Electrical & Computer Engineering

Mid-Course Design Review

Anh-Vu HuynhTimothy LevernochSamuel Patterson

Christopher Ramonetti

Advisor: Professor Siqueira

RFID LocatorRFID Locator

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Background & Motivation

The idea that “smaller is better”• Cell phones• MP3 players

The loss of smaller-sized objects has always been a concern.

Already existing solutions• None of them are economical

RFID Locator• Proliferation of cell phones and PDA’s• Inexpensive to implement

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Existing Technology

Non-RF• Response to whistle or clap

• False alarms• Short distances

• Requires batteries for tags• Tag only a few items per locator

RF• Expensive • Require base station and many readers

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Why is this Hard/Interesting?

Portability• Small enough to carry around

Power• Sensor has a long battery life

• Limit the amount of transmissions and transmission size• Measure response power

• Tags do not require batteries Transmission collisions Cost

• Under-cut current solutions

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MDR Specifications

Refined specifications and design schematic for the RFID "black box"

Specific model numbers for major components of "black box"

Model of tag with operating frequency Outline of software for Blackberry with flow chart Software prototype for Blackberry software

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Principles of Operation

RFID Locator interfaces with a Blackberry 7290 smartphone via USB port.

An object is associated with the tag’s ID through the Blackberry by the user.

Upon the user’s request, the RFID Locator will indicate the approximate location through an audible and visual signal.

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Block DiagramBlock Diagram

RF Front-end

EM4298RFID Reader IC

US

B C

ab

le

“RFID Reader”

RFID TagAir

Interface

USB Controller

Blackberry Smartphone

PIC18LF4220Microcontroll

er

User Input

USB Port

Keyboard

Power Meter& Audio Signal

Software

Legend

Information SignalControl Signal

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Hardware Design

RF

1 2 3 4 5

C2

22p

U24

EM4298

123456789

1011121314

2827262524232221201918171615

vsscsnrdnwenclka[0]a[1]a[2]a[3]d[0]d[1]d[2]d[3]vdd

vddrfon

tx_activetx

iq

NCtest_enn

intd[7]d[6]d[5]d[4]vss

0

0

RESET

PDIUSBD12

123456789

1011121314

2827262524232221201918171615

DATA0DATA1DATA2DATA3GNDDATA4DATA5DATA6DATA7ALECS_NSUSPENDCLKOUTINT_N

A0VOUT3.3

D+D-

VccXTAL2XTAL1GL_N

RESET_NEOT_N

DMACK_NDMREQ

WR_NRD_N

U2

Clock

1

7

14

8

N.C.

GND

Vcc

CLK

VCC

U17

ATMEGA32

123456789

1011121314151617181920

4039383736353433323130292827262524232221

PB0(XCK/T0)PB1(T1)PB2(INT2/AIN0)PB3(OC0/AIN1)PB4(SS)PB5(MOSI)PB6(MISO)PB7(SCK)RESETVCCGNDXTAL2XTAL1PD0(RXD)PD1(TXD)PD2(INT0)PD3(INT1)PD4(OC1B)PD5(OC1A)PD6(ICP1)

(ADC0)PA0(ADC1)PA1(ADC2)PA2(ADC3)PA3(ADC4)PA4(ADC5)PA5(ADC6)PA6(ADC7)PA7

AREFGND

AVCC(TOSC2)PC7(TOSC1)PC6

(TDI)PC5(TDO)PC4(TMS)PC3(TCK)PC2(SDA)PC1(SCL)PC0(OC2)PD7

VCC

R1

1k

U3

XTAL

1 2

C1

22p

D2

LED

VCC

VCC

0

0

0

USB Socket

Type A

1 2 3 4

Vcc

D- D+ GND

0

0

0

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Software Flow Chart

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Software Outline

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Hardware Design Expenses

Item Cost (Single) Cost (Bulk)

Atmega32 7.90 4.60

PDIUSBD12 3.49 1.94

Alien Gen2 Tag 0.46 0.22

EM4298 10.15 7.86Oscillators, Filters, and amplifiers for RF network

<20.00

USB-bus w/power supply and clock

19.99 N/A

Additional Passive Components

<2.00

Total

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Future Tasks

Board Layout RF network

• Antenna Design

Verify Interfaces Create Power Sensing Software

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QUESTIONS OR QUESTIONS OR COMMENTS?COMMENTS?