Wireless Sensor NetworksPresented By:Corey PittmanOutlineIntroductionWireless Sensor NetworksApplications of Wireless Sensor NetworksSensor NodesConstraintsCommunication ArchitectureConclusionIntroductionClassical sensors can be Low number of distant, complex sensors use complex methods to reduce noise.Several dedicated sensors are carefully placed around a phenomenon. Wireless Sensor Networks consist of a very large number of sensor nodes that are deployed in or around the phenomenon.Arrangement doesn't matter.Process data before transmitting.Wireless Sensor NetworksConsist of a large number of nodes.Contain sensors for many ambient conditions, such as:TemperatureHumidityPressureNoiseCan constantly feed information about events or upon request.Wireless, Can be deployed without worrying much about layout.Applications MilitaryMonitoring friendliesSurveillance/ReconnaissanceTargetingEnvironmentalForest fire detectionFlood detectionPrecision Agriculture Home AutomationInventory ManagementFleet TrackingWhat is a Sensor Node?Also called a mote, it is a node in a wireless network.Typically developed using low cost components.Main components include: Processing Unit/Micro-controller Tranceiver External Memory Power Source Sensor(s)ExamplesSun SPOTSmart DustDiagram ADC is Analog to Digital converterConstraintsConsume Low PowerOperate efficiently in high numbersBe "cheap"Be AdaptiveAutonomousPropertiesFault ToleranceBattlefield vs Home EnvironmentScalabilityPutting sensors on everythingProduction costsCost of WSN < Traditional SensorsPiconode's goal is price under $1ResilienceFunction properly under high pressure.DeploymentDeployment phase Drop from plane, delivery from projectile, catapult Careful placement by humanPost-deployment phase Malfunction, energy depletion, and other topology changes mean that the network must be dynamic.Communication ArchitectureSensors are scattered in the sensor field.Collect data from one another and route to sink.Client can find information from sink via Internet.LayoutSensor Networks ProtocolTransport layer Sink to nodes is UDP, Sink to Internet is TCP Network layerSPIN protocol (Advertise, Request, Data)Directed Diffusion Physical layerUltra Wide Band Low transmission power and simple tranceiverModern Smart "Dust"One million HP-made motes are to be deployed over a 6 square mile to monitor rock vibrations near oil exploration.Each is the size of a matchbook.ReferencesWireless Sensor Networks: A Survey Akyildiz, Su, Et. Al."'Smart dust' aims to monitor everything"http://articles.cnn.com/2010-05-03/tech/smart.dust.sensors_1_smart-dust-sensors-kris-pister?_s=PM:TECHWireless Sensor Networks & Sensor Nodes WikipediaConclusionSmart Dust will not become the deadly nanotechnology of '50s sci-fi anytime
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