Safeguard anti theft reminder transmitter group 3 carson hammoser peter lin albert uang samuel wong
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SafeGuard: Anti-Theft/Reminder Transmitter Group: #3 Carson Hammoser Peter Lin Albert Uang Samuel Wong The Problem Lost and Forgotten Items Lost Property Office of Transport for London 130 000 items between April 2003 and March 2004

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Safeguard anti theft reminder transmitter group 3 carson hammoser peter lin albert uang samuel wong l.jpg

SafeGuard: Anti-Theft/Reminder Transmitter

Group: #3

Carson Hammoser

Peter Lin

Albert Uang

Samuel Wong


The problem l.jpg
The Problem

  • Lost and Forgotten Items

    • Lost Property Office of Transport for London 130 000 items between April 2003 and March 2004

    • 11300 Laptops, 31400 PDA’s, 200 000 Cell phones Left in the backs of cabs

  • Security

    • 5035 Pickpocket crimes in London Underground

  • Keeping Track of Kids and Pets

    • 58200 Child Abductions in US


Solution l.jpg
Solution

  • A tracking device that warns the user when things are left behind or move too far away

  • Able to track multiple items

  • Able to recognize each item


Proposed product the safeguard l.jpg
Proposed Product: The SafeGuard

  • Wireless electronic tether

  • Tracks multiple objects on one transmitter

  • Audio warning when items are out of range

  • Programmable Identification of Item



System overview6 l.jpg
System Overview:

  • User places RF tags on selected items

    • Clip to your Cell phone/PDA

    • Slip into your wallet / jacket pocket

    • Place In glasses Case

    • Place in backpack/briefcase


System overview7 l.jpg
System Overview:

  • User carries an RF Receiver

  • LCD Display

  • Piezoelectric Buzzer

  • Joystick Interface

  • Activate/Sleep/Deactivate

Insert Receiver Picture



Transmitter hardware l.jpg
Transmitter Hardware

  • Atmel ATTiny2313

  • Chipcon CC1000 Transceiver

    • Low Current Consumption

    • Small

  • Antennae Design


Attiny2313 l.jpg
ATTiny2313

  • Larger File Size

  • SRAM

  • Watchdog Timer

  • UART

  • Small package

  • SPI


Cc1000 l.jpg
CC1000

  • Operating Frequency

  • Configuration

    • SmartRF Studio






Receiver hardware l.jpg
Receiver Hardware

  • ATMega32

  • LINX RXM-900-HP-II

  • LCD

  • Joystick


Atmega32l l.jpg
ATMega32L

  • Low Current Consumption

  • RISC Architecture

  • 32K Flash Memory

  • 1024 Bytes EEPROM

  • 3 Counters

  • Programmable Serial UART

  • Input Capture

  • 3 External Interrupts


Linx rxm 900 hp ii l.jpg
LINX RXM-900-HP-II

  • Programmable Carrier Frequencies

  • Direct Serial Interface

  • No External RF Components

  • No Tuning Required

  • Easy Usage


Slide21 l.jpg
LCD

  • Standard Hitachi HD44780 Driver

  • Small compact size

  • ~2mA consumption

  • Command Set


Joystick l.jpg
Joystick

  • Low amounts of board real-estate

  • Multidirectional Usage

  • Intuitive User Interface

  • De-bouncing


Receiver scheme l.jpg
Receiver Scheme

  • Timer Interrupt Polls

  • Receives a Constant Pulse

  • Interrupt

  • Input Capture

  • Checks Pulse Width

  • Changes Frequencies


Batteries l.jpg
Batteries

  • 2032

  • 2477

  • Good Supply Voltage

  • Low Battery Profile

  • Reasonable Supply Curve

  • mAh


Problems and solutions l.jpg
Problems and Solutions

  • ATTiny12

  • Antennas and attenuation

  • RF Boards – Current Draw

  • Initialization of the CC1000

  • Soldering the CC1000

  • Doesn’t flash with components connected

  • LCD Initialization failure

  • LCD Buffer Circuit


Things to complete further work l.jpg
Things to Complete/Further Work

  • Build multiple transmitters

  • Utilize a CDMA scheme to increase resilience to noise and free up channels

  • Implement a sleep/watchdog timer

  • Minimize package



Personal reflections l.jpg
Personal Reflections

  • NEVER try to fabricate your own boards for RF

  • Avoid prototyping with surface mounts

  • Multiply projected timelines by 4 as opposed to 2

  • The best place to crash is the Sunny room


Conclusion l.jpg
Conclusion

  • Good experience taking a project from scratch to close to completion

  • Learned to deal with group dynamics

  • Sleep is an option not a necessity


Thank you l.jpg

Thank You

Questions


References l.jpg
References

  • “Lost and Found.com: The Internet Lost and Found,” [Online Document]

    Available: http://www.internetlostandfound.com/

  • “Lost Property Office - Statistics,” [Online document]

    Available: http://www.tfl.gov.uk/tfl/ph_lost-stats.shtml

  • “Survey: Thousands Leave Laptops, Mobiles in Cabs,” Jan. 24, 2005 [Online document]

    Available: http://edition.cnn.com/2005/TECH/ptech/01/24/taxis.lost.reut/index.html

  • “New Tube Crackdown Puts Pickpockets on the Run,” [Online document]

    Available: http://tube.tfl.gov.uk/content/pressreleases/0110/29.asp

  • “1551KGY” Image. http://www.hammondmfg.com/1551K2B.jpg

  • Smith, Kent (RFM). “Antennas for Low Power Applications”. Feb 8, 2005. www.rfm.com/corp/appdata/antenna.pdf

  • “Atmel SOIC” http://sub.chipdoc.ru/im/atmel/avr/2313_p.gif

  • “Atmel TQFP” http://www.epsilon.com.pl/img/at90s8515_tqfp2b_250.jpg

  • “TPA Navigation Tact Switch” http://www.ittcannon.com/media/pdf/catalogs/tpa.pdf

  • “HP Tx and Rx” http://www.linxtechnologies.com/index.php?section=products&category=rf_modules&subcategory=hp-3_series

  • “Peter Ouwehand.“How to control a HD44780-based Character-LCD. 2005. http://home.iae.nl/users/pouweha/lcd/lcd0.shtml

  • “2032” http://rocky.digikey.com/WebLib/Panasonic/Web%20Photos/CR2032.jpg


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