Security System

In this project, we’ve created a simple security system. The PIR sensor detects if someone passes by, and then the camera activates. If a face is detected, it takes a picture and simultaneously delivers a warning message.

Steps

1. Install the vilib library for face detection.

   cd ~/
   git clone -b picamera2 https://github.com/sunfounder/vilib.git
   cd vilib
   sudo python3 install.py
   

2. Save the following code to your Raspberry Pi and give it a name, for example, security.ty.

   import os
   from time import sleep, time, strftime, localtime
   from vilib import Vilib
   from robot_hat import Pin, TTS
   
   
   # Initialize the TTS class
   tts = TTS(lang='en-US')
   
   # Display all supported languages
   print(tts.supported_lang())
   
   # Initialize the PIR sensor
   pir = Pin('D0')
   
   def camera_start():
       Vilib.camera_start()
       Vilib.display()
       Vilib.face_detect_switch(True)
   
   def take_photo():
       _time = strftime('%Y-%m-%d-%H-%M-%S', localtime(time()))
       name = f'photo_{_time}'
       username = os.getlogin()
       path = f"/home/{username}/Pictures/"
       Vilib.take_photo(name, path)
       print(f'Photo saved as {path}{name}.jpg')
   
   def main():
       motion_detected = False
       while True:
           # Check for motion
           if pir.value() == 1:
               if not motion_detected:
                   print("Motion detected! Initializing camera...")
                   camera_start()
                   motion_detected = True
                   sleep(2)  # Stabilization delay to confirm motion
   
               # Check for human face and take a photo
               if Vilib.detect_obj_parameter['human_n'] != 0:
                   take_photo()
                   # Read the text
                   tts.say("Security alert: Unrecognized Individual detected. Please verify identity")
                   sleep(2)  # Delay after taking a photo
   
           # If no motion is detected, turn off the camera
           elif motion_detected:
               print("No motion detected. Finalizing camera...")
               Vilib.camera_close()
               motion_detected = False
               sleep(2)  # Delay before re-enabling motion detection
   
           sleep(0.1)  # Short delay to prevent CPU overuse
   
   def destroy():
       Vilib.camera_close()
       print("Camera and face detection stopped.")
   
   if __name__ == '__main__':
       try:
           main()
       except KeyboardInterrupt:
           destroy()
   

3. Use the command sudo python3 security.py to run this code.

   Note

   • Q3: Why is there no sound from the speaker?

4. Open a web browser and enter http://rpi_ip:9000/mjpg to view the captured footage. Additionally, you can find the captured face images in /home/{username}/Pictures/.