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

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Presentation on theme: "David Meyers, Jared Santinelli, Phillip Robinson, Nazar Trilisky Georgia Institute of Technology School of Electrical and Computer Engineering October."— Presentation transcript:

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

2  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

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

4 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

5 22.5 in 39.5 in 39 in

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8 Phidget RFID Reader (USB)  EM4102 Passive Tags @ 125 kHz (Read Only)  Min Distance Between Readers: 1 m ▪Actual: 18-24 in  Read Range ▪Vertical: 0.5 in to 4 in ▪Lateral: 0.5 in to 2 in 6.8 cm 8.1 cm

9  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

10 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

11  CY8C29466-24PXI  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.

12  Door Strike (SD-995C)  Triggered with 7.3 V differential  Fail-safe or Fail-secure modes  12 V Relays  Operate at 80-100% of specification voltage  DP-DT increases scalability  Photovoltaic Switch  Three Position Switch

13 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

14 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

15 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

16 ItemExpectedActual Prototype Cost$451.97$688.90 Additional Room Modules Cost $155.41$275.34 Target Price of 50-Unit Building $38,600.00$43,270.00 5 Year Profit – 490 Units sold $1,090,119.00$1,008,498.26

17  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

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