1. Wireless Anti-Theft Device
Team Members:
Gary Moore
David Moore
John Hannen
Faculty Advisor: Dr. Junghwan Kim
April 09, 2014

2. Table of Contents Motivation 3 Current Software Solutions 4
Definitions
Proposed Solution 8
Design Implementation 9
Hardware Design
Software Design
Future Work
Summary

3. Motivation
Smartphones are valuable and common; a good target for thieves.
Current security measures focus on recovery, but ineffective.
Cell Phones are now the most valuable thing one carries around with them. Source:

4. Current Software Solutions
Android Device Manager
If the app is unable to find the device, it will display the last location and time it was able to find it.
Find My Iphone
If the device has been turned off or the battery is dead, the map will display the last known location of the device.

5. DEFINITION: BLUETOOTH LE
Short-range communication protocol.
Broadcast only when exchanging data, hence power efficient.
Built into many smartphones.
Discussion Explanation of Terms BLUETOOTH LTE

6. DEFINITION: RSSI (Receiver Signal Strength Indicator)
Measures power contained in received radio (Bluetooth) signal.
Radio waves obey inverse-square law; can therefore be used to find distance.
Discussion Explain of Terms RSSI

7. DEFINITION: Low Dropout Regulators (LDOs)
Uses a PNP transistor to regulate voltage levels.
Small design though somewhat inefficient (around mV lost).
Found in most microchips to increase input voltage range

8. Proposed Solution
Design an alarm system utilizing the smartphone’s hardware and software. Smartphone has bluetooth built in, and using speakers for alarm.
Source: Samsung Belgium

9. Design Implementation

10. Microchip Design Non-Volatile Memory Accurate Sleep Timer
Low Operating Power

11. DC/DC Converter Design
High Efficiency Conversion Rate
Low Quiescent Power Lost in Bypass Mode

12. Software Design: Algorithm
Discussion of Solution design Bluetooth transmit/receive function and RSSI algorithm.

13. Software Design: Bluetooth Transaction Manager
Tracker device enters cycle:
- Wait for Request
- Ping
- Sleep

14. Software Design: Smartphone Application

15. Software Design: User Interface
Handles interactions between user and code.

16. Software Design: Bluetooth Communication
Converts RSSI data into a distance measure (the range)

17. Software Design: Alarm Management
Triggers alarm if calculated range is too large.

18. Future Work Automatic RSSI calibration Indoor vs. Outdoor mode
Power Savings
Build alarm into Anti-Theft Device

19. Summary We designed a solution to smart-phone theft.
Alerts to theft instead of aiding with recovery, as most other solutions do.
Does not modify smartphone hardware.
Small enough to carry around conveniently.
Results.