This document describes a Bluetooth controlled security lock system built with an Arduino UNO, servo motor, Bluetooth module, and mechanical lock. The system allows a door lock to be unlocked remotely through Bluetooth connectivity to a smart device. It works by activating the servo motor via program instructions from the connected device, which causes the motor to rotate and pull a string attached to the mechanical lock to open it. The system provides a cheap, compact, and easy to program solution for remote security access with advantages like precise control and low power usage.

1. Content:-
●Introduction
●Components Description:- Arduino UNO, Servo
Motor, Bluetooth module
●Block Diagram
●Circuit Diagram
● Working
●Advantages & Disadvantages
●Future Extensions
●References

2. BLUETOOTH CONTROLLED
SECURITY LOCK SYSTEM
Made by:- Mayank Dubey

3. Introduction
●The project is made using Arduino UNO
Programmer.
●Programming is done using Arduino
software in modified embedded C language.
●Instructions are provided through Bluetooth
connectivity with smart devices.
●Door lock is unlocked using servo motor
connected to mechanical lock.

4. Component Description
●Arduino UNO
●Servo Motor
●Bluetooth Module
●Mechanical Lock

5. ARDUINO UNO
●This is programming board which
is universally used for Embedded
system project programming.
●It has 6 analog pins and 13
digital pins. Out of these digital
pins 6 pins are PWM inputs.
●The programming is done under
arduino software .
●The programme is Imported in
any of the IC s among this Atmega
328, Atmega 168 etc. according to
memory requirements by using
this board.

6. Servo motor
●Servo motors are ordinary geared
dc motors equipped with servo
mechanism for precise control of
angular position.
●It is 3 pin motor first is GND, second
is +5v dc and last is controller pin
used for designing motion of motor.
●It can be used to push or pull more
and more weight according to its
design. (high torque)
●These are generally use to design
robotics arms, rotatory motion joints
etc.

7. Bluetooth Module
● HC-05 module is an easy to
use Bluetooth SPP (Serial Port
Protocol) module, designed for
transparent wireless serial
connection setup.
●It has 6 pins out of which
commonly 4 pins are used; VCC,
GND, TX & RX.
●It has low Power Operation (1.8
to 3.6V I/O)
● It has UART interface with
programmable baud rate and
integrated antenna.

8. Block Diagram
Aurdino UNO
Servo Motor
LED light
Door lockPower supply
Bluetooth
Module

9. Circuit Diagram

10. Working
This Bluetooth controlled security system is designed in
such a way that one can access the door lock smartly
through the Bluetooth connectivity to the device. It can
also be accessed through wearable smart devices , with a
connection key for wireless communication between
smart device and the circuit.
This unlocking of security lock is done in steps given
below :
●Step1- As we connect the Bluetooth to the device, and
give instructions, program of servo motor gets activated.
●Step2- On activation of program servo motor starts
rotating according to the programmed angular rotations.
●Step3- As the motor head rotates, the security lock
which is connected with motor head through a string
gets pulled and lock opens.

11. Advantages
●Cheap, compact and feasible.
●Easy to programme and use with a single board.
●Precise control of angular rotation with servo mechanism.
●Easily mountable on small areas as it has compact design and
can be operated by small voltage. (5v - 9v).
●It can be extended further with the Password protection, Wi-Fi
or Ethernet connectivity.
●Low power consumption.
●Simple circuitry.
●Ease of deployment.
●Performance drops with long term usage.
●Moisture and heat can affect the performance of the
circuit and functionality of the system.
Disadvantages

12. Future Extensions
The security lock can be designed in
following manners:-
●Password protected security lock.
●RFID recognition.
●WIFI connection with server.
●Ethernet connection to the LAN.
●The most secure way- Biometric (Finger
Print) scanning.

13. References
● www.wikipedia.com
● www.instructables.com
● www.arduino.cc

14. THANK YOU