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A brief overview of WattDepot, a system for collection, storage, analysis, and visualization of energy data.
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WattDepot:A software ecosystem for
energy data collection, storage, analysis, and
visualization
Robert S. Brewer, Philip M. Johnson
Collaborative Software Development Laboratory
Information and Computer Sciences Dept
University of Hawaii at Manoa
http://csdl.ics.hawaii.edu/
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Motivation Research on changing energy use behaviors• Need to collect & analyze energy data
Requirements• Collect data from many meters• Sub-minute data collection• Easy to simulate sensor data• Internet-accessible repository• Visualization variety & flexibility• Open source
Could not find an existing solution• Developed WattDepot
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Architecture
Devices MetersWattDepotSensors
WattDepotServer
WattDepotClients
HTTPHTTP
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Sensors Software to collect data• Interface to specific meters• Store data in server via HTTP
Designed for flexibility• Encapsulates vendor-specific code• Any platform or language• Just needs to output XML over HTTP
Current implementations• TED 5000 home energy meter• Veris power meters• Modbus/TCP meters
Sensors
Server
Clients
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Servers Central data repository• RESTful HTTP API• Pluggable back-end database• Data represented as XML or JSON• Devices represented as Sources
Server-side capabilities• Aggregation of sources (virtual sources)• Data interpolation
Sensors
Server
Clients
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Servers: Virtual Sources Virtual sources combine sub-sources• Maps real-world entities to system• Hierarchy can be multi-level
But meter clocks may not be synchronized
Saunders Hall
Floor 2 North
Saunders Hall
Floor 2 South
Saunders Hall
Floor 2
Saunders Hall
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Servers: Timestamp Problem Unsynchronized clocks cause problems• Naïve data comparison difficult
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Servers: Data Interpolation Data resampling at arbitrary times• Linearly interpolate between data points• Solves timestamp problem for virtual sources
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Clients Data extraction & visualization• Any platform or language• Using REST or Google Visualization APIs
Current implementations• Real-time monitors• Charts• Geographic visualizations• Android mobile application• All independent of data input source
Sensors
Server
Clients
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Clients: Heatmap and Gauge
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Clients: GeoMap
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System Availability Hosted on Google Code• http://wattdepot.googlecode.com/• Open source under New BSD license
Discussion list• http://groups.google.com/group/wattdepot-users
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