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BTnodes

BTnodes. Prototyping Wireless Sensor Network Applications with BTnodes Jan Beutel. Siemens Workshop 2004. Overview. Prototyping Wireless Sensor Network applications on real devices in a heterogeneous environment BTnode – Ad hoc networking prototyping platform

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BTnodes

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  1. BTnodes Prototyping Wireless Sensor Network Applications with BTnodes Jan Beutel Siemens Workshop 2004

  2. Overview • Prototyping Wireless Sensor Network applications on real devices in a heterogeneous environment • BTnode – Ad hoc networking prototyping platform • Event driven OS/application integration • Example application

  3. Prototyping Wireless Sensor Networks • A myriad of interacting devices • sensor node heterogeneity • sensing and actuation • user interaction • Smart everyday objects by attaching sensor nodes: • self aware • context sensitive • cooperative • integration into computing environment NCCR-MICS Terminodes

  4. Internet LocalApplication Bluetooth Gateway Backend connectivity • Infrastructure integration • Local applications • Mobile network gateways • GSM • SMS • Wireless LAN • interfacing to other sensor networks • Debugging and monitoring • development • quantitative analysis BTnodes

  5. A look at platform competitors • UC Berkeley motes – Crossbow, MoteIV (Culler) • Motes and IPAQ’s (Estrin) • Mote-on-a-chip “spec” – MoteInc (Hill) • Bluetooth devices • Imotes – Intel Research (Kling) • Blue Wand – Beecon (Zitterbart) • Testbeds • Microsoft wake-on wireless (Bahl) • UCLA i-Badge (Srivastava) • UCLA/WINS/Rockwell nodes (Srivastava) • PicoRadio Testbed (Rabaey) • Other • TeCo Smart It’s (Beigl) • PicoBeacon (Rabaey) • WiseNet (Enz) • ParkTab (Weiser) • Active Bat (Hopper et al.) • full custom radio • proprietary • limited availability • complex and low integration • low power • reduced features • full custom

  6. BTnode architecture • Lightweight wireless communication and computing platform based on a Bluetooth radio module and a microcontroller. • Bluetooth has the advantage of • availability today for experimentation • compatibility to interface to consumer appliances • an abstract, standardized high level digital interface

  7. Current bill of material 50 parts Parts 60 USD Assembly 5 USD Bluetooth 45 USD Unit cost @ 200 units 110 USD BTnode hardware details • Integrated hardware features • 8-Bit RISC, max. 8 MIPS • 128 kB Flash • 64 kB SRAM, 180 kB data cache • operating from 3 cell batteries • integrated antenna • power management • generic sensor I/O 40 mm 61 mm

  8. BTnode System Software • Lightweight OS • event-driven application model • cooperative multithreading • device drivers (UART, RTC, ADC, ...) • static memory allocation • minimum memory footprint • Programming • standard C language • high-level Bluetooth interface • system software available as library • emulation environment on Linux

  9. Bluetooth enabled appliances Communication with other Bluetooth enables devices • standard Bluetooth profiles for SMS, object push and RFCOMM SMS from egg carton Interactive dialog BTnode enabled egg carton

  10. Other BTnode applications • Many successful BTnode applications • The Lighthouse location system [Roemer2003] • Smart product monitoring [Siegemund2002] • Bluetooth enabled appliances[Siegemund2003] • Smart It’s friends [Siegemund2003] • XHOP/R-DSR multihop prototype [Beutel2002] • Distributed positioning – TERRAIN implementation [Frey2003] • Physical activity detection network [Junker2003] • Better avalanche rescue through sensors [Michahelles2002] • Wearable unit with reconfigurable modules [Plessl2003] • Undergrad projects with Lego Mindstorms [Blum2003] • … • Mostly relying on simple point to point data links

  11. Constructing large network topologies • How to construct an ad hoc network topology with Bluetooth • large network, many devices • all devices connected, supporting transparent multihop transport XHOP prototype TreeNet topology

  12. To probe further… • http://www.btnode.ethz.ch

  13. Acknowledgements • BTnode/TreeNet collaborators • Oliver Kasten, Friedemann Mattern, Matthias Ringwald, Kay Römer, Frank Siegemund • Regina Bischoff, Roger Wattenhofer, Aaron Zollinger • Jan Beutel, Matthias Dyer, Lennart Meier, Martin Hinz, Lothar Thiele • Related publications • J. Beutel et al.: Prototyping Wireless Sensor Networks with BTnodes. EWSN 2004. • R. Bischoff and R. Wattenhofer: Analyzing Connectivity-Based Multi-Hop Ad Hoc Positioning, PerCom 2004. • J. Beutel, O. Kasten and M. Ringwald: BTnodes - A Distributed Platform for Sensor Nodes. ACM SenSys 2003. • M. Leopold et al.: Bluetooth and Sensor Networks – A Reality Check. ACM SenSys 2003. • K. Römer: The Lighthouse Location System for Smart Dust. ACM MobiSys 2003. • O. Kasten, M. Langheinrich: First Experiences with Bluetooth in the Smart-Its Distributed Sensor Network. PACT 2001.

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