The document describes a project on a portable smart lock system that can be unlocked via SMS using GSM technology and a microcontroller. It outlines the system's methodology, technical specifications, and components like the Arduino board and GSM modem. The project concludes with successful implementation and future scope for enhancing security features with technologies like cameras and biometrics.

1. MINIPROJECT 2016
UNIVERSITY COLLEGE OF ENGINEERING, KARIAVATTOM
Department of Electronics and Communication
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2. smart lock
S6, ECE
Anwar C John
Ashik S R
Sachin Lal D
Suman S Raj

3. Project Description
Objective
• A portable lock which can also be
unlocked via SMS.
• The system automatically locks and
unlocks as soon as the lock receives a
predefined message from the user.
• Works both manually and
automatically.
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4. Procedure/Methodology
• The project intends to interface the microcontroller with the GSM
modem and lock/unlock the lock by sending the predefined
messages from the mobile to the controlling unit.
• The project uses the GSM technology and Embedded Systems to
design this application.
• The main objective of this project is to design a system that
continuously checks the messages if any, received from the user
mobile and change the status of the lock as per the message
received from the mobile.
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5. Block Diagram 7/25/2016smart lock
Microcontroller
Power supply
Motor
driver
Motor
Switch circuit
Clock & Reset
circuit
GSM Modem

6. •Microcontroller board based on the ATmega328 (datasheet).
•14 digital input/output pins (of which 6 can be used as PWM outputs)
•6 analog inputs
•16 MHz crystal oscillator
•USB connection
•The Uno differs from all preceding boards is that it does not use the
FTDI USB-to-serial driver chip. Instead,
it features the Atmega8U2 programmed as a USB-to-serial converter.
The GSM shield by Arduino is used to send/ receive messages and
make/receive calls just like a mobile phone by using a SIM card by
a network provider. We can do this by plugging the GSM shield into
the Arduino board and then plugging in a SIM card from an perator
that offers GPRS coverage. The shield employs the use of a radio
modem by SIMComm. We can communicate easily with the shield
using the AT commands. The GSM library contains many methods of
communication with the shield.
Circuit Diagram
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7. Motor Driver Circuit
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8. ATmega 328
Technical specification
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9. Microcontroller ATmega328
Operating Voltage 5V
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin 40 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB of which 0.5 KB used by bootloader
SRAM 2 KB
EEPROM 1 KB
Clock Speed 16 MHz
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10. 7/25/2016smart lock
digital pinsTX/RX
USB
interface
Power
Led
ICSP
Header
Reset
Button
ATmega328
Power pins Analog pins
External
power supply
I2C

11. GSM SHIELD
GSM SHIELD USING SIMCOMM
(SIM900A)
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12. GSM module
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13. SIM900A
Ultra compact and reliable wireless
module.
• GSM/GPRS 900/1800MHz performance
for voice, SMS, Data, and Fax.
• Small form factor and low power
consumption.
• 24mm x 24mm x 3 mm
• SIM900A can fit in for slim and
compact demand of design.
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Features:
Dual-Band 900/ 1800 MHz
GPRS multi-slot class 10/8
GPRS mobile station class B
Compliant to GSM phase 2/2+
• Class 4 (2 W @900 MHz)
• Class 1 (1 W @ 1800MHz)
Dimensions: 24*24*3 mm
Weight: 3.4g
Control via AT commands (GSM 07.07, 07.05 and SIMCOMM
enhanced AT Commands)
SIM application toolkit
Supply voltage range: 3.1- 4.8V
Low power consumption: 1.5mA(sleep mode)
Operation temperature: -40° C to +85°C

14. L293x Quadruple Half-H Drivers
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15. 7/25/2016smart lock

16. Geared DC motors
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17. Geared DC motors can be defined as an extension of DC motor
which already had its Insight details demystified here.
A geared DC Motor has a gear assembly attached to the motor.
The speed of motor is counted in terms of rotations of the
shaft per minute and is termed as RPM .The gear assembly helps
in increasing the torque and reducing the speed. Using the correct
combination of gears in a gear motor, its speed can be reduced to
any desirable figure.
DC Motor
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18. μA7800 SERIES
POSITIVE-VOLTAGE REGULATORS
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19. Description
This series of fixed-voltage integrated-circuit voltage regulators is designed for a wide range of applications.
These applications include on-card regulation for elimination of noise and distribution problems associated with
single-point regulation. Each of these regulators can deliver up to 1.5 A of output current. The internal
current-limiting and thermal-shutdown features of these regulators essentially make them immune to overload.
In addition to use as fixed-voltage regulators, these devices can be used with external components to obtain
adjustable output voltages and currents, and also can be used as the power-pass element in precision
regulators.
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20. Arduino PCB & components layout
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21. Project Summary

22. • At the end of our project we were successful in opening the lock even
without a key.
• The entire locking system can be made portable.
• We can use latest technologies like cameras and biometric sensors for
improving the security of the system.
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23. Future scope
•We can use latest technologies like cameras and biometric sensors for
improving the security of the system.
•The lock can be interfaced with a PC application and hence the SIM can also be
accessed through it.
•The key can be replaced by speech recognition.
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24. Conclusion
• The work was successful. It is evident that the use of mobile
phones with the right circuitry can be used to operate a locking
system.
• In this project we used an Arduino board. Arduino boards are cost
efficient and they are user friendly and hence can be easily
programmed.
• The entire locking system is portable.
• The future of this project is vast and endless.
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25. 7/25/2016smart lock
thank you
credits
team members
anwar c john
ashik s r
sachin lal d
suman s raj
Guidance
Ansil Shafi