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Electrical & Computer Engineering
Mid-Course Design Review
Anh-Vu HuynhTimothy LevernochSamuel Patterson
Christopher Ramonetti
Advisor: Professor Siqueira
RFID LocatorRFID Locator
2Electrical & Computer Engineering
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
3Electrical & Computer Engineering
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
4Electrical & Computer Engineering
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
5Electrical & Computer Engineering
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
6Electrical & Computer Engineering
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.
7Electrical & Computer Engineering
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
8Electrical & Computer Engineering
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
11Electrical & Computer Engineering
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
12Electrical & Computer Engineering
Future Tasks
Board Layout RF network
• Antenna Design
Verify Interfaces Create Power Sensing Software