Between the Tag and the Screen - Arkitektur- og designhøgskolen i ...

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Between the Tag and the Screen - Arkitektur- og designhøgskolen i ...

B E T W E E N T H E T A G A N D T H E S C R E E Na gap. SR-RFID technology exemplifies this continuum by having bothstrong temporal and spatial qualities.SR-RFID technology already allows us to unlock a door or pay on thesubway, all by a simple swipe of an RFID-enabled card over an RFID reader.The simplicity of a touch or swipe interaction has become synonymous withSR-RFID. However, a great deal of complexity related to the forming of SR-RFID interaction may be found beyond the simplified notion of a touch. Inexploring this, I will now present the technology and related works thatinvestigate various aspects of RFID-driven interactions.RFID technologyWe can consider RFID a collection of technologies that share somefundamental traits. In essence, it consists of radio transmitters that cancommunicate with small tags known as RFID tags. Figure 2.6 showsexamples of SR-RFID readers, and Figure 2.7 shows an array of SR-RFIDtags. One recognises three types of tags: passive, active and hybrid. Thepassive tag serves as a radio reflector and uses an incoming radio signal froman RFID reader to generate power, enabling it to send a signal back to theRFID reader. Active tags have an embedded power source, normally in theform of a battery, enabling them to send signals autonomously. Hybrid tagshave embedded batteries but rely on an incoming signal to trigger theresponse signal, thus enabling much greater read and send ranges. The readand send ranges of RFID varies significantly and range from a fewmillimetres up to several meters.Figure 2.6. There are many kinds of RFID readers. The image shows a small collection takenfrom the Touch project’s archive of technologies.22

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