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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).