Proceedings ArticleDOI
Wirelessly-Charged UHF Tags for Sensor Data Collection
Daniel J. Yeager,Pauline Powledge,Richa Prasad,David Wetherall,Joshua R. Smith +4 more
- pp 320-327
TLDR
The design and implementation of a prototype WISP-PDL is described, and 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.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.read more
Citations
More filters
Journal ArticleDOI
Energy Provisioning in Wireless Rechargeable Sensor Networks
TL;DR: The analysis shows that the deployment methods, by exploiting the physical characteristics of wireless recharging, can greatly reduce the number of readers compared with those assuming traditional coverage models.
Proceedings ArticleDOI
BackFi: High Throughput WiFi Backscatter
TL;DR: It is shown that it is possible to design devices and WiFi APs such that the WiFi AP in the process of transmitting data to normal WiFi clients can decode backscatter signals which the devices generate by modulating information on to the ambient WiFi transmission.
Journal ArticleDOI
— Invited Paper — Backscatter Communication and RFID: Coding, Energy, and MIMO Analysis
Colby Boyer,Sumit Roy +1 more
TL;DR: This work investigates RFID MIMO systems where the channel fading encountered has different statistics than the classical Rayleigh fading model, and finds the trade off between diversity order and spatial multiplexing gains are distinct from wide-area MIMo.
Proceedings ArticleDOI
Recognizing daily activities with RFID-based sensors
TL;DR: A dense sensing approach that uses RFID sensor network technology to recognize human activities in a model apartment concludes that RFid sensor networks are a promising approach for indoor activity monitoring.
Proceedings ArticleDOI
Experimental results with two wireless power transfer systems
TL;DR: The first system harvests VHF or UHF energy from TV towers, with power available depending on range and broadcast transmit power, and is described on an experiment in which 60uW is harvested at a range of about 4km.
References
More filters
Proceedings ArticleDOI
Telos: enabling ultra-low power wireless research
TL;DR: Telos is the latest in a line of motes developed by UC Berkeley to enable wireless sensor network (WSN) research, a new mote design built from scratch based on experiences with previous mote generations, with three major goals to enable experimentation: minimal power consumption, easy to use, and increased software and hardware robustness.
Journal ArticleDOI
Design of an RFID-Based Battery-Free Programmable Sensing Platform
TL;DR: To the authors' knowledge, WISP is the first fully programmable computing platform that can operate using power transmitted from a long-range (UHF) RFID reader and communicate arbitrary multibit data in a single response packet.
Journal ArticleDOI
Inferring activities from interactions with objects
Matthai Philipose,Kenneth P. Fishkin,Mike Perkowitz,Donald J. Patterson,Dieter Fox,Henry Kautz,Dirk Hähnel +6 more
TL;DR: The key observation is that the sequence of objects a person uses while performing an ADL robustly characterizes both the ADL's identity and the quality of its execution.
Book
Capacitive Sensors: Design and Applications
TL;DR: Capacitive sensors in Silicon Technology as discussed by the authors have been shown to have high dielectric properties of various materials, including electret microphones, acceleration sensors, and sensors with different types of connectors.
Journal ArticleDOI
Enabling ubiquitous sensing with RFID
TL;DR: Radio frequency identification has attracted considerable press attention in recent years, and for good reasons: RFID not only replaces traditional barcode technology, it provides additional features and removes boundaries that limited the use of previous alternatives.