Wirelessly-Charged UHF Tags for Sensor Data Collection
Yeager, D.J.
Powledge, P.S.
Prasad, R.
Wetherall, D.
Smith, J.R.
Dept. of Electr. Eng., Univ. of Washington, Seattle, WA;
This paper appears in: RFID, 2008 IEEE International Conference on
Publication Date: 16-17 April 2008
On page(s): 320-327
Location: Las Vegas, NV,
ISBN: 978-1-4244-1711-7
INSPEC Accession Number: 10039590
Digital Object Identifier: 10.1109/RFID.2008.4519381
Current Version Published: 2008-05-14
Abstract
We present the WISP passive data logger (PDL), an RFID sensor data logging platform that relies on a new, wirelessly-charged power model. A PDL has no battery yet (unlike a passive sensor tag) is able to collect data while away from an RFID reader. A PDL senses and logs data using energy stored in a capacitor; the capacitor can be wirelessly recharged (unlike active tags), and data can be uploaded whenever the PDL is near a reader. Standard EPC generation 2 readers are used for WISP-PDL charging, ID-reading, and sensor data transfer. This allows WISP-PDLs to operate using commercial RFID readers as the only support infrastructure (for both data and power), and allows WISP-PDLs to co-exist with standard RFID tags. We describe the design and implementation of a prototype WISP-PDL, and report results from a short demonstration study that shows it can monitor the temperature and fullness of a milk carton as it is used over the course of a day.
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