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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


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safeguard anti theft reminder transmitter group 3 carson hammoser peter lin albert uang samuel wong
SafeGuard: Anti-Theft/Reminder Transmitter

Group: #3

Carson Hammoser

Peter Lin

Albert Uang

Samuel Wong

the problem
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
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
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
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
System Overview:
  • User carries an RF Receiver
  • LCD Display
  • Piezoelectric Buzzer
  • Joystick Interface
  • Activate/Sleep/Deactivate

Insert Receiver Picture

transmitter hardware
Transmitter Hardware
  • Atmel ATTiny2313
  • Chipcon CC1000 Transceiver
    • Low Current Consumption
    • Small
  • Antennae Design
attiny2313
ATTiny2313
  • Larger File Size
  • SRAM
  • Watchdog Timer
  • UART
  • Small package
  • SPI
cc1000
CC1000
  • Operating Frequency
  • Configuration
    • SmartRF Studio
receiver hardware
Receiver Hardware
  • ATMega32
  • LINX RXM-900-HP-II
  • LCD
  • Joystick
atmega32l
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
LINX RXM-900-HP-II
  • Programmable Carrier Frequencies
  • Direct Serial Interface
  • No External RF Components
  • No Tuning Required
  • Easy Usage
slide21
LCD
  • Standard Hitachi HD44780 Driver
  • Small compact size
  • ~2mA consumption
  • Command Set
joystick
Joystick
  • Low amounts of board real-estate
  • Multidirectional Usage
  • Intuitive User Interface
  • De-bouncing
receiver scheme
Receiver Scheme
  • Timer Interrupt Polls
  • Receives a Constant Pulse
  • Interrupt
  • Input Capture
  • Checks Pulse Width
  • Changes Frequencies
batteries
Batteries
  • 2032
  • 2477
  • Good Supply Voltage
  • Low Battery Profile
  • Reasonable Supply Curve
  • mAh
problems and solutions
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
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
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
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

Thank You

Questions

references
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