RFID MAPPING AND

LOCALIZATION

Critical Design Review

Millennium Engineering University of

Kansas

Top Action Items

n “Identify why you are doing this project.”n “Figure out some way to reduce costs.”n “Indicate how everything will be connected.”n “Compile a complete schematic of the system.”n “Plan out how the packaging is going to be done.”

Millennium Engineering University of

Kansas

Action Item:

“Identify why you are doing this project.”

Millennium Engineering University of

Kansas

Backgroundn RFID systems are used for tracking Wal-Mart inventory,

identifying lost animals, preventing shoplifting, and even tracking patients’ medicine intake.

n Honeywell’s expectations:n To be used as a locator of parts—not inventory.n Multi-path can be ignored for now.n All parts, boards and documentation will be turned over to them at the end.

n Any excess monetary needs will be provided by them.

Millennium Engineering University of

Kansas

Action Item:

“Figure out some way to reduce costs.”

Millennium Engineering University of

Kansas

Cost ChangesPDR:

$26.56 (saving $38.44)

Revised:

1 @ $123.75 (saving $421.25) 3 @ $54.99 (saving $15.03) 5 for $201.75 (saving $78.25) $1,030.25 (saving $664.75)

Total Savings: $1,217.72

Millennium Engineering University of

Kansas

Cost BreakdownPurchased by HoneywellPart Connections P/N Vendor Cost Units TotalUHF Reader RP TNC-M, USB, Ethernet R420 Impinj $1,030.25 1 $1,030.25Connection Converter RP TNC-F, SMA-F 242105RP Digikey $13.66 3 $40.98Coax Cables, 10" SMA-M CCSMA-MM-086-12 Digikey $11.94 4 $47.76Coax Cables, 8" SMA-M CCSMA-MM-086-8 Digikey $10.68 1 $10.68Coax Cables, 6" SMA-M CCSMA-MM-086-6 Digikey $12.01 1 $12.01Coax Cables, 3" SMA-M CCSMA-MM-086-3 Digikey $8.39 5 $41.95

$1,183.63

Purchased by EECS Dept.Part Connections P/N Vendor Cost Units TotalAntenna RX: SMA-M; TX: SMA-F HG908P-SM L-Com $54.99 3 $164.972 Way-0° Power Splitter/Divider SMA-F ZX10-2-12+ Mini Circuits $29.95 3 $89.852 Way-180° Power Splitter/Divider SMA-F ZFSCJ-2-4+ Mini Circuits $69.95 1 $69.954 Way-0° Power Splitter/Divider SMA-F ZX10-4-11+ Mini Circuits $41.95 1 $41.95Arduino Uno USB A000066 Digikey $26.56 1 $26.56RF Switch SMA-F, Pins SKY13385-460LF Digikey $123.75 1 $123.75

$517.03

Millennium Engineering University of

Kansas

Action Item:

“Indicate how everything will be connected.”

Millennium Engineering University of

Kansas

Connectionsn PC to UHF Reader

n Ethernet to Serial or Ethernet to Ethernet (from Matt or Matt)

n PC to ArduinoUnon USB to mini-USB (comes with Arduino)

n UHF Reader to Sum/Delta Networkn RP-TNC to SMA adapter to SMA (coax from Prof. Allen)

n Sum/Delta to Switching Network and Antennasn SMA to SMA (coax from Prof. Allen)

n ArduinoUno to RF Switch Controln Wire from board to banana clip or soldered directly to header

coming out of switch

Millennium Engineering University of

Kansas

Action Item:

“Compile a complete schematic of the system.”

Millennium Engineering University of

Kansas

SchematicZX0-2-12+

HG908P-SM

OUT1

IN

OUT3

OUT2V3

V2

V1

VDD

SKY13385-460LF0 180

S ZFSCJ-2-4+ZX10-4-11+

GND0 HG908P-SM

242105RP

C3C2C1

ArduinoUnoA000066

Computer

**All connections will be made with SMA-MM coaxial cable, except the RX antennas (connected directly) and the switch control pins (soldered jumpers).

