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1. 16x2 Lcd display. 2. Button panel to enter password. 3. Image notification through email on security breech. 4. Password to auto turn 'OFF' lights inside the house. 5. OTP (one time password) for guest. 6. Motor operated automatic door.

Project State

Public Project


Software Licence: Creative Commons Attribution Share-Alike license
Hardware Licence: Creative Commons Attribution Share-Alike license

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This project is a part of Smart Home Project, Click here to see overview and dependencies

Watch Video Here


Begining with the overview of the smart lock project given below :

The smart lock project contains a 16x2 Lcd displayArduino Uno micro-controller boardMatrix switch panel, a SIM900 GSM module, Raspberry pi 3 board and Basler Dart camera.

Note: Connectivity between controllers are done to make efficient system and reduce the number of micro-controllers as more number of pins were needed in lock and very less number of I/O pins were needed in window/cutrain system.

Features of the project :

1. Smart password locking system.

2. One time password for guests.

3. Email notification on security breech.

4. Turn 'OFF' lights inside the house using password.

The Code :

LiquidCrystal lcd(12, 11, 4, 5, 6, 7); // LCD connected on pins 12, 11, 4, 5, 6, 7
SoftwareSerial mySerial(9, 10);        // pin 6 as RX and Pin 10 as TX
int countwrong=0; // counter for counting the number of times the password was wrong
char  otp [4]= {' ',' ',' ',' '}; // variable to store otp
char pass [4]; // variable to store entered password
char password [4]= {'1','2','3','4'}; // stored password
char light [4]= {'4','4','4','4'}; // stored password for lights OFF
const byte ROWS = 4; //four rows of keypad
const byte COLS = 3; //three columns of keypad
char keys[ROWS][COLS] = {
byte rowPins[ROWS] = {A0, A1, 8, A5}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {A2, A3, A4}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup() {
 mySerial.begin(9600);   // Setting the baud rate of GSM Module  
 Serial.begin(9600);    // Setting the baud rate of ardunio to window controller
 lcd.begin(16, 2);
 pinMode ( 13, OUTPUT); // Status LED
 pinMode ( 2, OUTPUT);  // pin for raspberry pi to send email.

void loop() 

lcd.setCursor(0, 1);
lcd.print("                       ");
lcd.setCursor(0, 0);
lcd.print(" Shanque's Home  ");  //Prints message on the screen

if ( countwrong == 4){   // checks if the password was wrong for more than 4 times 
digitalWrite (2, HIGH);
digitalWrite (13, HIGH);
digitalWrite (2, LOW);
digitalWrite (13, LOW);
digitalWrite (13, HIGH);
digitalWrite (13, LOW);  // blinks led and set the pin 2 high for raspberry pi
  if (mySerial.available()>0)   // For GSM module
 { char ch =;
   if ( ch == '#')  // check for # and then store the password accordinly
for (int i=0;i<4;i++)
     otp[i] =; // Store OTP 

