We present Sensor Andrew, a multidisciplinary campus-wide scalable sensor network that is designed to host a wide range of sensor, actuator and low-power applications. The goals of Sensor Andrew are to support ubiquitous large-scale monitoring, operation and control of infrastructure in a way that is extensible, easy to use, and secure while maintaining privacy. Target applications currently being developed as part of Sensor Andrew include builing emergency, first-responder support, quality of life for the disabled, monitoring and optimization of water distribution systems, building power monitoring and control, social networking, and biometric sensors for campus security. Sensing devices that are used range from cameras and batteryoperated sensor nodes to energy-monitoring devices wired into building power supplies. Some of these sensing devices may also be mobile and require hand-off between different networked regions. Supporting multiple applications and heterogeneous devices requires a standardized communication medium capable of scaling to tens of thousands of sources. In this technical report, we present the architecture underlying Sensor Andrew for managing sensor data collection as well as server-side application interactions. Sensors and actuators are modeled as event nodes in a push-based publish-subscribe architecture. A data handler provides registration, discovery and data logging facilities for each device. The major elements of this architecture have been deployed in five buildings at Carnegie Mellon University, and are comprised of over 1000 sensing points reporting data from multiple communication interfaces. Finally, we describe two different case study applications currently using the infrastructure that benefit from shared information. Design choices, limitations and enhancements across various layers and protocols are also discussed.
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