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Networked Embedded Systems

Networked Embedded Systems. Jan Beutel, ETH Zurich Bernhard Buchli, Federico Ferrari, Matthias Keller, Roman Lim, Dr . Andreas Meier, Christoph Walser, Matthias Woehrle, Mustafa Yuecel, Marco Zimmerling Funding: NCCR MICS, nano-tera.ch, KTI, Siemens, BAFU.

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Networked Embedded Systems

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  1. Networked Embedded Systems Jan Beutel, ETH Zurich Bernhard Buchli, Federico Ferrari, Matthias Keller, Roman Lim, Dr. Andreas Meier, Christoph Walser, Matthias Woehrle, Mustafa Yuecel, Marco Zimmerling Funding: NCCR MICS, nano-tera.ch, KTI, Siemens, BAFU

  2. Networked Embedded Systems - Our Research Topics • Researching Wireless Sensor Networks that work for real • Special class of embedded systems • Networked, distributed • Embedded in the environment, interactive, sensors • Wireless, typically battery powered • Architectures • Tools and methodology • Real-world deployments

  3. PermaSense – Alpine Permafrost Monitoring • Cooperation with Uni Basel and Uni Zurich

  4. PermaSense Deployment Sites 3500 m a.s.l. A scientific instrument for precision sensing and data recovery in environmental extremes

  5. Sensors for Extreme Environments

  6. PermaSense Sensor Node Hardware • Shockfish TinyNode584 • MSP430, 16-bit, 8MHz, 10k SRAM, 48k Flash • LP radio: XE1205 @ 868 MHz • Waterproof housing and connectors • Protective shoe, easy install • Sensor interface board • Interfaces, power control • Temp/humidity monitor • 1 GB memory • 3-year life-time • Single battery, 13 Ah • ~300 A power budget

  7. Dozer Low-Power System Integration contention window • Dozer ultra low-power data gathering system • Beacon based, 1-hop synchronized TDMA • Optimized for ultra-low duty cycles • 0.167% duty-cycle, 0.032mA • System-level, round-robin scheduling • “Application processing window” between data transfers and beacons • Custom DAQ/storage routine data transfer beacon jitter time slot 1 slot 2 slot k [Burri – IPSN2007] Application processing window time slot 1 slot 2 slot k

  8. Detailed Power Profiling

  9. PermaDozer – Total Power Performance Analysis 1/120 sec 1/30 sec 148 uA average power

  10. Base Station with Stacked Mikrotik WLAN Router Gumstix Verdex WLAN Router TinyNode GSM EMP Protectors IP68 Enclosure and Connectors

  11. Mountainview Camera (SA 2008) • A precision eye for quantitative spatial analysis • Terrain movement and snow cover assessment • D-SLR camera with calibrated lenses (Nikon D300, 28mm) • Integrated into the sensor network (low-power) • Activated on demand, sleeping otherwise • Secondary backchannel for data transfers using WLAN

  12. A Design Problem: We can’t bring our patient to the lab!

  13. Winter Conditions on the Matterhorn

  14. Nodes Breaking after 3 Months – Failure Analysis # Lost Packets System Outages Network Disconnect Nodes Reset

  15. Solution: The FlockLab Wireless Testbed (MA 2009)

  16. Physical Reality Impacting Performance Ambient Temperature DAQ Duration Storage Duration time Watchdog Resets

  17. Data Management Tools and Dataflow

  18. Data Management – Online Semantic Data • Global Sensor Network (GSN) • Data streaming framework from EPFL • Organized in “virtual sensors”, i.e. data types/semantics • Hierarchies and concatenation of virtual sensors enable on-line processing • Translates data from machine representation to SI values • Adds metadata Web export Import from field GSN GSN Private Public Metadata ============== Position Sensor type …

  19. Live Data…

  20. Please look at our live demo outside Thank you Interested to join our team? Come see us in ETZ G75. beutel@tik.ee.ethz.ch

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