digitalWrite(13, HIGH); // sets status led 'ON' when OTP received
lcd.setCursor(0, 0);
lcd.print("  otp received  ");
SendMessage(); // Sends message to the phone on OTP received
char key = keypad.getKey();  // keypad input
if (key != NO_KEY){
  lcd.setCursor(0, 0);
   lcd.print(" Enter Password     ");
  for (int i =0;i<4;i++)
  { key = keypad.getKey();
   while (key == NO_KEY) 
     key = keypad.getKey();
   lcd.setCursor(i, 1);
  int count = 0; // local counters for password check
  int count2 = 0;
  int count3 = 0;
  for (int i =0;i<4;i++)
  { if ( pass[i] == password[i]) // check for password equal to stored password
   if ( pass[i] == otp[i]) // check for password equal to stored otp
  if ( pass[i] == light [i]) // check for password equal to stored password for lights
  if(count == 4)
  { lcd.setCursor(0, 0);
   lcd.print("   door open   ");
   Serial.write('Y'); // sends Y to window controller to open gates
  else if (count3 == 4)
  { lcd.setCursor(0, 0);
   lcd.print("    Lights OFF    ");
   Serial.write('Z');   // sends Z to switch board controller to switch off lights
    countwrong=0; // sets counter to zero
  else if (count2 == 4) // if password is equal to otp, opens gates and deletes OTP
  { lcd.setCursor(0, 0); 
  otp [0] = ' ';
  otp [1] = ' ';
  otp [2] = ' ';
  otp [3] = ' ';
   lcd.print("   door open     ");
    digitalWrite (13, LOW);
    Serial.write('Y'); // sends Y to window controller to open gates
    lcd.setCursor(0, 0);
    lcd.print("     otp used     ");
    SendMessage1(); // sends the message that guests arrived
   { lcd.setCursor(0, 0);
   lcd.print("  wrong password  ");
   countwrong++; // raise the password by one if the password was wrong
 void SendMessage() // send message when otp is received
  mySerial.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);  // Delay of 1000 milli seconds or 1 second
  // Replace x with mobile number
  mySerial.println("OTP Received");// The SMS text you want to send
  delay(100); mySerial.println((char)26);// ASCII code of CTRL+Z
 void SendMessage1() // send message when otp is used.
  mySerial.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);  // Delay of 1000 milli seconds or 1 second
  // Replace x with mobile number
  mySerial.println("Guest arrived");// The SMS text you want to send
  delay(100); mySerial.println((char)26);// ASCII code of CTRL+Z


1. Smart password locking system : 

The lock contains a matrix keypad which is used to input password which thereby is compared with the stored password and unlocks the door if the password is correct. If the PASSWORD is incorrect, then it increases the counter which is used to note the number of incorrect attempts.

For the keypad board to work, a keypad library is needed to be installed in the arduino IDE which can be downloaded here

The input from the keypad is stored in the character array of size 4, i.e. the password used here is of four digits only.

Whenever the password is correct, the lock controller send a message to window/curtain controller which in turn operates the geared DC motor using L 293 ( the motor driver ).


2. One time password for guests:

This features allows guests to enter inside the house when you are not present to attend them or late for some reasons, thereby reducing extra efforts.

To initiate OTP, we need to send a four digit password from our mobile phone to the number in the GSM module. The OTP begins with '#', example : #4444, #1234, #5665 etc. When the Lock controller receives the password, It sends a message to the registered number "OTP received" and also switches 'ON' the LED connected to Pin 13 of the controller.

When the quest use the OTP provided, It gets deleted and also switches 'OFF' the LED connected to Pin 13 of the controller and sends the message to the registered mobile number "Guest Arrived".


3. Image notification through email on security breech :

For this feature, I have used Raspberry pi 3 board with Basler Dart Camera and wifi connection for internet.


1. Setting Up Your Raspberry Pi With Raspbian : 

First you need to install Raspbian on your micro sd card that you will be using in your Raspberry Pi.

You can download the latest image of Raspbian from Raspberry Pi website at:

You will need to use an image writing tool to install the image on your SD card. You can find the steps to do that at:

2. Install OpenCV and Required Libraries :

There are lots of methods to do this. But I would prefer using the simplest method that is available in OpenCV website at

3. Installation of Basler Dart Camera application Pylon :

Download pylon 5.0.11 Camera Software Suite Linux ARM 32 bit hardfloat from Here , unzip and follow the iunstructions mentioned in text file inside.

