1. Wireless Sensor Networks by Craig Young and Chris Theodoridis

2. 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

3. Background Research MICAz
2.4 to GHz
IEEE compliant
250 kbps data rate
Runs TinyOS and higher

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. Results Surge Reliable Graphs

11. Results Voltage Readings

12. Results Dropped Packets

13. Results XServeterm

14. Results XServe Webpage

15. 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

16. QUESTIONS???