This document describes an OTP based smart wireless lock system using Arduino Uno that was presented by a group of students. The system uses Bluetooth to send a one-time password from a mobile device to an Arduino/servo motor-controlled lock. If the correct password and OTP are entered, the lock will open, providing secure access. It aims to improve security over traditional keys and enhance access control with automated unlocking using a smartphone app and Bluetooth connectivity.

1. ELECTRONICS AND COMMUNICATION ENGINEERING
“OTP BASED SMART WIRELESS LOCK
SYSTEM USING ARDUINO UNO”
PRESENTED BY
Ms. G. UJWALA (19471A04D8)
Ms. K. APARNA (19471A04F7)
Mr. S. KOTI REDDY (19471A04H0)
Mr. K. RAGHU (19471A04F8)
Mr. SK. SAMEER (19471A04H6)
GUIDE
Mr. B.SRINIVASA RAO
Asst. Prof, Dept of ECE
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BATCH NO:C4

2. CONTENTS
 ABSTRACT
 INTRODUCTION
 EXISTING METHOD
 PROPOSED METHOD
 COMPONENTS REQUIRED
 BLOCK DIAGRAM
 CIRCUIT DIAGRAM
 WORKING
 OUTPUT
 RESULT
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 ADVANTAGES
 APPLICATIONS
 FUTURE SCOPE
 REFERENCES

3. ABSTRACT
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 Bluetooth . 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.
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4. 4

5. INTRODUCTION
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 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.

6. EXISTING METHOD
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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.

7. PROPOSED METHOD
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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.

8. COMPONENETS REQUIRED
 Arduino Uno
 Bluetooth HC-05
 Jumper wires
 Servo motor
 LED
 Power bank
 USB type-B cable
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9. BLOCK DIAGRAM
ARDUINO
UNO
Bluetoothh
Android
Mobile
Power
Supply
Power
Supply
Servo
Motor
LED
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10. CIRCUIT DIAGRAM
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11. WORKING
First, we need to write a program for that we need to include the
library files . Here we include a servo library because of using the servo
motor . After writing the program let’s make Android APP i.e. the
MIT(Massachusetts Institute of Technology)app inventor. Which is used
for lock and unlock the door. Connect the components to Arduino uno and
all the components to power supply. Then we have connected all the
components.
Next, open the installed App, then turn on the Bluetooth of the
phone, tap on HC-05 module. On successful pairing, you will get a
‘connected’ message on the App. After that, tap on the key icon to send
device id to match. If the device id is matched, it will send an OTP to your
app that you can see in App text bar between Bluetooth and lock icon.
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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.
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CONTD..

13. OUTPUT
When mobile Bluetooth is
connected to HC05 module.
The figure shows that the door is
locked.
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14. The fig shows that the
OTP is received to OTP
app lock in our android
mobile.
The figure represents that
door opens when OTP is
matches.
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15. RESULT
Hardware circuit
The figure shows the
circuit of the OTP
based smart wireless
lock system using
Arduino uno.
The figure describes
that the opening and
closing the door by
the received OTP to
our mobile through
Bluetooth.
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16. ADVANTAGES
 It has more security.
 It does not allow unknown people.
 It is also used for anti-thefting strategy.
 It reduces the efficiency of the cost.
 Simple and easy implementations.
 It has less power Consumptions.
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17. LIMITATIONS
 Smart phone can be lost.
 Bluetooth module maybe connected to
another device.

18. APPLICATIONS
 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.
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19. CONCLUSION
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
Bluetooth.
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20. FUTURE SCOPE
The future scope for this is to extensions within the app
cloud also be viewing who is passing through the door by
adding the camera and sending stream directly to mobile
device.
This can also extends to , if someone is trying to break in the
door . Alarm will start beeping on mobile device .
The other extension for this project is to add a camera with
built-in SD card and also the finger print sensor
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21. REFERENCES
 ARDUINO UNO, http://www.arduino.cc/, ARDUINO UNO,
2017[Online] Available: http://www.arduino.cc/.
 OTP BASED SMART WIRELESS LOCK SYSTEM USING ARDUINO BY
Ashwini Kumar Singh ,feb 13 2019 , link: www.electronicsforu.com
 Elins Journal,Elins International Journal of Science Engineering &
Management(EIJSEM),Volume-2,Issue-1,Jan 2017.Secure
Electronic Lock Based On Bluetooth Based OTP System Available.
link : www.researchgate.net.
 Neelam Majgaonkar, Ruhina Hodekar, Priyanka Bandagale,
“Automatic Door Locking System”, International Journal of
Engineering Development and Research.
 A design of OTP BASED WIRELESS SMART LOCKING
SYSTEM BY MR.L.David William raj, M.Deepika, available
link is https://www.irjet.net/archives/V8/i4/Special_issue/IRJET-V8SI01
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22.  Manish Aggarwal SRM institute of science and technology ‘secure
electronic lock based on Bluetooth based OTP system’ link:
www.researchgate.net .
 https://www.irjet.net/archives/V8/i4/Special_issue/IRJET-V8SI01 JAMEER
BASHA IIT PROFESSOR(PUNE).
 Dr.Naveen IIT MADRAS ‘unlocking door by using OTP’.
 Srikanth SRM institute of technological sciences’OTP based embedded
system.
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