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Alexander Wülfing Patrick Preuß. Wireless Sensor Networks . Scatterweb. Dresden, 28.11.2006. Szenario: Temperature measurement in the Baltic Sea. Motivation . Problems energy supply communication distance to main station developing costs/time for sensor network.

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  1. Alexander Wülfing Patrick Preuß Wireless Sensor Networks Scatterweb Dresden, 28.11.2006

  2. Szenario: Temperature measurement in the Baltic Sea Motivation • Problems • energy supply • communication • distance to main station • developing costs/time for sensor • network © http://www.allthesea.com/img/Baltic-Sea.jpg Scatterweb

  3. Motivation All-In-One-Solution • Scatterweb Scatterweb © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-Overview-140504.pdf

  4. Concept behind © http://www.scatterweb.net • transmission redundancy • license free wireless communication • energy efficiency • hardware modularity • over-the-air reprogramming Scatterweb

  5. Architecture Scatterweb

  6. Architecture © http://www.scatterweb.net • Node • modular design • add-on board for specific sensor • transmission range: 10m – 1.5km • frequency hopping © http://www.scatterweb.net Scatterweb

  7. Architecture - Node • separation task / firmware • stable core • SW updates stored in EEPROM first • flashing: synchronized by time / command; checksum comparison © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-Overview-140504.pdf Scatterweb

  8. Architecture • Gateway • receives data from Node and transmits it to the PC • USB or Ethernet version available © http://www.scatterweb.net © http://www.scatterweb.net Scatterweb

  9. Architecture • Software • network control and maintenance • data visualisation (i.e. tracking of persons) • over-the-air updates during runtime © http://www.scatterweb.net Scatterweb

  10. Implementation – Hardware Entities Scatterweb

  11. Nodes and Gateways • NODES (gain informations through included sensors) • ECR (Embedded Chip Radio) • ESB (Embedded Sensor Board) • GATEWAYS (connect the nodes with other devices) • eGATE/USB • eGATE/WEB Scatterweb

  12. © http://www.scatterweb.com/research_products/pictures/ecr_small.jpg ECR (Embedded Chip Radio) • minimal functions: • It contains only a temperature and vibration sensor (e.g. detection of • earthquakes) -> current price 89 € • the node contains severall I/O Ports (digital) -> other sensors can be attached • energy: battery compartment (C battery or accumulator) • controller: MSP-430 from Texas Instruments (low power consumption, perfect for • ECRs which gain their power from batteries), wake up via interrupt • possible (you can wake up the controller even by shaking through a • special sensor) • communication: radio transceiver (TR1001, small, consumes very little power up • to 4.0 V) © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/images/hardware/ecr/tr1001.gif Scatterweb

  13. © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/images/hardware/esb.jpg ESB – Embedded Sensor Board • Offers a lot of functions: • different kinds of sensors, e.g. • PIR (passive infrared) movement detection, range nearly 8m • temperature • vibration • beeper (95 dB maximum) • microphone • current price: 149 € • energy: supports different power sources, input voltage 3V • battery compartment (3AAA/accumulator), possibility of recharging through • solar cells Scatterweb

  14. ESB – Embedded Sensor Board (2) • controller: MSB-430 (the same like ESC) • communication: TR-1001 • Some typical values which shows the low-power design: • ESB in sleep mode: 8µA, ESB-Transmit-Data: 8mA, ESB running: 12mA • 17 years lifetime, if the ESB just sends 25byte every 20 sec. Scatterweb

  15. eGate/USB – Embedded Gate/USB • connects PC/PDA over USB with the sensornet • drivers available for Windows/Linux • communication also through TR-1001 • ceramic antenna for a range of 850 MHz-950 MHz © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-HannoverMesse-04-2004.pdf Scatterweb

  16. eGate/WEB – Embedded Gate/WEB • RJ-45 connection • power over ethernet • integrated web server, therefore easy access through a WEB-Client © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-16-09-2004.pdf Scatterweb

  17. Solar-aware Routing • current status is sent to neighbours • main data route over nodes with high energy status © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-Overview-140504.pdf Scatterweb

  18. Localisation • distance calculation based on transmission power • only for open space (closed space: echos, reflections, refraction, …) © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-16-09-2004.pdf Scatterweb

  19. Outlook – ideas for future versions • nested Queries  conditional sensing (e.g. intrusion detection) • value dependent sending (only sends when sth. has changed) • shorter listening times • slotted listening periods with onboard realtime-clock © http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-16-09-2004.pdf Scatterweb

  20. Reference • http://www.allthesea.com/img/Baltic-Sea.jpg • http://www.scatterweb.com/downloads/data_sheets.en.html • http://www.scatterweb.com • http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents.htm • http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/ • http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/Schiller_Workshop-100504.pdf • http://www.inf.fu-berlin.de/inst/ag-tech/scatterweb_net/documents/ScatterWeb-Overview-140504.pdf • http://www.rfm.com/products/data/tr1001.pdf Scatterweb

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