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JSM Hammer’s

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.

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JSM Hammer’s

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  1. JSM Hammer’s Can’tTouchThis Mid-Semester Demo http://www.ece.cmu.edu/~ece549/spring07/team8/

  2. 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.

  3. System Architecture

  4. 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

  5. Parts and Pictures Breadboard Accelerometer Buzzer Rechargeable battery Telos Mote TI RFID reader TI RFID cards

  6. Demo Scenario • Connection phase • Arming • Detect movement and sound alarm • Disarm • Detect movement and no alarm

  7. 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

  8. Software Architecture

  9. 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).

  10. Tentative Schedule

  11. Q & A

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