The OTP (One Time Password) based smart lock system utilizes an Arduino microcontroller along with a GSM (Global System for Mobile Communications) module to provide secure access control. This system allows users to unlock a door or access a secure location by sending a unique OTP via SMS (Short Message Service) from their registered mobile phone number. The Arduino, connected to the GSM module, verifies the received OTP and controls the locking mechanism accordingly. This project combines elements of IoT (Internet of Things) and home automation to create a convenient and secure solution for controlling access to physical spaces remotely.

1. NATIONAL INSTITUTE OF TECHNOLOGY, HAMIRPUR
OTP Based Smart Wireless Locking
System using Arduino
MAJOR PROJECT
Mento
r-
Dr. Mahesh Angira
(Assistant Professor, Department of Electronics And Communication)
Group
:-
Kethavath Srinu (20BEC110)
Rishab Kumar (20BEC093)
Suryansh (20BEC091)
Sohal Angiras (20DEC013)

2. CONTENTS
 ABSTRACT
 INTORDUCTION
 EXISTING METHOD
 PROPOSED METHOD
 COMPONENTS REQUIRED
 BLOCK DIAGRAM
 CIRCUIT DIAGRAM
 WORKING
 ADVANTAGE
 APPLICATION
 FUTURE SCOPE
 REFERNCE

3. Security is the most concern for anyone nowadays. As the most
natural way physical key is widely used to lock or unlock the door.
Different locks have different keys so it is burden to carry
,sometimes it may be stolen, misplaced and lost. The purpose of
the proposed system is to provide extra security that can be used in
homes and services. The proposed system is OTP based smart
wireless lock system using Arduino Uno. If the user generate
correct password OTP is sent on the user's device via GSM.If the
entered OTP is matched, then the system will be unlocked and
required task can be initiated. If either of the password or OTP is
wrong, then the access is denied. The proposed system provides
low-cost service and high security compared to the available
security systems.
ABSTRACT

4. • The main aim for providing locks for our home,
school, office etc. is for security of our lives and
property. With the advancement of technology and
increase the use of IOT automatic door lock system
has become a standard feature on many different types
of buildings and homes. And they are become popular
every day to develop electronic devices which provide
security.
• Home security has been a major issue because of the
increase in crime rate and everyday wants to take
proper action to prevent unauthorized user so we
propose an OTP based smart wireless lock system to
enhance the security of digital door- locks.
INTRODUCTION

5. The electronic wireless locking system is not
that safe because you might forget your
password, or it might be hacked by others,
while entering the password on your device.
A key-based locking system has now
become outdated because if your key is
lost or stolen, it creates a huge problem.
Carrying a large number of keys is a
burden and it can be stolen, misplaced or
lost. So, we can make a smart lock that
has the capability to remove all these
security problems.
EXISTING METHOD

6. Our goal is to design a solution for secure access
control that can replace physical keys for
accessing door. We propose a solution using OTP
based on smart phones providing wireless and
automatic unlocking via Bluetooth.
The design will allow easy implementation and
the device will work autonomously. This will
enhance the security and will eliminate the need
of carrying physical keys.
PROPOSED METHOD

7. COMPONENE
TS REQUIRED
 Arduino Uno
 Sim 800L GSM Module
 16X2 LCD Display
with I2C
 Jumper wires
 4X4 Keypad
 Servo motor
 LED
 9V Battery
 Buzzer
 5V Relay Module

8. BLOCK DIAGRAM
ARDUINO
UNO
Servo
motor
Power
supply
LED
Android
Mobile
GSM

10. WORKING
 Write a program for controlling a servo motor using an Arduino Uno,
including the servo library.
 Create an Android app using MIT App Inventor for locking and unlocking a
door remotely.
 Connect all necessary components, including the Arduino Uno, servo motor,
and power supply.
 Connect the components according to the circuit diagram.
 Open the MIT App Inventor app on your smartphone and enable GSM.
 Pair the smartphone with the GSM module. Once paired, confirm the
connection on the app.
 Send the device ID from the app to the Arduino Uno for verification.
 If the device ID matches, generate and send an OTP (One Time Password) to
the app.
 Display the OTP on the app for user verification.
 Upon successful verification, allow the user to control the servo motor to lock
or unlock the door.

11.  Library Incorporation and Variable Declaration:
• Incorporate the servo library for controlling servo motors.
• Declare variables for password generation, storing passwords, OTP,
and LED pin numbers.
 Setup for GSM Communication:
• Set up serial communication and define the Baud rate for Bluetooth.
• Configure the servo pin using servo attach (PWM_pin_number).
• Define pin mode as output for the LED.
 Loop for Bluetooth Data Handling:
• Create a loop to continuously check for incoming data from Bluetooth.
• Use an if() statement to check the device ID.
• If the device ID matches, call the otp () function to generate an OTP.
 OTP Generation and Verification:
• Implement the otp () function to generate an OTP.
• Create a check() function to verify the correctness of the OTP.
• If the OTP is correct, activate the servo to unlock the door.

12. Now, you can tap on the lock icon to unlock your Smart Lock.
If everything is ok then servo moves unlocking mechanism and
onboard LED of Arduino lights up indicating successful
unlock. We have used servo because of its high torque, and also
because we can control the angle of its movement that helps in
unlocking mechanism of lock.
CONTD..
Ø Development Using MIT App Inventor:
Ø Utilize MIT App Inventor, an online platform for
creating mobile applications.​
Ø Drag and drop components to design the application
interface.
Ø Use visual blocks language to program the application
behavior, such as sending device IDs and receiving
OTPs.

13. Pros
1.This smart lock can be easily used, it is highly safer because every time
you unlock it a new OTP will be generated.
2.This smart lock is not very costly so it can be availed by every
common person.
3.This smart lock can easily replace the electronic lock system in
future because it is highly secured.

14. • Security.
• Does not allow unknown people.
• Used for Anti-thefting strategy.
• Reduces the efficiency of the cost.
• Simple and easy implementations.
• Less power Consumptions.
FEATURES

15. • Smart phone can be lost.
• Bluetooth module maybe connected to another device.
LIMITATIONS

16. • Control of doors and windows shutters
• Faster operation and efficient
• Security System
• This project can be used in Industries,
Home, office and Shops
• It can be used for garage doors and gates.
• By using smart app, disabled or elderly
people can control lock as well as appliances
anywhere inside house.
APPLICATIONS

17. Many times, we forgot to carry the key of our home. Or sometimes we
come out of our home and door latch closes by mistake. In these cases, it is
really difficult to get inside the house. The main proposal for this project is
to increase the extra security to the people .This project will help in
keyless entry and at the same time will be more secure. This idea will
minimize the overall cost by the use of global system for mobile
communication.
CONCLUSION

18. • Extensions within the app cloud
• Alarm beeping instant alert
• Camera with built-in SD card
and fingerprint sensor
FUTURE
SCOPE

19. THANK YOU