Transcript JSM Hammer`s Can`tTouchThis

JSM Hammer’s
Can’tTouchThis
Mid-Semester Demo
http://www.ece.cmu.edu/~ece549/spring07/team8/
Re-cap : Project Concept
•Concept:
•This project will act as deterrence against laptop thefts,
providing the owner a greater degree of security.
•The prototype integrates off-the-shelf embedded
components, such as motion-sensing accelerometer, buzzer,
RFID reader and tags for passive activation of the device and
the Tmote Sensor.
•Motivation:
•A laptop owner today is unable to leave his/her laptop
unattended without risk of the laptop being stolen.
•Using our prototype system, an alarm will be activated if the
laptop is being handled by unauthorized personnel.
System Architecture
Status Update
•Accomplished:
•Telos Motes can now send and receive messages to Java application
•Accelerometer can send readings to Telos mote
•Arm and disarm state accomplished
•Buzzer will sound when unauthorized motion detected
•Risk mitigated
•R1. Compatibility between RFID reader and Telos Motes
•R2. Compatibility between voltage regulator, RFID reader and Telos
Motes
•R3. Compatibility of rechargeable battery with rechargeable
mechanism on Telos Motes
•R4. Real-world performance of RFID reader with respect to range
•R5. Constraints with respect to the ports available on Telos Motes
•R6. Difficulty in finding suitable algorithms differentiating significant
and non-significant movements
•R7. Usage under different laptop operating environments
Parts and Pictures
Breadboard
Accelerometer
Buzzer
Rechargeable battery
Telos Mote
TI RFID reader
TI RFID cards
Demo Scenario
•Connection phase
•Arming
•Detect movement and sound alarm
•Disarm
•Detect movement and no alarm
Next Steps
•Have RFID reader to work with Telos mote (SW & HW).
•Password setup and password screen pop-up.
•Integrate the components into a more compact device
Software Architecture
Lessons Learnt
•Sort out workspace properly and backup frequently.
•De-soldering can be pain.
•For accelerometer readings, we can use the Message
Interface Generator (MIG) to generates a Java class
representing a TOS message. This allows easier
manipulation of the readings.
•Communicating to Telos mote through UART can be
confusing: format of message to send, or simply send
single bytes, and initially it prints out in ASCII.
•When encountering an extended period of doubt, its
time to look for TA(s).
Tentative Schedule
Week 7
Mid-Sem demo
(stillCanTouchThis)
Week 8
Spring Break
(notTouchingThis)
Week 9
Work on RFID and voltage regulator
(startToTouchThisAgain)
Week 10
Settle all hardware issues
Week 11
Software (password configuration)
Vigorous testing
Week 12
Tie up loose ends &
prevent trivial attacks on system
(finishTouchingThis)
Week 13
Final Demo
(REALLYcan’tTouchThis)
Q&A