[PYTHON] Create a visitor notification system using Raspberry Pi

Overview

• As an intercom for detached houses, there is a product that sends a visitor notification by e-mail.
• In rental housing, only the equipment provided can be used and cannot be modified.
• Create a system that takes camera images and sends emails in response to intercom calls

What to prepare

• Raspberry Pi3 Model B (4 is probably okay)
• Case for Raspberry Pi
• Heat sink for Raspberry Pi
• Raspberry Pi3 Model B B + compatible power supply set (5V 3.0A)
• GY-30 Digital Light Intensity Sensor Module I2C
• Camera Module for Sainsmart Raspberry Pi Camera Module for Raspberry Pi
• Jumper wire female-female
• Heat shrink tubing
• Book stand (100-yen shop)

Environment

• Set up the OS of Raspberry Pi and enable I2C https://www.raspberrypi.org/downloads/
  https://www.indoorcorgielec.com/resources/raspberry-pi/raspberry-pi-i2c/
• Be able to send Gmail with mutt http://www.tapun.net/raspi/raspberry-pi-ssmtp-mutt

assembly

Connect the Raspberry Pi, optical sensor (GY-30), and camera as follows

• The pin layout of Raspberry Pi is omitted.
• Install an optical sensor on the screen of the intercom (use the fact that the screen becomes brighter when calling)

programming

• Loop with a while statement in Python, and when the value from the optical sensor reaches 200 Lux or more, Take a picture with the camera and save it in jpg format (overwrite each time you take a picture)
• Temporarily write (overwrite) the date of shooting to a text file body.txt
• Use mutt and Gmail to send an email with the date of shooting in the body guest.sh
• Set a sleep time of 5 minutes (considering calling with the intercom in the room after calling with auto lock)
• Make guest.py start automatically when Raspberry Pi starts

Main program

/home/pi/guest/guest.py

import smbus

import picamera

import time

import subprocess

bus = smbus.SMBus(1)

addr = 0x23

camera = picamera.PiCamera()

while True:

    luxRead = bus.read_i2c_block_data(addr,0x11)

    print("Lux: "+str(luxRead[1]* 10))

    if int(luxRead[1]* 10) > 200:

        camera.capture('/home/pi/guest/image.jpg')

        res = subprocess.call("sh /home/pi/guest/guest.sh",shell=True)

        time.sleep(300)

    time.sleep(1)

Shell script for sending emails

/home/pi/guest/guest.sh

sudo date > /home/pi/guest/body.txt
sudo mutt -s "guest arrived!" [email protected] -a /home/pi/guest/image
.jpg < /home/pi/guest/body.txt

Auto start settings

/etc/rc.local

#!/bin/sh -e
#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.

# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
fi

sudo python3 /home/pi/guest/guest.py &

exit 0

important point

• The light intensity (Lux) to be detected differs depending on the intercom, so adjust it. For types that brighten the screen with a touch panel, check with that function
• Sleep time is adjusted by the distance of the room from the entrance of the auto lock.

Try using

• Because I use online shopping a lot, it is convenient to be notified when there is a visitor when I am absent
• I have been using it for over a year and a half, but it is operating stably.