Download Preliminary Design Review: PowerPoint Presentation

Preliminary Design Review
Advisor:
Professor Tessier
Team:
Lucas Root
Telin Kim
Brandon Thorpe
Michael Shusta
Department of Electrical & Computer Engineering
Outline
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Team and Roles
Statement of Problem
Existing Products and Our Solution
Basic Operation
Description of Main Components
 Requirements
 Implementation
• Design Challenges
• Deliverables for MDR
Department of Electrical & Computer Engineering
Team Organization
Project Lead:
Lucas Root
Software
Development:
Brandon Thorpe
Hardware
Development:
Mike Shusta
Department of Electrical & Computer Engineering
Software &
Web
Development:
Telin Kim
Problem Statement
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Two step buying process
Time spent in line
Shoppers must carry a form of currency
Theft
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Existing Products
• RF and microwave tags
• Ink tags
• Grocery store self-checkout
Department of Electrical & Computer Engineering
Existing Products
Why BlueTag Is Better:
• Combines security and purchase
• Products are not destroyed (consider ink)
• Self-checkouts can be fooled (weight
manipulation, price substitution)
Department of Electrical & Computer Engineering
Our Solution: BlueTag
Cell phone based payment system coupled with
Bluetooth un-lockable security tags
Credit Card
Purchase
Request Unlock
Tag
ID
Code
Locate Code
and
Unlock
Connect
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Item Info
Unlock Code
System Overview
Server
Locked
Item
Client
Internal
Database
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Inventory
Primary Design Components
• Bluetooth Security Tag
• Cell Phone Software
• Web Server
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Security Tag Requirements
Lock Mechanism
• Reusable
• Digitally controlled
Bluetooth Communication
• Low power
• On-board processing
• Digital I/O
Mechanism
Power Delivery
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Regulated voltage
Rechargeable and replaceable batteries
High transient current
Low power alert
Tag Identification
• Software: hardcoded unlock key
• Physical: tag ID on housing
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Power
Security Tag Implementation
Lock Mechanism
• Spring-loaded or bi-directional solenoid with IC relay
• DC motor, H-bridge, and gear and shaft
+V
+V
-V
-V
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Security Tag Implementation
Bluetooth Module: AIRcable SMD
• Wirelessly programmable micro-controller
• Runs applications in BASIC on the AIRcable OS
Power
• 50uA sleep, 11mA with connection, 25mA peek, max range peeks
up to 70mA at 5V
Memory
• 512 k EEPROM, 6 Mb internal flash
Communication
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Bluetooth Master/Slave connections
UART
8 pin digital I/O
Two analog input
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Cell Phone Software Requirements
User interface
• ID code entry
• Item display
Communication between phone and server
• Item Identification
• Unlock code request and receive
Communication between phone and tag
• Tag identification
• Unlock code transmit
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Cell Phone Software Implementation
Development:
• BlackBerry Plugin for Eclipse
• Extensive RIM API’s
Phone to Server Communication:
• TCP/IP based data transfer over WiFi
Phone to Tag Communication:
• Full access to Bluetooth Serial Port Profile on
BlackBerry
Department of Electrical & Computer Engineering
Cell phone Software: Program Flow
Tag
Cell Phone
Server
Start Program
User Type
Number
Tag Connect
No
Yes
Error?
Item Lookup and
Identification
No
Display Product
Info
Confirm
Purchase
Tag Unlock
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Purchase
Unlock Code
Lookup
Server Requirements
Manage client requests
• Unlock code and item information requests
Query a store’s inventory database
• Item lookup and identification
Complete purchase
• Third party payment system such as Google
Checkout™
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Server Implementation
• The server will be written using C# and the
Microsoft .NET 2.0 framework for rapid
development
• Interfacing with Google checkout will be done
through the GCheckout .NET assembly provided
by Google.
• The internal database will be implemented with
MySQL
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Design Challenges and Limitations
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Low power consumption
Hardware and software security
Mechanical integration
Small, fast, intuitive interface
Low cost
Department of Electrical & Computer Engineering
Deliverables for MDR
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Run simple routines on the AIRcable
Basic locking mechanism
Blackberry hello world
Database structure
Department of Electrical & Computer Engineering