.10)

  except KeyboardInterrupt:
    print "============================="
    print "  Quitting"
    print "============================="

    # Reset GPIO settings
    GPIO.cleanup()

if __name__ == "__main__":
   main(sys.argv[1:])