Transcript WISENET Wireless Sensor Network

WISENET
Wireless Sensor Network
Project Team:
J. Dunne
D. Patnode
Advisors:
Dr. Malinowski
Dr. Schertz
Overview
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Introduction
Design Goals
Design Methodology
Subsystems
Project Success
Future Extensions / Projects
Applications
Conclusion
Introduction
• Wireless Sensor Networks
– One of MIT's 10 emerging technologies
– Low-power systems
– New applications: sensing, controls,
automation
• WISENET: Wireless Sensor Network
– Office environment monitoring
• Temperature, humidity, light
– Quantitively evaluate heating & A/C systems
– Funding & support provided by Honeywell, Int'l.
Design Goals
• Use of Commercial-Off-The-Shelf (COTS)
software & standard interfaces where applicable
– Apache web-server (HTTP)
– MySQL database
– PHP web programming language
• Simple, web-based user interface
• Battery-powered, wireless sensor nodes: 'motes'
• Low-power consumption = Long battery life
• Motes create self-organizing ('ad-hoc') networks
for robust communications
Design Methodology
• Top-Down Design Process:
– Define major subsystems
– Define subsystem interfaces
• Primary Subsystems:
– Client
• Standard Web browser via Internet
– Server
– Wireless mote network
System Block Diagram
Subsystem – Server
WiseDB
• Written in C++
– Utilizes open-source APIs
• Application Programming Interfaces (API)
• MySQL++ database API
• Serial API
• Relays information from mote network to
database
• Sends commands to mote network
Web Program
– Written in PHP4
– Utilizes Charting Software:
ChartDirector v3.0
– Generates 3 Graphs (default)
– Passes Parameters via HTTP GET
• Use bookmarks for specific queries
– Retrieves Data for Specific Mote or All
Motes
Web Program
Data Retrieval Form:
Web Program
Generated Graphs:
System Block Diagram
Subsystem – Sensor Network
Block Diagram – Mote
Picture – Mote
Picture – Mote
Picture – Mote
TinyOS
• Real-time operating system for microcontrollers
• Open-source project at UC Berkeley
• Key Features:
– Developed for sensing applications
– Emphasis on low-power: Idle & sleep modes
– Highly modular architecture
– Efficient utilization of resources
• Currently developed for Atmega microcontrollers
TinyOS
Project Success
– Wisenet is partially operational
• 2 Motes w/ prototype sensor boards
• TinyOS modified for CC1010
• Server running WiseDB + web interface
• Sensor boards are not currently powered by
batteries.
– Problems with DC-DC converter
– Unable to test multi-hop routing due to
lack of motes
Future Projects / Extensions
– Expand network to develop & test
multi-hop routing
– Develop a single-board mote
• Create a expandable, plug-in sensor interface
– Research alternative energy sources
• Solar cell, rechargeable batteries
– Continue development of TinyOS
• Improve tools
• Optimize performance / reduce power usage
– Improve web interface
• Data analysis
Potential Applications
– Lab / Office Monitoring
– Natural Habitat Monitoring
– Automation / Process Control
• Where wired sensors are impractical
– Security Systems
• Intrusion detection & occupancy sensors
– Extreme Weather Surveillance
• Think “Twister”
– Potential Biomedical Applications
• Critical fall alert for the elderly
– Military Reconnaissance
• Monitor battlefields, sensitive locations
Conclusion
– WISENET: Wireless Sensor Network
– Emerging technology that will change the world
– Many real-world applications
– Low-power
– Open-source software
– Modular mote application design (TinyOS)
– Flexible server implementation
– Simple user interface via the web
WISENET is a step to the future of
wireless sensing technology.
Questions?