The active badge location system
ACM Transactions on Information Systems (TOIS)
You're getting warmer!: how proximity information affects search behavior in physical spaces
CHI '03 Extended Abstracts on Human Factors in Computing Systems
RFIG lamps: interacting with a self-describing world via photosensing wireless tags and projectors
ACM SIGGRAPH 2004 Papers
Photosensing wireless tags for geometric procedures
Communications of the ACM - Special issue: RFID
Bridging the physical and virtual worlds by local connectivity-based physical selection
Personal and Ubiquitous Computing
Proceedings of the 8th international ACM SIGACCESS conference on Computers and accessibility
RFIG lamps: interacting with a self-describing world via photosensing wireless tags and projectors
ACM SIGGRAPH 2006 Courses
RFIG lamps: interacting with a self-describing world via photosensing wireless tags and projectors
SIGGRAPH '05 ACM SIGGRAPH 2005 Courses
Prakash: lighting aware motion capture using photosensing markers and multiplexed illuminators
ACM SIGGRAPH 2007 papers
Proceedings of the 5th international conference on Embedded networked sensor systems
PL-Tags: Detecting Batteryless Tags through the Power Lines in a Building
Pervasive '09 Proceedings of the 7th International Conference on Pervasive Computing
PERVASIVE'07 Proceedings of the 5th international conference on Pervasive computing
uPackage: a package to enable do-it-yourself style ubiquitous services with daily objects
UCS'07 Proceedings of the 4th international conference on Ubiquitous computing systems
UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
PICOntrol: using a handheld projector for direct control of physical devices through visible light
Proceedings of the 25th annual ACM symposium on User interface software and technology
Find my stuff: supporting physical objects search with relative positioning
Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing
Exploring attractions and exhibits with interactive flashlights
Personal and Ubiquitous Computing
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We have designed an active tagging system that responds to a coded optical beam from several meters away. The tags contain a minimalist microprocessor that ambiently operates in shutdown mode and, upon detecting particular frequency components in the AM-modulated interrogation beam, awakens to decode the incident digital message and produce an appropriate response. The lack of linear amplifiers means that these tags draw under 0.5 碌A when sleeping, hence can operate up to 10 years on a lithium coin cell. Such devices are practical demonstrations of the potential of ubiquitous computing where common, nearly passive objects have a sense of identity and the ability to respond to external stimuli. In our example, the interrogator is a "flashlight", with which one scans an area; when the light beam hits a tag programmed with a code that matches that sent by the interrogator, an on-tag LED flashes, indicating that the desired object is "found".