commit 119ac3fcb225c49dc58156fae41bf268c8cfec70
Author: Carlos Solís <csolisr@openmailbox.org>
Date:   Mon Aug 14 12:08:26 2017 -0600

    Reimporting GIT repository

diff --git a/Presentación.odp b/Presentación.odp
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diff --git a/ProyectoPráctico.odt b/ProyectoPráctico.odt
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diff --git a/ProyectoPrácticoV4.odt b/ProyectoPrácticoV4.odt
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diff --git a/db.csv b/db.csv
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diff --git a/main.py b/main.py
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+import RPi.GPIO as GPIO #This program must be executed as root.
+from subprocess import check_output
+from re import search
+import csv
+import datetime
+import threading
+from time import sleep
+
+#Define file name here!
+fileName = '/home/pi/Desktop/db.csv'
+#Define timeout here!
+#timeoutSecs = 5 * 60 #5 minutes
+timeoutSecs = 5
+#Define number of alarm seconds here!
+cycles = 5
+
+def readIWList():
+	storage = []
+	#now = datetime.datetime.strptime(str(datetime.datetime.utcnow()), "%Y-%m-%d %H:%M:%S.%f")
+	now = datetime.datetime.utcnow()
+	output = check_output("iwlist wlan0 scan |egrep ' - Address: '", shell=True) #Dependency: IWList
+	for i in output.splitlines(True):
+		arrayElement = search('([0-9A-F]{2}([:-]|$)){6}', i).group() #RegExp to obtain the MAC Address
+		storage.append([arrayElement, now, 0]) #Dirty bit defaults to clean
+	return storage
+
+def writeFile(storage, file):
+	with open (file, 'wb') as db:
+		dbfile = csv.writer(db, delimiter='\t', quotechar='"')
+		for j in storage:
+			dbfile.writerow(j);
+
+def readFile(file):
+	storage = []
+	with open(file, 'rb') as db:
+		dbfile = csv.reader(db, delimiter='\t', quotechar='"')
+		for dbrow in dbfile:
+			then = datetime.datetime.strptime(dbrow[1], "%Y-%m-%d %H:%M:%S.%f") #Date reconversion
+			storage.append([dbrow[0], then, dbrow[2]])
+	return storage
+
+def compareTime(time):
+	now = datetime.datetime.utcnow()
+	#Timeout is defined, in seconds, at the beginning of the file.
+	timeout = datetime.timedelta(seconds = timeoutSecs)
+	val = 0
+	if ( abs(now - time) > timeout ):
+		#print "Timeout: " + str(abs(now - time))
+		return 1
+	return val
+
+def buttonPressed():
+	#print "Button pressed."
+	storage = readIWList()
+	file = readFile(fileName)
+	for x in file:
+		for y in storage:
+			if x[0] == y[0]:
+				file.remove(x)
+				#print "Removed " + x[0] + " from the list."
+	for y in storage:
+		file.append(y)
+	writeFile(file, fileName)
+
+def cyclicProcess():
+	file = readFile(fileName)
+	for x in file:
+		if int(x[2]) == 0:
+			if compareTime(x[1]) == 1:
+				x[2] = 1 #Mark dirty bit, timeout achieved
+				#print "Timeout achieved for " + str(x[0])
+	isAlarmTriggered = False
+	storage = readIWList()
+	for x in file:
+		for y in storage:
+			if x[0] == y[0]:
+				if x[2] == 1:
+					isAlarmTriggered = True
+					file.remove(x)
+					#print "Removed " + x[0] + " from the list."
+	if isAlarmTriggered:
+		buzzAlarm()
+		#print "Alarm activated!"
+	writeFile(file, fileName)
+	threading.Timer(timeoutSecs, cyclicProcess,()).start()
+
+def buzzAlarm():
+	for n in xrange(0, cycles):
+		GPIO.output(18, 1)
+		sleep(0.5)
+		GPIO.output(18, 0)
+		sleep(0.5)
+
+#def main():
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(24, GPIO.IN)
+GPIO.setup(18, GPIO.OUT)
+threading.Timer(timeoutSecs, cyclicProcess,()).start()
+try:
+	while True:
+		sleep(0.1)
+		if GPIO.input(24):
+			buttonPressed()
+except:
+	GPIO.cleanup() #Resets the GPIO ports.