# Use the Raspberry Pi to detect motion and send an email
# When the motion sensor is tripped it will send an email with a duration of motion detection. The duration is so that it might be easier to determine if the motion sensor is being set off by an intruder or something else like changes in light.
# All you need is the Pi and a motion sensor. The motion sensor that I used is the Parallax PIR Sensor (Rev B).
# My setup is as follows
# pin1 -> Vcc on PIR Sensor
# pin15 -> Out on PIR Sensor
# pin6 -> GND on PIR Sensor

import RPi.GPIO as GPIO
import smtplib
from email.mime.text import MIMEText
from time import time

def send_email(message):
        msg = MIMEText(message)
        msg['Subject'] = 'RaspberryPi detected an intruder'
        msg['From'] = '<source>@gmail.com'
        msg['To'] = '<destination>@gmail.com'
        # send email
        s = smtplib.SMTP('smtp.gmail.com',587)
        s.starttls()
        s.login('<source>@gmail.com', '<password>')
        s.sendmail(msg['From'], msg['To'], msg.as_string())
        s.quit()

def run_alarm_system():
        print "Alarm System Engaged"
        while 1:
                try:
                        if GPIO.event_detected(15):
                                if(GPIO.input(15)==GPIO.HIGH):
                                        start_time = time()
                                else:
                                        motion_time = time() - start_time
                                        print "Seconds of continuous motion: " + str(motion_time)
                                        send_email("Continuous motion for ~"+ str(motion_time) + " seconds")
                except KeyboardInterrupt:
                        GPIO.cleanup()
                        print "Alarm System Disengaged"
                        break
        GPIO.cleanup()

def init_GPIO(detection_mode=GPIO.BOTH):
        GPIO.setmode(GPIO.BOARD)
        GPIO.setup(15, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
        GPIO.add_event_detect(15, detection_mode)

init_GPIO()
run_alarm_system()