Security System With Motion Detection

GPIO of the Raspberry Pi can be accessed using the GPIO library which can be imported using the GPIO library.

The libraries such as RPi.GPIO and time are used in this project.

import RPi.GPIO as GPIO 

import time

The GPIO pin is then configured to digital input using the following lines

sensorPIN = 15

GPIO.setmode(GPIO.BCM)

GPIO.setup(sensorPIN, GPIO.IN)

GPIO Pin 15 is configured to use as digital input which reads for every 50ms. Whenever the intruder/human enters in the range, the sensor detects and produces the digital pulse.

while True:               

	if GPIO.input(sensorPIN): # if sensorPIN == 1        

	print "Intruder Alert !!!"    
	
else:        

	print "No intruder"    

	time.sleep(0.05)         # wait 50 milliseconds

Although the above code worked, I had a few false triggering. After going through the documentation from KEMET, The SS-430 produces two output pulses of 200msec per detection. This can be interpreted by the Raspberry pi using the following code:

import RPi.GPIO as GPIO
import time
sensorPIN = 15
GPIO.setmode(GPIO.BCM)
GPIO.setup(sensorPIN, GPIO.IN)
pulse = 0
PyroRead = 0
IR_threshold = 198000
IR_sensed = 0
start_time = 0
end_time = 0
try:
while True:
while(IR_sensed < 2):
            start_time = time.time()
            GPIO.wait_for_edge(sensorPIN, GPIO.FALLING)
            GPIO.wait_for_edge(sensorPIN, GPIO.RISING)
            GPIO.wait_for_edge(sensorPIN, GPIO.FALLING)
            end_time = time.time()
            PyroRead = round((end_time - start_time)*1000000)
            print(PyroRead)

if(PyroRead > IR_threshold):
                IR_sensed += 1
        pulse = pulse + 1
        print(pulse)
        print("Intruder Alert !!!")
        PyroRead = 0
        IR_sensed = 0
        time.sleep(1)         # wait 1 second
finally:
    print("clean up")
    # GPIO.cleanup([sensorPIN])
    GPIO.cleanup() # cleanup all GPIO

Now the sensor can determine the presence of the human within the specified range and view angle.

After a lot of struggles and effort, I have created a library to interface KEMET's pyro sensor with the Raspberry Pi.

The picamera library is installed using the following command

sudo apt-get install python-picamera

Next, we interface the Raspberry Pi Camera Module V2 to the Raspberry Pi. We import picamera library to interface the camera with the raspberry pi. We have set the resolution of the camera at 1024 x 768 so that the images are captured at a lower resolution. This allows us to reduce memory usage and to send the images.

import picamera

with picamera.PiCamera() as camera:
	camera.resolution = (1024, 768)

From the above example, the picture of the intruder is captured by the device which has to be transmitted to the master (owner). First, we add the Smtplib package allows us to set up the Gmail server. Install an SMTP service with the command

sudo apt-get install ssmtp

Make sure that Allow less secure apps setting is turned on for allowing Gmail SMTP Access Authentication.

import glob
import smtplib
import os

These four modules are used to send the emails from a Raspberry Pi:

from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email.utils import formatdate
from email import encoders

We need to add the receiver's email and sender's email address and password, in our case both, are the same email as shown below:

sender = '[email protected]'
password = ' Replace the pass '
receiver = '[email protected]'

By making several adjustments to the code, you can change the Subject, sender address, receiver address, and the content of the body. The images are sorted and the latest image is sent via Gmail (SMTP).

We have also added two relay circuit and a manual reset push button to the circuit. These are treated as normal GPIO to indicate or to inform the status of the theft alert using LED and Buzzers.

# Set pins 23, 24 to be an output pin and set initial value to low (high), since relay ckt is pull-down mechanism
Green = 23
Red = 24
GPIO.setup(Green, GPIO.OUT, initial=GPIO.HIGH) 
GPIO.setup(Red, GPIO.OUT, initial=GPIO.HIGH) 

# Set pin 14 to be an input pin
reset_button = 14
GPIO.setup(reset_button, GPIO.IN)

while True:           
if GPIO.input(sensorPIN): # if sensorPIN == 1
        GPIO.output(23, GPIO.HIGH) # Turn off Green
        GPIO.output(24, GPIO.LOW) # Turn on Red
if !GPIO.input(reset_button):
            break
else:
        GPIO.output(23, GPIO.LOW) # Turn on Green
        GPIO.output(24, GPIO.HIGH) # Turn off Red
    sleep(0.05)         # wait 50 milliseconds

Step 7: Enclosure