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SIMS: Smart Inventory Management System. Group 37 Masaki Negishi & Anthony Fai ECE 445 Senior Design April 27, 2005. Introduction. SIMS provides a cost effective solution for the management of inventory which leverages RFID technology.

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sims smart inventory management system

SIMS:Smart Inventory Management System

Group 37

Masaki Negishi & Anthony Fai

ECE 445 Senior Design

April 27, 2005

introduction
Introduction
  • SIMS provides a cost effective solution for the management of inventory which leverages RFID technology.
  • Combines an antenna array to a single RFID reader to map out an area for inventory detection
features
Features
  • PC serial interface
  • Compatible with RFID Readers and Antennas
  • Up to 8 outputs per unit
  • Expandable, modular design
system overview
System Overview
  • Hardware:
    • Power Supply, PC Interface Processing Unit, RF Switching Unit
    • TI HF RFID Reader, TI HF RFID Antenna, TI HF RFID Transponders
  • Software:
    • PC control for antenna switching
hardware overview in house manufactured
Hardware Overview (In House Manufactured)
  • Power Supply
    • Takes 6Vdc from AC/DC wall converter and converts to stable 5Vdc
  • PC Interface Processing Unit
    • PC communication with system
  • RF Switching Unit
    • Switching of RF signal from reader to selected antenna
pc interface processing unit
PC Interface Processing Unit
  • PIC Microprocessor
  • RS232 Serial Communication with PC
  • Sends output to RF Switching Unit
rf switching unit
RF Switching Unit
  • Takes in input from RFID reader
  • Four outputs per board (expandable)
  • Relay switching
pin diode switching unit eliminated
PIN Diode Switching Unit (Eliminated)
  • Employ PIN Diodes for Switching
  • Great performance for small peak to peak AC signal (low power)
  • Poor performance for large peak to peak AC signal (high power)
  • Introduce impedance mismatch
power supply main idea
Power Supply (Main Idea)
  • Supplies +5 Vdc and GND to switch and control units
  • Maximum current: 1A
  • More stable compared to 5V from the wall
power supply results

We always like to see measured data (especially with waveforms)!

Power Supply (Results)
  • Vmax: 5.023 V
  • Vmin: 4.975 V
  • Max. Ripple: 48.44mV
  • Freqnency: 95.057KHz
hardware overview outsourced
Hardware Overview (Outsourced)
  • TI RFID S6500 HF Reader
  • TI RFID HF Transponders
  • TI RFID HF 13.56 MHz Antenna

(RI-ANT-T01A)

ti rfid s6500 hf reader
TI RFID S6500 HF Reader
  • RFID Reader
    • Necessary to read and write to transponders
    • Can be connected to PC through RS232
    • Operating Frequency of 13.56 MHz (HF)
    • Output voltage of 48 V peak-to-peak
    • Power output of 4 W
ti rfid hf transponders
TI RFID HF Transponders
  • Transponders
    • Receives 13.56MHz of the signal from the reader, and sends back a signal to the reader
    • Consists of a loop antenna and a chip microprocessor
factors influencing communication with tags
Factors Influencing Communication with Tags
  • Orientation of tag with respect to antenna
  • Environment around tag (e.g. metals, liquids)
  • Background Noise
recommendations for tag placements
Recommendations for Tag Placements
  • Parallel to antenna
  • Away from metals
  • Within reading range of antenna (~25 cm)
ti rfid hf 13 56 mhz antenna
TI RFID HF 13.56 MHz Antenna
  • Used to transmit and receive signals.
  • Used for Magnetic
  • Tuned at 13.56 MHz
  • Input Impedance of 50 Ohms
loop antenna in house
Loop Antenna (In House)
  • Followed Texas Instruments’ Antenna Cookbook
  • 50cm x 50cm
  • Made of copper tape and wooden board
  • T-matching network
  • Reading range of 1 mm (SWR ~ 2.2)
loop antenna ri ant t01a
Loop Antenna (RI-ANT-T01A)
  • Dimension: 337mm x 322mm x 38mm
  • Matched to 50 Ohms
  • Maximum Reading Range: 50cm
loop antenna ri ant t01a25

Black will have better contrast on a projector

Loop Antenna (RI-ANT-T01A)
  • Measurement Results 1: Vertical, Away from Metal
  • SWR = 1.004
loop antenna ri ant t01a26

Black will have better contrast on a projector

Loop Antenna (RI-ANT-T01A)
  • Measurement Results 2: Horizontal, Sitting on Lab Table
  • SWR = 1.636
loop antenna ri ant t01a27

Black will have better contrast on a projector

Loop Antenna (RI-ANT-T01A)
  • Measurement Results 3: Close to Lab Equipments
  • SWR = 5.111
overall z parameters

Black will have better contrast on a projector

Overall Z-Parameters
  • SIMS System + Antenna Results During Operation
  • SWR = 1.349
factors influencing antenna impedance
Factors Influencing Antenna Impedance
  • Orientation
  • Environment (e.g. metals, liquids)
  • Noise
      • Antenna is operating always in near field since wavelength is 22 meters!
antenna recommendations

Just about the maximum amount of text on a slide

Antenna Recommendations
  • Antennae must be placed first, then tuned.
  • May need multiple antennae at one station for more complete coverage (and avoid nulls from environmental factors)
  • Larger antennae for longer reading range
  • Do notcompletely trust antenna cookbooks because they are unreliable!  Buy one antenna firstand analyze it.
software
Software
  • PERL software
    • Takes in user input and sends out two HEX digits through RS232 serial port (I/O)
  • PIC software
    • Takes in input from RS232 serial port and sends logic high to corresponding pins
perl software
PERL Software
  • Serial.pl
    • Takes in keyboard inputs in HEX
      • Must read header “AF” followed by two HEX digits (e.g. AF06)
    • Send out input from COM 2 to PIC
    • Checks to see if PIC received correct signal
pic software
PIC Software
  • Switch0331.hex
    • Takes input from RS232 and sends logic high to corresponding outputs
    • Will only respond if header “AF” is seen
    • Sends back to PC its output
room setup
Room Setup
  • Map out room and give coordinates to each antenna
  • For example, antenna B-2 can correspond to the secretary’s desk
future hardware development
Future Hardware Development
  • Improved Switching Unit for longer lifetime and higher signal isolation
  • Increased number of antenna outputs
  • Improved Antenna Design
    • Larger loop antenna
    • More stable impedance matching network and BALUN
future software development
Future Software Development
  • Friendly user online interface (HTML)
  • Information processing on transponder data
  • Network with central server
credits
Credits
  • Mr. Richard Martin Cantzler, II
  • Professor P. Scott Carney
  • Mr. Nicholas Soldner
  • Professor Jennifer T. Bernhard
  • Professor Steven J. Franke