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Westminster Christian FellowshipBuzzcard Access Control System
Benjamin DavisNathan FiresheetsMark Whitmer
May 3, 2010
School of Electrical and Computer EngineeringGeorgia Institute of Technology
Project Overview
•Upgraded existing WCF access control system to include RFID support and a web interface, and comply with life safety codes
•Cost $850 to control Dining Room door
Design ObjectivesTask Accomplished?
Add RFID card readers Yes
Retain existing magnetic stripe card reader Yes
Upgrade door hardware to meet code Yes
Implement secure web administration interface Yes
Maintain secure access log offsite Yes
New System (Interior)
Installed Electric Strike Lock:
Electric Strike Mounts Electric Strike Mounts HereHerePanic Bar Mounts HerePanic Bar Mounts Here
Proposed Crash Bar & Strike:
New System (Exterior)
RFID Card RFID Card ReaderReaderMounts HereMounts HereDoor Pull Door Pull Handle Mounts Handle Mounts HereHere
Proposed RFID Reader & Pull Handle:
Existing Existing Magnetic Stripe Magnetic Stripe Card ReaderCard Reader
Installed Pull Handle and RFID Reader:
Control System Functional Diagram
The Web
Administrator
eBox Single Board Computer(Authorized Card Database)
PIC Microcontroller Board(Door Hardware Electrical Interface)
Optical IsolationReaders
Strike
Solid State Relay
SBC Software Functional Diagram
MySQLDatabase
Web Server
The Web
Serial BridgeProcess
To PIC
RS-232
ODBC ODBC
Web Interface Functionality•Administrators:
▫User management – create, remove, change▫Card authorization – add and remove cards from
users▫Log review▫Lock/unlock event scheduling
•Other user privileges (assignable to individual users)▫Change own password for web interface▫Building access via web (iPhone, laptop)▫Lock/unlock doors (dogging/“double-tap”)
Actual Design CostComponent Cost
PIC microcontroller $5
eBox single board computer (SBC)
$200
RFID Reader $25
Electric strike lock $355
Panic bar $110
Misc. Hardware Components $100
Misc. Electronic Components $55
Labor $0
Total Cost $850
Proposed Cost -$800
Over Budget $50
Current Progress
•Crash bar, surface-mount strike, RFID readers installed and fully operational
•PIC board receives card info from magnetic stripe and RFID readers and outputs to SBC
•SBC running appropriate software•Web interface user management and door
control complete•SBC outputs commands to PIC board,
which locks and unlocks electric strike
Acceptance TestingTest Proposed Measured
False negative card scans <3% <1%
False positive card scans 0% 0%
Unauthorized web access 0% 0%
Web interface door open <5 seconds <2 seconds
Card reader door open <5 seconds <2 seconds
Activation of credentials effective 100% 100%
Deactivation of credentials effective 100% 100%
System Transition Plan
•Existing system still fully operational and connected to magnetic card reader
•New system connected to RFID reader•Add users to new database•Take existing system offline, remove
existing hardware from system enclosure•Install new hardware in system enclosure•Connect magnetic card reader to new
system•Bring new system online
Schedule
•Project demonstration – May 3•Transition from old system to new – May 6•New system fully operational – May 7