U of I CS 425 - Distributed Systems “Sensor Networks” (32 pages)

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Distributed Systems “Sensor Networks”



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Distributed Systems “Sensor Networks”

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Lecture Notes


Pages:
32
School:
University of Illinois
Course:
Cs 425 - Distributed Systems
Distributed Systems Documents

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CS 425 Distributed Systems Sensor Networks Indranil Gupta Lecture 21 November 1 2007 Reading Links on website Some questions What is the smallest transistor out there today How would you monitor a a large battlefield for enemy tanks b a large environmental area e g movement of whales c your own backyard for intruders Sensors Coal mines have always had CO CO2 sensors Industry has used sensors for a long time Today Excessive Information Environmentalists collecting data on an island Army needs to know about enemy troop deployments Humans in society face information overload Sensor Networking technology can help filter and process this information And then perhaps respond automatically Growth of a technology requires I Hardware II Operating Systems and Protocols III Killer applications Military and Civilian Sensor Nodes Motivating factors for emergence applications Moore s Law wireless comm MEMS micro electro mechanical systems Canonical Sensor Node contains 1 2 3 4 Sensor s to convert a different energy form to an electrical impulse e g to measure temperature Microprocessor Communications link e g wireless Power source e g battery Example Berkeley Motes or Smart Dust Laser diode III V process Passive CCR comm MEMS polysilicon Analog I O DSP Control COTS CMOS Power capacitor Multi layer ceramic Sensor MEMS bulk surface Solar cell CMOS or III V Can you identify the 4 components here Thick film battery Sol gel V2O5 1 2 mm Example Hardware Size Golem Dust 11 7 cu mm MICA motes Few inches Everything on one chip micro everything processor transceiver battery sensors memory bus MICA 4 MHz 40 Kbps 4 KB SRAM 512 KB Serial Flash lasts 7 days at full blast on 2 x AA batteries Examples Spec 3 03 4 KB RAM 4 MHz clock 19 2 Kbps 40 feet Supposedly 0 30 MICA State of the Art xbow Similar i motes by Intel Types of Sensors Micro sensors MEMS Materials Circuits acceleration vibration gyroscope tilt magnetic heat motion pressure temp light moisture humidity barometric sound Chemical CO



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