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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 Target Cost: Prototype < $500 Provide automated entry/exit and identification using RFID Supply the ability to track occupants within a database Automate hallway lighting dependent upon user destination Turn on foyer light based on current natural lighting conditions Use electric door strikes to lock doors for security Basic Layout Red- “Entrance/Exit Module” Green – “Room Module” Phidget RFID Reader (USB) Board Dimensions: 6.8 x 8.1 cm EM4102 Passive Tags @ 125 kHz (Read Only) Read Range (depends on tag type) ▪ Vertical: 0.5 in to 4 in ▪ Lateral: 0.5 in to 2 in Min Distance Between Readers: 1 m Available +5 VDC and LED Output eBoxII Available Interfaces 3 USB ports – For RFID Reader Communication 1 RS-232 port – For Microcontroller Communication 1 Ethernet 1 Monitor Connection PS/2 Mouse/Keyboard Connection OS/Application languages Windows CE 6.0 C/C#/C++/Java CY8C29466-24PXI 19 Digital General Purpose I/O Pins Maximum 80 mA combined IOH budget VOH = Vdd – 1 V = 4 V Min. VOL = .75 V Max. Interfaces eBox: RS-232 TxD Pin #3 Rx8 Serial Reader Circuit: I/O Pins wired to transistors Door Strike (SD-995C) Triggered with 7.3 V differential Fail-safe or Fail-secure modes Relays Operate at 80-100% of specification voltage DP-DT increases scalability Photovoltaic Switch kc7786 - Passive Infrared Sensor (PIR) module Lens angle: 60° vertical, 100° horizontal Created from +12 VDC using 555 timer C1 and R3 determine timing characteristic Problems Solutions Motion detector has very small output voltage Used operational amplifier to increase signal level Need to create -12 VDC supply from +12 VDC Used 555 timer LCD display on EVAL board not working Using LEDs for debug Receiving RS-232 input on Microcontroller In Progress: adjusting timer, voltages, and parameters of Rx8 module Errors when building OS solutions In Progress: working with lab for eBoxII TAs to troubleshoot Room Door Unlocks Light On 1 Test 1: Invalid Tag Test 2: Valid Tag Room 1 Test 3: Valid Tag Room 2 Room Door Hallway Lights On Lights On 2 Main Door Main Door Main Door Remains Unlocked Locks Locked Cost Analysis: Prototype Cost – Approx. $451.97 Target Price for 50-unit building - $38,600.00 Based on 490 units sold, 5 year profit - $1,090,119.00 Current Market: Non-Integrated Devices - ~11% cheaper, less flexible Best Buy ConnectedLife.Home - $15,000 for typical 3- bedroom family residence Complete Design and Theory Initial Component Testing Motion Detector/Timer Circuit In Progress eBox Software Testing (11/12/08) Circuit/Simulation Environment Construction (11/12/08) Microcontroller Software Testing (11/12/08) Planned System Integration and Testing (11/12/08 – 11/28/08) Ready for Demo and Presentation (11/28/08)