Michael Buettner
David Wetherall
ABSTRACT
We demonstrate a simple RFID sensor network comprised of an Intel WISP and a commodity UHF RFID reader. WISPs are devices that gather their operating energy from RFID reader transmissions, in the manner of passive RFID tags, and further include sensors, e.g., accelerometers, and provide a very small-scale computing platform. We believe that the small form factor and lack of battery makes the WISP an attractive alternative to motes for many of the original smart dust applications that require very small or long-lived sensors. The Intel WISP that we demonstrate has an ultra-low-power microcontroller, 32K of program space, 8K of flash, and accelerometer and temperature sensors. It harvests power from and communicates sensor data to standard (EPC Class 1 Gen 2) UHF RFID readers with a range of roughly 10 feet. This combination of RFID technology and sensor networks raises many research challenges, such as how to function with intermittent power and how to modify RFID protocols to support sensor queries.
- H. J. Chae, D. J. Yeager, J. R. Smith, and K. Fu. Maximalist cryptography and computation on the wisp uhf rfid tag. In Proc. Conference on RFID Security, 2007.Google Scholar
- EPCglobal. EPC radio-frequency identity protocols class-1 generation-2 UHF RFID protocol for communications at 860 mhz-960 mhz version 1.0.9. 2005.Google Scholar
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- A. P. Sample, D. J. Yeager, P. S. Powledge, and J. R. Smith. Design of an rfid-based battery-free programmable sensing platform. In IEEE Transactions on Instrumentation and Measurement (accepted), 2008.Google Scholar
- D. Yeager, R. Prasad, D. Wetherall, P. Powledge, and J. Smith. Wirelessly-charged uhf tags for sensor data collection. In Proc. IEEE RFID, 2008.Google ScholarCross Ref
- D. J. Yeager, A. P. Sample, and J. R. Smith. Wisp: A passively powered uhf rfid tag with sensing and computation. In M. I. Syed A. Ahson, editor, RFID Handbook: Applications, Technology, Security, and Privacy. CRC Press, 2008.Google Scholar
Index Terms
- RFID sensor networks with the Intel WISP
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