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Wireless Sensor Network (WSN)

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Wireless Sensor Network (WSN) B90901026 Outline WSN WSN?(1) ... – PowerPoint PPT presentation

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Title: Wireless Sensor Network (WSN)


1
Wireless Sensor Network (WSN)
  • ??? B90901026 ???

2
Outline
  • ??
  • ????????
  • WSN????
  • ??
  • ??
  • ??

3
??WSN?(1)
  • ?????????,????????????(UC Berkeley),David
    Culler???????????,????????(Smart
    Dust)???????????????????(DARPA)???,????????????,??
    ????
  • ??????????,????????????????????????,???????????

???
????
4
??WSN?(2)
  • ???sensor , processor , communication
  • ???
  • 1.??
  • 2.????
  • 3.???

5
??WSN?(3)
  • Wireless Sensor Network (WSN) A system
    consisting of a collective of networked sensor
    nodes designed to intercommunicate via wireless
    radio.

WSN region
?? ????????
server
Wireless Data Collector
6
????
  • Sensor
  • Processor
  • Transceiver
  • (antenna on board)
  • Power

7
????
  • 1.????(Sensing Unit)
  • 2.????(Processing Unit)
  • 3.????(Transceiver Unit)
  • 4.??????(Power Unit)

MICA (2002)
Storage?????????????????,?????????????????Proces
sor??CPU,?????????????,???????????????????
??????sensor?sensor????,????????????????????
???????????????,??????????, ?????????????
Sensor??????,???????????????ADC(Analog-to-Digita
l Converters),??????????????????????,?????????????
??
8
??TinyOS
  • ???TinyOS?
  • Sensor????????????????????,???????????????????????
    ???OS,????????,???????,????????????????????OS?
  • ???????
  • UC Berkeley
  • ?????
  • ???????(CPU, memory ???)???????????

9
TinyOS
  • ??
  • small , only 3450 Bytes
  • for embedded system
  • open source
  • energy efficient
  • ??Component???
  • Frame?????????
  • Command Handler????
  • Event Handler?????(event-driven)
  • Task???????
  • http//www.tinyos.net/

10
WSN ???,???.
  • (?)???????(Fault Tolerance)
  • (?)??????(Scalability)
  • (?)??????(Sensor Costs)
  • (?)??????????(Hardware Constraints)

11
WSN ?????
  • (?)?????????(Transmission Media)
  • (?)????(Environment)
  • (?)???????????(Sensor Network Topology)
  • (?)????(Power Consumption)

12
????
  • ?????????????????????????????????????????
  • ???????????,?????????????,??IEEE802.15.4??????????
    ????????????
  • ????????????????????,??????????????
  • ????,?????2.4GHz??,???(Bluetooth)????????????????
    ??????????916MHz??

13
????-???(smart dust)
  • ???????

Speck
14
????-??????
15
????-RF (WEBS??)
  • ???????,???????????,????
  • ?????(??modulator, filter)
  • ?????,size?
  • ????
  • ?????-gt??-gt???-gt??-gt?????
  • Channel Partitioning - TDMA, FDMA, CDMA
  • ?????

MICA
16
??
???!
  • ????????????

17
????
  • ?????
  • 1.????(transmit)
  • 2.????(idle)?
  • 3.????(receive)
  • 4.????(sleep)?
  • ?????????????????????
  • Duty cycle?,??power!!!

18
????????
  • 1.infrastructure????
  • ??central server (AP),??????AP????????

19
????????
  • Ad-hoc?????? central server (AP)? wireless
    Peer-to-Peer ????
  • ?ad-hoc??????,???mobile devices
    ??????????,???mobile devices????????

20
WSN??????
  • WSN??????ad hoc,??????????
  • ????
  • ??sensor node???????node????????????,??sensor?????
    ?IP network??ip address?????????(identification)?
  • sensor node????????(broadcast communication)????ad
    hoc???????(point-to-point)???
  • ??????????,????

21
WSN??????
  • ?? ??Multi-hop
  • ????????sensor node?,?????node????????,????????,??
    ???node????

Broadcast ??Flooding??? ??
1.Shortest-path routes 2.Avoids overlap Still
researching!!!
22
????(example)
  • 1. Environmental monitoring applications (Digital
    Sun)
  • 2. Structural integrity modeling and monitoring

Precision Agriculture, Water quality management
A thin arch dam - Switzerland
Golden Gate Bridge San Francisco
23
????(example)
  • 3. Equipment Health Monitoring
  • in Semiconductor Fab

Intranet
Intranet
Intranet isolation
Intranet isolation
Ad Hoc Mote Network
Ad Hoc Mote Network
Root Node
Root Node
802.11 Mesh
802.11 Mesh
Mote Vibration Sensors
  • and healthy , military more

24
researchRedwood microclimate
  • 70 of H2O cycle is through trees, not ground
  • Can only observe top surface of the forest
  • Need to understand what happens within the trees

25
Wireless Micro-weather Mote
  • Incident Light Sensors
  • TAOS total solar
  • Hamamatsu PAR
  • dot mote
  • Power board
  • Power supply
  • SAFT LiS02 battery, 1 Ah _at_ 2.8V
  • 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

26
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27
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28
conclusion
  • WSN???,?Intel???????????,?????????Intel?Crossbow?D
    igital Sun?Senera?Sensicast Systems???????????,???
    ???????????
  • ??????????????????,??????????????

29
  • ????????
  • ??????
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