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

Old System

•Single door•Magnetic stripe card reader•Magnetic lock•RS-232 terminal administration

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”)

Web Interface

Web Interface – User Management

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

Questions?

Demonstration