EE Capstone Spring 2008

guineanscarletElectronics - Devices

Nov 27, 2013 (3 years and 6 months ago)

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EE Capstone Spring 2008

Team RFID

Mike Gauthiere

Mike Loptien

Chris Reid

Kirk Spowart

Vincent Wu

What are RFID tags?


Two different kinds: transponders and
beacons



Passive tags or transponders are activated
when receiving a signal from a reader,
such as the toll payment system on E
-
470



Powered by the RFID reader



Range from centimeters (ISO 14443) to a
few meters (ISO 18000
-
6) to possibly a few
hundred meters with new Hitachi chip



Features non
-
volatile, writable EEPROM to
store data

What are RFID tags?


Beacons or active tags send a signal with
a unique identifier at preset intervals,
anywhere from once every few seconds to
once a day depending on how important it
is to know the location


The beacon’s signal is often picked up by
at least three different reader antennas to
give accurate location information


Powered by battery life of ~ 10 years


Range of hundreds of meters


Features non
-
volatile writable EEPROM
with more functionality inside than passive
tags


What will we do with
RFID technology?


We will create a General Purpose Handheld
RFID reader


This reader will be able to read RFID tags
placed in multiple locations


The reader will look up information related
to these tags from a database stored on an
SD card


If the information is not found in memory,
the reader will attempt to download the
information via WIFI connection


The information will be displayed in a user
-
friendly format on a touch screen LCD
display

What will we do with
RFID technology?


Audio information will also be
output through a standard
stereo jack on the reader that
can be used with headphones


There will be an option to
select which tag’s information
to display out of all those in
proximity


Signal triangulation could be
used to sense direction and
distance to the detected tags

Artist’s Rendering #1 of RFID Reader

Artist’s Rendering #2 of RFID Reader

Artist’s Rendering #3 of RFID Reader

Real World Applications


Museums


Zoos


Grocery Stores


GPS Trips through
State/National Parks


Highway Signs


Required Function List


Sense and read all RFID tags in
vicinity


Retrieve information tied to sensed
ID’s from database


Database stored on SD card or
downloaded through WIFI connection


User
-
friendly graphical interface,
possibly touch screen controlled

Optional Function List


Standards compliant device, works
with off
-
the
-
shelf standardized RFID
tags


Ability to read both passive and
active RFID tags


Ability to evaluate approximate
distance from tags using signal
strength or triangulation


Ability to read information from
sensor type RFID tags


Block Diagram


Implementation of
Hardware


Processor: ARM 7


May be needed to handle high data volume for screen



RFID transceiver: ID
-
12



125 kHz module w/ RS232 Interface & Built
-
in antenna



Screen: Sharp 4.3” 24bit Sony PSP screen


High resolution color screen for user friendlyness



Touch sensor: 4
-
wire resistive layer


Designed to match size of PSP screen



Battery: 7.4 V 2000 mAH 2 cell LiPo


Lightweight & space efficient, excellent capacity


Should be able to handle power needs & give good battery life


Implementation of
Hardware


RFID tags: 125 kHz passive (ISO 18000
-
2)


Simple to get started with


Would like to be able to read other standardized RFID tags
after success with this one. (Active tags & other passive
tags)



Memory: 1 GB SD memory card


Non
-
Volatile & ubiquitious



To Be Determined:


Audio controller/D to A converter


WIFI controller



Implementation of
Software


Operating system


Handle RFID data, touch device data, etc.



User Interface


Friendly


Graphics intensive


Interpretation of touch information



Local Database: XML File


Human Readable, Standardized



Online Database


Web Server Running PHP Interface to MySQL Database


Send HTTP Response, receive XML formated file

Project Budget

QTY
Item
Price
Total Cost
Part Number
6
Active RFID tags
20
120
varies
10
Passive RFID tags
2
20
EM4001
1
RFID Reader Chip
30
30
ID-12
1
ARM7 Processor
5
5
varies
1
LCD Screen
70
70
PSP
1
Touch Layer
25
25
PSP
1
Battery Pack
60
60
Rechargeable
1
SD Card 1GB
20
20
varies
3
PCB
60
180
varies
3
Dev Boards
80
240
varies
1
Audio Jack & Headphones
15
15
varies
1
Wifi Card
20
20
varies
1
Misc Elec Parts
180
180
varies
Total
985
Schedule

Schedule


PDR: initial design


CDR: order components, PCB design,
board & processor familiarization,
begin hardware modules


Milestone 1: finish RFID transceiver,
memory and screen interface, tag ID
database


Milestone 2: finish touch screen
interface, identify higher priority tags


Expo: finish WIFI interface, audio
output, web database

Division of Responsibilities


Embedded systems &
microprocessors: Mike L/Mike G


Power & batteries: Chris/Mike G


RF & antennas: Kirk/Mike L


Circuit construction: Chris/Vince


Low level software: Kirk/Mike L


High level software: Vince/Mike
G/Chris


Communications: Kirk

Potential Risks of Project


Risk #1: No previous
experience with RFID
technology


Recovery plan #1:
Professor Mihran has a lot
of experience with RFID
technology, so would be a
good resource


Risk #2: Possible reader
confusion in presence of
many different RFID tags


Recovery plan #2:
additional programming
may be needed to create an
anti
-
collision algorithm

Potential Risks of Project


Risk #3: RFID and
GPS technology can
be expensive


Recovery plan #3:
many possible
sources of funding
available such as
UROP grants


Risk #4: Difficulty in
calculating the
distance between
RFID reader and tag


Recovery Plan #4:
Use other methods
of assigning priority,
could be left out if
time is limited

Potential Risks of Project


Risk #5: Possible
touch screen
feasibility issues


Recovery plan #5:
use soft buttons
instead of a touch
screen

Feasibility of Project


RFID communication is a
simple concept, so our
project can have various
degrees of complexity
depending on time


Many different options
available such as touch
screen interface, GPS
integration, WIFI, etc.


Many RFID peripherals and
reader chips exist and are
easy to use

Questions???