5V

R420

Impinj Speedway Revolution UHF Reader

0

0

0

000

0

00S

0

S

S

S

ZX0-2-12+

ZX0-2-12+

HG908P-SM

242105RP 242105RP

Computer (data) Computer (pwr)

Millennium Engineering University of

Kansas

Schematic(w/ Connections)

HG908P-SM

ZX0-2-12+

OUT1

IN

OUT3

OUT2

V1

V3

V2

VDD

SKY13385-460LF180S

0ZX10-4-11+

ZFSCJ-2-4+GND

0 HG908P-SM

242105RP

C1 C3C2

ArduinoUnoA000066

Computer

Computer (data) Computer (pwr)

Ethernet

USB

Serial

Mini-USB

EthernetEthernet

Pin Pin

Pin

Pin

Pin

Pin

Pin

Pin

SMA-F

SMA-M

SMA-F

SMA-M

SMA-FSMA-F

SMA-F

SMA-F

SMA-F SMA-F

SMA-F SMA-F

SMA-F

SMA-F

SMA-F

SMA-F

SMA-F SMA-F

SMA-F

SMA-F

SMA-F

RP TNC

SMA-F

RP TNCRP TNC

**All connections will be made with SMA-MM coaxial cable, except the RX antennas (connected directly) and the switch control pins (soldered jumpers).

SMA-FSMA-F

R420

Impinj Speedway Revolution UHF Reader

5V

SMA-F

0

0

0

00

0

0

0

0S

0S

S

HG908P-SM

S

ZX0-2-12+

ZX0-2-12+

242105RP 242105RP

Millennium Engineering University of

Kansas

Action Item:

“Plan out how the packaging is going to

be done.”

Millennium Engineering University of

Kansas

Packaging

n Non-conductive materialn As compact as possiblen Front panel: Antennasn Inside of box: power splitter,

sum/delta network, uhf reader, coax connections

n UHF reader connections will have to exit the box

18”

18”

18” Front

Millennium Engineering University of

Kansas

Design Changes since PDR

1. UHF Reader Selection2. Sum/Delta Network

3. Risk Factors

Millennium Engineering University of

Kansas

Impinj Speedway Revolution R420n Four monostatic RP-TNC antenna ports

n Device capable of interrogating RFID tags, and able to supply useful RSSI, phase, and dynamic power settings

n Chosen over ThingMagic’s M6 due to active development community and ease of use of the SDK.

n Software interface: Octane API/LLRP

n Received a 35% college discount, making the cost $1,585*0.65 = $1,030.25

Millennium Engineering University of

Kansas

Schematic

Source: http://rfid.net/product-listing/reviews/128-the-impinj-indy-r1000-reader-chip

Impinj Indy R1000 Reader Chip

Millennium Engineering University of

Kansas

Steering and +/Δ Networkn Only one receive antenna will be steered, eliminating the

need for 3 of the 4 evaluation boardsn Power splitters to be used for the sum/delta network instead

of a hybrid coupler

0° 0° 0° 0°

0° 0°

0° 0° 0° 0°

0° 180°

DeltaSum

Millennium Engineering University of

Kansas

Trace Length Calculationn Calculated using the following formula:

n Definitions & assumptions:

•

•

n Difference in trace lengths:

Millennium Engineering University of

Kansas

Risk Analysisn Risk: Honeywell is unable to fabricate the steering network

PCB in timen Mitigation: We are buying a switch and will use different lengths

of coax to steer the antennan Risk: Problems with multipath and obstructions lead to

inconsistent results during testingn Mitigation: Perform experiments in an open space outside

n Risk: Issues getting the phase network to function properly.n Mitigation: Rely on functionality of UHF reader alone to

accomplish basic localization.n Risk: Honeywell can’t provide the necessary coax cables

n Mitigation: Excess from Nichols Hall will be used, courtesy of Prof. Allen

Millennium Engineering University of

Kansas

MilestonesnMilestone #1 (by April 6th):Successfully read an RFID tag using the reader as it normally functions (that is, without the steering network). This we will do by connect the antennas directly to the reader and following its testing documentation.

nMilestone #2 (by April 20th):Successfully steer the receiving beam. This includes the switching networks, Arduino, and software. The steering can be tested theoretically (using network analyzers) or physically (using a antenna pattern cross-section).