Smart Lock Systems

1. By By P Prriyiyaannkkaa B Boottnnyy S Srrininaatthh

2. Need and Goal
Need
•Electronically controlled lock and key systems are
quite expensive
•Security has been a concern for main doors and
cars
Goal
•To provide a secure, low cost door lock system
•To provide a foolproof, easy to use, electronically
controlled security system

3. Lock Side Block Diagram

4. Key Side Block Diagram

5. Arduino Uno
• ATmega328P
microcontroller
• 16MHz Crystal Oscillator
• USB connection
• ATmega8U2 for USB-to-
TTL conversion
• 14 Digital I/O Pins
• Input Voltage: 7-12V
• Power Supply: USB or
External
Arduino Uno Front
Arduino Uno Rear

6. ATmega328P
• 8-bit Microcontroller
• 28-pin PDIP
• Up to 20MHz @ 1.8 - 5.5V
• Advanced RISC Architecture
• 32KB Flash Memory
• 2KB SRAM
• 1KB EEPROM

7. Xbee (ZigBee) Module
• Range up to 30m
• DSSS (Direct Sequence
Spread Spectrum)
• Frequency of operation – ISM
2.4GHz
• Uses serial UART interface to
communicate
XBee Module

8. IR Based Obstacle Detection
• Sensitivity up to 30 cm
(Adjustable)
• Operating Voltage – 5V
• Adjustable Range with
Potentiometer
• Logic Output – Binary
1/0 (5/0V)

9. Lock Mechanism
• Solenoid coil
• 7.5V, 2.5A
• Uses magnetic fields to
operate on the steel rod

10. Lock Side Schematic Diagram

11. Key Side Schematic Diagram

12. Advantages
• Better security compared to conventional
electronic locking systems
• Easy to use. Shut it and forget it!
• Low maintenance cost
• Cannot be easily duplicated
• Alarm system inbuilt
• NRE cost of the product is Rs. 500 ($10)

13. Limitation
• Continuous power consumption
• Easy to lock oneself out (if the key is left
inside)

14. Applications
• Homes security locking systems
• Banks, Police Stations and high security
buildings where single entry is permitted
• Automobile Lock System at low cost

15. Further Enhancements
• RFID (Radio Frequency Identification) usage
on the key side
• WiTricity – Wireless Electricity Transfer to
reduce power consumption
• Integration with portable devices like mobile
phones
• GPS for key tracking
• Biometrics and Touch Screen Interfaces