4. Python Code :

Use the attached Python code after editing the following lines

gmail_user = "" #Sender email address

Enter your email address in the above line using which the Photo captured will be sent

gmail_pwd = "xxxx" #Sender email password

Enter the password of the sender email address.

to = "" #Receiver email address

Enter the email address to which the email with the picture captured will be sent...


import RPi.GPIO as GPIO
import time
import numpy as np

import pypylon.pylon as py

import cv2
from datetime import datetime
import os
import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email import Encoders
gmail_user = "" #Sender email address
gmail_pwd = "xxxx" #Sender email password
to = "" #Receiver email address
subject = "Security Breach"
text = "Somebody is trying wrong passwords at the door. See the attached picture."

sensor = 4

GPIO.setup(sensor, GPIO.IN, GPIO.PUD_DOWN)

previous_state = False
current_state = False

icam = py.InstantCamera(py.TlFactory.GetInstance().CreateFirstDevice())
icam.PixelFormat = "RGB8"

while True:
    previous_state = current_state
    current_state = GPIO.input(sensor)

    if current_state != previous_state:
        new_state = "HIGH" if current_state else "LOW"
        print("GPIO pin %s is %s" % (sensor, new_state))
	if current_state:
        img = icam.GrabOne(4000)
		img = img.Array
		print "Saving Photo"
		picname ="%y-%m-%d-%H-%M")
		picname = picname+'.jpg'
        cv2.imwrite(picname, img)
		print "Sending email"
		attach = picname
		msg = MIMEMultipart()

		msg['From'] = gmail_user
		msg['To'] = to
		msg['Subject'] = subject


		part = MIMEBase('application', 'octet-stream')
		part.set_payload(open(attach, 'rb').read())
   		'attachment; filename="%s"' % os.path.basename(attach))

		mailServer = smtplib.SMTP("", 587)
		mailServer.login(gmail_user, gmail_pwd)
		mailServer.sendmail(gmail_user, to, msg.as_string())
		# Should be mailServer.quit(), but that crashes...
		print "Email Sent"

5. Final Setup :

Now connect the Basler Dart camera and pin from arduino to the Raspberry Pi.

Connect the output from arduino to GPIO pin 4 and also connect ground from arduino to ground of raspberry pi.

Now you run the python code with sudo to check the setup. Whenever somebody enters password wrong more than 5 times, an image is captured and email is set the to email address you entered as the receivers email address.

6. Raspberry Pi Auto Login and Auto Start and Run the Python Code :

To auto run the python code at start up just by powering up the raspberry pi use the following steps.

Auto Login:

In Terminal:

sudo nano /etc/inittab

Scroll down to:

1:2345:respawn:/sbin/getty 115200 tty1

and change to

#1:2345:respawn:/sbin/getty 115200 tty1

Under that line add:

1:2345:respawn:/bin/login -f pi tty1 /dev/tty1 2>&1

Ctrl+X to exit, Y to save followed by enter twice

Auto run the python code

sudo nano /etc/rc.local

Scroll to the bottom and add the following above exit 0:

sudo python /directory/

Press Ctrl+X to exit, Y to save followed by Enter twice.

If you face any issues in the steps, look at

Now reboot the system and you will see that the python code has started.


4. Turn 'OFF' lights inside the house using password : 

This feature allows you to switch 'OFF' the lights inside the house when you forgot to switch them 'OFF' so, you don't need to go inside the house to switch them 'OFF'. Thereby reducing extra efforts.

This is how it works :

When the password entered by you matches the password for the lights, say '4444' here, the controller sends a signal to Window/Curtain controller, which in turn sends the signal to switch board controller and switches all the lights 'OFF'.

Name Article number Link Quantity Unit Price
GSM module 1 15.99 $
ARDUINO UNO 1 27.89 $
Raspberry Pi 3 1 34.47 $
L 293d ( motor driver ) 1 5.93 $
Geared DC Motor 1 4.00 $
16 x 2 LCD Display 1 7.99 $
Keypad 1 2.00 $
Total 98.27 $


mhebbel report abuse
The camera code doesn't appear to be uploaded?
Himanshu_S report abuse __Pencil edited
yes i saw that today, by mistake i have uploaded the wrong python code. I don't have the machine with me as i am not in the city. I will upload the right code and get back to you soon. Thanks for the review comment...........
Himanshu_S report abuse