Wireless Sensor Network WSN B 90901026 WSN 3

Wireless Sensor Network (WSN) 電機四 B 90901026 陳宗煌

何謂WSN? (3) § Wireless Sensor Network (WSN): A system consisting of a collective of networked sensor nodes designed to intercommunicate via wireless radio. WSN region 網路 衛星 其他傳輸媒介 server Wireless Data Collector

硬體架構 § Sensor § Processor § Transceiver (antenna on board) § Power

Tiny. OS § 特色: § § § small , only 3450 Bytes for embedded system open source energy efficient 每個Component可分成: § Frame: 固定大小的資料框架 § Command Handler: 基本命令 § Event Handler: 事件發生時…(event-driven) § Task: 簡單的 作描述 § http: //www. tinyos. net/

WSN 的設計考量 § (五)感測網路的傳輸介質(Transmission Media) § (六)感測環境(Environment) § (七)無線感測網路的網路拓樸(Sensor Network Topology) § (八)省電機制(Power Consumption)

WSN網路傳輸方式 § 解決: 利用Multi-hop § 在兩個相對遠距的sensor node中，尋找另一個node當 作轉傳的收發站，則可用接力的方式，來達成不同 node的通訊。 A C B D E F G Broadcast: 會有Flooding的問題 因此… 1. Shortest-path routes 2. Avoids overlap Still researching!!!

實際應用(example) § 1. Environmental monitoring applications (Digital Sun) Precision Agriculture, Water quality management § 2. Structural integrity modeling and monitoring Golden Gate Bridge – San Francisco A thin arch dam - Switzerland

實際應用(example) § 3. Equipment Health Monitoring in Semiconductor Fab Intranet isolation Ad Hoc Mote Network Root Node 80 2. 1 1 M es h Mote + Vibration Sensors § and healthy , military …more

research Redwood microclimate § 70% of H 2 O cycle is through trees, not ground § Can only observe top surface of the forest § Need to understand what happens within the trees Berkeley/SF

Wireless Micro-weather ‘Mote’ § Incident Light Sensors § § battery § § § TAOS total solar § Hamamatsu PAR “dot” mote Power board Power supply § SAFT Li. S 02 battery, ~1 Ah @ 2. 8 V Weatherproof Packaging § HDPE tube with coated sensor boards on both ends of the tube § O-ring seal for two water flows § Additional PVC skirt to provide extra shade and protection against the rain Radiant Light Sensors § PAR and Total Solar Environmental Sensors § Sensirion humidity + temp § Intersema Pressure + temp

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