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The Hitchhiker’s Guide to Successful Residential Sensing Deployments. Timothy W. Hnat , Vijay Shrinivasan , Jiakang Lu, Tamim I. Sookoor , Raymond Dawson, John Stankovic , and Kamin Whitehouse. Sensing in Homes. Energy Management. Home Automation. Medical Monitoring.
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The Hitchhiker’s Guide to Successful Residential Sensing Deployments Timothy W. Hnat, Vijay Shrinivasan, Jiakang Lu, Tamim I. Sookoor, Raymond Dawson, John Stankovic, and Kamin Whitehouse
Sensing in Homes Energy Management Home Automation Medical Monitoring People spend 65% of time in their homes
Sensing in Homes Indoors is hard too! Extreme Environments Photo courtesy of: Jan Beutel
Sensing in Homes #Sensors < #Outlets #Sensors > #Outlets Difficulty #Sensors 1200 sensors Over 20 homes Up to 1 year/home
Sensing in Homes #Homes < #Researchers #Homes > #Researchers Difficulty #Sensors #Homes 1200 sensors Over 20 homes Up to 1 year/home
Sensing in Homes #Days < ~1 month #Days > ~1 month Difficulty #Sensors #Homes #Days 1200 sensors Over 20 homes Up to 1 year/home
Outline Deployment Overview Reliability and Failure Analysis A Hitchhiker’s Guide
Outline Deployment Overview Reliability and Failure Analysis A Hitchhiker’s Guide
Fault Analysis Sensors … Time
Fault Analysis Power Outage Sensors … Time Sensor-Days – down time × number of sensors
Fault Analysis Reinstall Hard drive failure Sub-system failure Plug disconnections
Outline Deployment Overview Reliability and Failure Analysis A Hitchhiker’s Guide
Homes are Not a Power Panacea • 30-40 outlets per house • Long wires • 2.3x more down time than batteries • More maintenance calls
Homes Have Poor Connectivity Exploiting Home Automation Protocols for Load Monitoring in Smart Buildings • Wireless connectivity • Power line communications • Wires • 180bit/s • 5 min polling rate
Homes are Hazardous Environments • Children • Mobile objects • Roomba • Guests and cleaning services
Homes are Remote Environments • Minimize installation time • Scout • Lab assembly and configuration • Checklists
Expect Limited User Participation Button Tracking Wearable Tracking Self-reporting Surveys 22
Aesthetics Matter in Homes Disappear into the woodwork Leave no trace No LEDS at night Noise
Similar Work • Infrastructure-based • Neural Network House, Aware-Home, MavHome, PlaceLab • Infrastructure-less • Tapia, Cook, Kasteren • Lessons Learned • Edwards and Grinter – 7 challenges • “Hitchhiker’s guides for WSN deployments”
Summary AC Power is not abundant or reliable Wireless connectivity is worse than expected Unexpected environmental hazards Houses are remote environments User participation is limited Aesthetics are important COTS are a double-edged sword
Thank You Any questions?