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Can’tTouchThis

This update discusses the implementation status and testing results for a laptop anti-theft device using Zigbee protocol. The experimentation plan outlines metrics, measurements, and lessons learned for future improvement.

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Can’tTouchThis

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  1. Can’tTouchThis KSM Hammer Jun Wei Chuah Shihong Ng Ming Yang Koh

  2. Status Update • Project Concept: Laptop Anti-theft Device • Status Update (implementation): • Voltage incompatibility of RFID reader, as well as concerns with limited range of RFID • Using Zigbee protocol to communicate between t-motes • Achieved a satisfied level of sensitivity for device • Status Update (testing): • Tested varying degrees of movement • Tested range of Zigbee protocol

  3. Experimentation plan • Metrics: • Range of T-motes • Sets distance at which we arm and disarm the t-mote • Degree of movement of accelerometer • Sets the degree movement to trigger off alarm • How to measure • Conducted 40 trials for each metric • Measured # times in which device is constantly being armed/disarmed for 5 seconds at a particular distance • Measured # times in which alarm is sounded at the various movements

  4. Almost every sudden movement would cause alarm to ring Thief can steal laptop by moving it away slowly Banging of lab table does not cause alarm to sound off most of the times Device will be in disarm mode constantly if user within 1.5 feet Device will likely be in arm mode constantly if user is at 16 feet from device Initial data

  5. Looking forward • Lessons learnt: • Subtleties in tinyOS, • Deluge library prevented buttons from working • Using genericComm instead of which hpluart to send packets • Using Tosmsg->strength instead of Tosmsg->lqi • What is next? • Receiving Tosmsg packets from PC • Setting and testing with different mote IDs • Analyze device for more appropriate sensitivities to movements and range

  6. Questions? Anyone?

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