Smart Doorbell using Raspberry Pi

About a year ago, I had to do a project titled Smart Home Automation using a Raspberry Pi and Arduino, part of the project  incorporated a doorbell but not just any doorbell but a Smart doorbell.

Why do I call it a Smart Doorbell?

A classic doorbell can be defined as a signalling device typically placed near an entry door to a building. When a visitor presses a button the bell rings inside the building, alerting the occupant to the presence of the visitor.

The smart doorbell, works in that manner however when a visitor presses the doorbell button it notifies the occupant with an images of the visitor and also sends an email, sms and push notification (to an smart device) to the occupant in case they are not able to hear the bell ringing.

If the button is pressed a pre-recorded voice notification is played for the occupant to check the door as there might be someone, this happens concurrently with an sms notification while a picture of the visitor is captured and sent to both email and push notification. Initially there was a feature to enable 2-way real-time video communication but due to network latency and high resource usage the feature was deprecated.

Click For A Demo

Comment if you need the code

See code snippets(Initial Revision): https://mmphego.wordpress.com/2015/01/11/smart-doorbell-using-rpi-with-voice-and-email-notification/

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System V init script(start-stop-daemon)

I’ve been looking for efficient ways to start at boot my NodeJS dependent applications, with inspiration from https://gist.github.com/alobato/1968852, I modified it to my own needs.

Link might interest you as well:
http://big-elephants.com/2013-01/writing-your-own-init-scripts/
https://www.cyberciti.biz/tips/linux-write-sys-v-init-script-to-start-stop-service.html

Copy template to /etc/init.d and rename it to something meaningful. Then edit the script and enter that name after Provides:(between ### BEGIN INIT INFO and ### END INIT INFO).

#!/bin/bash
# Inspired by https://gist.github.com/alobato/1968852
# Needs Provides, Descriptions

### BEGIN INIT INFO
# Provides:
# Required-Start: $all
# Required-Stop: $all
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description:
# Description:
### END INIT INFO

set -e
NAME=""
PIDFILE="/run/$NAME/$NAME.pid"
# Application one wants to upstart
DAEMON=""
DAEMON_OPTS=""
# Run as user
RUN_USER=""
RUN_GROUP=""
function daemon_run {
	mkdir -p /run/$NAME
	chown $RUN_USER:$RUN_GROUP /run/$NAME
	start-stop-daemon --start --background --quiet --chuid $RUN_USER:$RUN_GROUP --chdir /run/$NAME --pidfile $PIDFILE --make-pidfile --exec $DAEMON $DAEMON_OPTS
}
exec > /var/log/$NAME.log 2>&1

case "$1" in
start)
	echo -n "Starting $NAME ... "
	daemon_run
	echo "done."
;;

silent)
	echo -n "Starting $NAME in silent mode ... "
	daemon_run
	echo "done."
;;

stop)
	echo -n "Stopping $NAME ... "
	start-stop-daemon --stop --quiet --oknodo --pidfile $PIDFILE --remove-pidfile
	echo "done."
;;
restart|force-reload)
	echo -n "Restarting $NAME ... "
	start-stop-daemon --stop --quiet --oknodo --retry 30 --pidfile $PIDFILE --remove-pidfile
	alexa_run
	echo "done."
;;
*)
	echo "Usage: $0 {start|stop|restart}"
exit 1
esac
exit 0

When done,

sudo systemctl enable 'name_of_filename'
reboot

Mpho

Installing latest Node.js on Raspberry Pi B+

So, I’ve been battling with updating my node.js via apt-get, for some apparent reason seems like they’ve discontinued updates or maybe I’ve been doing it wrong all along – who knows.

But I found a way to bypass apt-get and go back to the basics.
Note: This assumes that the latest release is node-v7.4.0, else you can go to https://nodejs.org/dist/latest and get the required build.

This assumes the Raspberry Pi is running Rasbian – Jessie

# Download Node.js source Raspberry Pi Model A, B, B+ and Compute Module

wget -qO- https://nodejs.org/dist/latest/node-v7.4.0-linux-armv6l.tar.gz | tar xvz
cd node-v7.4.0*

# Raspberry Pi 2 Model B

wget https://nodejs.org/dist/latest/node-v7.4.0-linux-armv7l.tar.gz | tar xzv
cd node-v7.4.0-linux-armv7l

# and lastly
sudo cp -Rv * /usr/local/

# That's it! To check Node.js is properly installed and you have the right version, run the command:

node -v

Mpho

Android WebView App (to Apache server)

Yippyyyy!!!

Just successfully created my first Android App.

So I have been playing around recently with modifications, improvements and configurations on my current project – “Smart Home using Raspberry Pi & Android with Voice Recognition.”

I have been thinking of implementing a simple Android application which directly opens up URL, rather than going to my browser each and every time I need to access the web control server(Apache2).

So one might be wondering what is exactly this WebView ‘nonsense’ a simple Google search gave me this definition, A “webview” is a browser bundled inside of a mobile application producing what is called a hybrid app. Using a webview allows mobile apps to be built using Web technologies (HTML, JavaScript, CSS, etc.) but still package it as a native app and put it in the app store.

