Download - RFID in Indoor Location Sensing
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RFID in Indoor Location Sensing
Sucharitha SaibabaDivya Gopinathan
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OBJECTIVE OF THE PROJECT
• To understand the working of RFID system.
• Program the RFID module using PSoC Designer software.
• To read and write data to the tags.
• To distinguish between multiple tags when simultaneously present in the field.
• To demonstrate a practical application of the RFID technology like a small scale Library Management system.
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•RRadio FFrequency IdIdentification
•The only truly automatic AIDC technology
• Provides non-contact, non-line-of-sight operation
• Can be read-only, WORM (write once, read
many) or read/write
• Very difficult to counterfeit
• Capable of working in harsh environments
• Highly capable and proven technology for a wide
range of applications
What is RFID?
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What Constitutes an RFID System?What Constitutes an RFID System?
• One or more RF tags
• Two or more antennas
• One or more interrogators
• One or more host computers
• Appropriate software
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How Does RFID Work?
Reader Antenna
Reader broadcasts signal through antenna
Transponder
Transponder receives signal
Computer System
Reader sends info/data to computer system for logging and processing
Transponder is charged with enough energy to send back an identifying response
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RFID Tag AttributesActive RFID Passive RFID
Tag Power Source Internal to tag Energy transferred using RF from
reader
Tag Battery Yes No
Required signal strength
Very Low Very High
Range Up to 100m Up to 3-5m, usually less
Multi-tag reading 1000’s of tags recognized – up to
100mph
Few hundred within 3m of reader
Data Storage Up to 128 Kb or read/ write & search
128 bytes of read/write
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RFID Technical Design Considerations
– Operating Frequency• Available Frequency Bands• RF Signal Propagation (range, reflections, and material transmittance) • Interference
– Communication Signal• Interrogation Signal with request commands and control• Response Signal with unique identification and data
– Tag Design• Passive or Active Power• Antenna Design and Performance• Integrated Circuit Design
– Reader and Reader Antenna
– Networking Requirements
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How far? How fast? ….....
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RFID Programmer SM2005-B5
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Main Components of the Project
• Cypress PSoC (programmable System-on-Chip) microcontroller.
• This microcontroller comes programmed with a Manchester RF 32/64 signal demodulator and decoder.
• The ChipModule has nine general purpose IO pins and about 4KB of flash memory that can be filled with custom built code.
• The custom code was written using PSOC Designer.
• Loading code is done through RS232C serial interface.
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SMRFID GUI
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Programming the Microcontroller
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Objectives Achieved
• The communication is established between the
microcontroller on the chip module and PC.
• The individual tags are written into and read.
• Distinguish each tag from one another when multiple tags are present in the RF field.
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Future Scope
• How this idea can be extended to a real time location system?
• The RFID readers can be embedded into the environment and the RFID tags carried by each user inform the system of the current location of that user.
• RFID tags are embedded into the environment while users carry RFID readers.
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References
• www.fiatech.org/Presentations/texasinstruments
• www.sonmicro.com
• wwwx.cs.unc.edu/~sparkst/mobile/rfid/RFID
• www.uhisrc.com/FTB/RFID/RFIDsep03
• Blewett,Amin,et al.,”A Simple RF System for Asset Tracking Within Buildings”, IEE,1999
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Thank you!Questions/Comments/Discussion