David Meyers, Jared Santinelli, Phillip Robinson, Nazar Trilisky Georgia Institute of Technology School of Electrical and Computer Engineering October 23, 2008

 Goal: Prototype of an RFID-based access control system featuring adaptive lighting  Target Customer: Builders and developers of Multiple Dwelling Units (MDUs)  Motivation: Increase security and convenience while saving money  ~44% reduction in electricity  Target Prototype Cost: < $500  Actual Cost: $688.90

 Basic Layout  Red- “Entrance/Exit Module”  Green – “Room Module”

ObjectiveImplementation Automated entry/exit and identification Phidget RFID readers triggering entry and exit modules Occupant trackingProvide and update a log file and GUI Hallway light automation entry/exit Entry lighting controlled by eBox. Exit lighting controlled by timing circuit Need based foyer lightingPhotovoltaic switch to determine natural light conditions Electric door strikes for securityFail secure mode

22.5 in 39.5 in 39 in

Phidget RFID Reader (USB)  EM4102 Passive 125 kHz (Read Only)  Min Distance Between Readers: 1 m ▪Actual: in  Read Range ▪Vertical: 0.5 in to 4 in ▪Lateral: 0.5 in to 2 in 6.8 cm 8.1 cm

 eBox-2300  Available Interfaces  3 USB ports – For RFID Reader Communication  1 RS-232 port – For Microcontroller Communication ▪Straight through serial cable - TxD Pin #3  1 Ethernet  1 Monitor Connection  OS/Application languages  Windows CE 6.0  C# - Modified sample code

Main door entering. Valid? Waiting for RFID tags to scan Room door entering. Valid? Main door exiting. Relock Open / Turn On Sleep Thread 1 Thread 2 Close/ Turn Off Yes No

 CY8C PXI  24 Digital General Purpose I/O Pins  Maximum 80 mA combined I OH budget  V OH = V dd – 1 V = 4 V Min.  V OL =.75 V Max.

 Door Strike (SD-995C)  Triggered with 7.3 V differential  Fail-safe or Fail-secure modes  12 V Relays  Operate at % of specification voltage  DP-DT increases scalability  Photovoltaic Switch  Three Position Switch

Motion Detector Op Amp Circuit RC Timer Circuit Isolation Op Amp Circuit To Transistors 100uF capacitor and 270kΩ resistor determine timing characteristic Created -12 VDC using 555 timer

ProblemsSolutions Grounding IssuesRe-solder connections to circuit board and replace motion detector Unregulated 5V power sourceExternal 5V power supply C# coding restrictions (.NET compact framework) Adapted algorithms to use available libraries Pin 17 not functionalOther available pins Relay turn-off delaysComponents with higher tolerances Back EMF through transistorAddition of Snubber circuit

Test 1: Invalid Tag Hallway 1 2 Room Door Main Door Main Door Remains Locked Test 2: Valid Tag Room 1 Main Door Unlocked Main Door Locks Lights On Room Door Unlocks Light On Test 3: Valid Tag Room 2 Lights On

ItemExpectedActual Prototype Cost$451.97$ Additional Room Modules Cost $155.41$ Target Price of 50-Unit Building $38,600.00$43, Year Profit – 490 Units sold $1,090,119.00$1,008,498.26

 Alternative communication between readers and ebox  Ethernet, Wireless  Integration of additional systems  Security, AV Equipment  Regulated DC created from AC power  Integration of circuit components into a single DIP  Processing power required for expanded system