Now coming back to the App, i’m using the latest Android Studio, source code below.

mpho

Main_Activity.java

//__author__ = "Mpho Mphego"
//__description__ = "Android WebView App controlling Raspberry Pi running Apache2"
//__version__ = "Revision: 1.0 "
//__date__ = "Date: 2015/01/17 22:23 "
//__url__ = "mmphego.wordpress.com"
//__copyright__ = "Copyright (c) 2015 Mpho Mphego"
//__license__ = "Java"

package com.wordpress.mpho112.mobilehomectrl;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebSettings;
import android.webkit.WebView;


public class MainActivity extends ActionBarActivity {
    private WebView mWebView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mWebView = (WebView) findViewById(R.id.activity_main_webview);
        // Enable Javascript
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        mWebView.loadUrl("http://172.18.20.41/");
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Activity_main.xml


<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    tools:ignore="MergeRootFrame">

    <WebView
        android:id="@+id/activity_main_webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</FrameLayout>   

Smart Doorbell using RPi with voice and email notification.

Part of my project involves having a doorbell, I figured a simple doorbell whereby a visitor just presses a button and then it rings/ notify whoever is it the house, That’s not really creative in my point of view.

So I then decided why not have a doorbell that not only rings when the button is pressed but also tell you someone is at the door and then sends you an email notification just in case you might be away(Not able to hear the bell.) as well as log the time that the button was pressed.

IDEA: It would be really cool if I had a USB Webcam that would take a picture of the person visiting and emails it.

first things first, we’ll need to create the wav file ie TextToSpeech. Using this simple tool below.

pico2wave -w DoorNotify.wav "Someone is ringing the doorbell. Please Go Check"

Next, create a python script that will watch the state of GPIO pin 18 on the RPi and take some action when the doorbell brings it to ‘HIGH’.

#!/usr/bin/env python2.7
__author__ = "Mpho Mphego"
__version__ = "$Revision: 1.1 $"
__description__ = "Smart Doorbell Notifier with voice and email notification : Interrupt driven"
__date__ = "$Date: 2015/01/11 02:23 $"
__copyright__ = "Copyright (c) 2015 Mpho Mphego"
__url__ = "mmphego.wordpress.com"
__license__ = "Python"

import RPi.GPIO as GPIO
import time
import os

# Connect to Relay which will control the 12V Buzzer.
led = 17 #GPIO0
button = 18 #GPIO1

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(led, GPIO.OUT)
time.sleep(0.1)
GPIO.output(led, False)

# GPIO 1 set up as inputs, pulled up to avoid false detection.
# Both ports are wired to connect to GND on button press.
# So we'll be setting up falling edge detection for both
GPIO.setup(button, GPIO.IN, pull_up_down=GPIO.PUD_UP)

# define callback functions
# this will run when an event are detected
def buttonHandler(channel):
    print "falling edge detected on 18"
    GPIO.output(led, True)
    time.sleep(1)
    GPIO.output(led, False)
    os.system("aplay /home/pi/Scripts/Smart_DoorBell/DoorNotify.wav")			
    os.system("python /home/pi/Scripts/Smart_DoorBell/DoorBellLogger.py")
    time.sleep(1)
    GPIO.output(led, True)
    time.sleep(1)
    GPIO.output(led, False)

# when a falling edge is detected on port 1, regardless of whatever 
# else is happening in the program, the function buttonHandler will be run
GPIO.add_event_detect(button, GPIO.FALLING, callback=buttonHandler, bouncetime=5000)

try:
    print "Waiting for button to be pressed"
    while True:
        # To ease the CPU Usage have a 10s delay on while loop.
        time.sleep(10)
        continue
except:
    GPIO.cleanup()       # clean up GPIO on CTRL+C exit
GPIO.cleanup()           # clean up GPIO on normal exit
print "Clean up by resetting all GPIO"

Now for the fun part, the email notification and data log.


#!/usr/bin/env python
__author__ = "Mpho Mphego"
__description__ = "Doorbell notifier time logger and email notifier."
__version__ = "$Revision: 1.0 $"
__date__ = "$Date: 2015/01/10 02:09 $"
__copyright__ = "Copyright (c) 2015 Mpho Mphego"
__license__ = "Python"

import time
import datetime
import os
import smtplib
from email.mime.text import MIMEText

#-----------------------Data Logger-----------------
f=open('/home/pi/Logs/DoorBell_Data_Log.txt','a')
now = datetime.datetime.now()
timestamp = now.strftime("%H:%M on %Y/%m/%d")
outstring1 = " Someone was at the door at " + str(timestamp) 
outstring2 = "\n********************************************* \n "
outstring = outstring1 + outstring2
f.write(outstring)
f.close()

# -----------------------Email Notifier----------------------
# Replace with your details.
USERNAME = "*******@gmail.com"
PASSWORD = "*********"
MAILTO  = "******@gmail.com"

if os.system("ping -c 1 www.google.com >> /dev/null 2&>1") == 0 :
	print "Sending Email Notification"
	msg = MIMEText('Someone is ringing the doorbell! \nGo Check!')
	msg['Subject'] = 'Doorbell notification!'
	msg['From'] = USERNAME
	msg['To'] = MAILTO

	server = smtplib.SMTP('smtp.gmail.com:587')
	server.ehlo_or_helo_if_needed()
	server.starttls()
	server.ehlo_or_helo_if_needed()
	server.login(USERNAME,PASSWORD)
	server.sendmail(USERNAME, MAILTO, msg.as_string())
	server.quit()
else:
	print "Unable to connect to Internet."

To have this run upon booting, we need to edit /etc/rc.local (as root since this is the owner).

sudo nano /etc/rc.local

At the bottom, just above exit 0 we’ll add a call to our script.

python /home/pi/Scripts/Smart_DoorBell/WaitDoorbell.py