Wireless Sensor Networks by Craig Young and Chris Theodoridis

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Presentation transcript:

Wireless Sensor Networks by Craig Young and Chris Theodoridis

Context, Problem, and Motivation WSNs used when difficult or expensive to monitor data using wired sensors Environmental monitoring Military surveillance Inventory tracking Problems arise with responsiveness and battery consumption of nodes More efficient WSNs could save lives and prevent damages

Background Research MICAz 2.4 to 2.4835 GHz IEEE 802.15.4 compliant 250 kbps data rate Runs TinyOS 1.1.7 and higher

Background Research Sensor Boards and Base Station Sensor Boards(MTS300CA/MTS310CA) Light, temperature, and microphone sensors Compatible with MICA, MICA2, and MICAz Base Station Allows aggregation of sensor network data onto PC Any MICAz can act as a base station by plugging into a serial interface board

Work Outline Install necessary software Create basic multi-hop network for testing Decrease update time for the motes Determine lowest threshold of performance Switch to an event-based system Create updated network for demo

Work Done Installation Installation of IBM Java Installation of Cygwin and TinyOS Installation of 5 RPM files Installation of MoteView 1.4 GUI to facilitate programming/reading motes Switch from SurgeReliable to XMesh

Work Done One-Hop Network One-Hop network implemented Default refresh rate approximately 7 seconds SurgeM and Surge.h were altered in order to shorten the refresh rate Refresh rate shortened to approximately 1 second

Work Done Multi-Hop Network Synchronized Counter One node generates counter based on internal clock and flashes LEDs accordingly Other node synchronizes flashing of LEDs by receiving transmitted signal from first node Surge-Reliable Program Collection of data from sensor boards Problems: recognizing nodes, battery power

Work Done Decreasing the Update Time XMesh permits 300 millisecond refresh rate No performance penalties Battery voltage dropped below 2.3V Sensors unable to communicate properly Not enough time to work on event-based system Battery voltage now at 3V

Results Surge Reliable Graphs

Results Voltage Readings

Results Dropped Packets

Results XServeterm

Results XServe Webpage

Summary Importance of Wireless Sensor Networks MICAz instead of MICA2 XMesh instead of SurgeReliable Refresh rate lowered to 300 milliseconds Battery voltage must be above 2.3V

QUESTIONS???