IMPROVING SECURITY AND USABILITY OF LOW COST RFID TAGS
TECHNICAL SPECIFICATIONS:
Title of the project : Improving security and usability of low cost RFID tags
Domain : Embedded Systems Design
Software : Embedded
C, Keil, Proload
Microcontroller : AT89S52
Power Supply : +5V,
750mA Regulated Power Supply
Display : 16
X 2 LCD
ABSTRACT:
RFID is an acronym
for Radio Frequency Identification. This project is a standalone for detecting
the missing tags in RFID system using AT89S52 microcontroller. This project is
useful in all applications where more than two tags are there. RFID is
increasingly used with biometric technologies for security. Primarily, the two
main components involved in a Radio Frequency Identification system are the
Transponder (tags that are attached to the object) and the Interrogator (RFID
reader). Communication between the RFID reader and tags occurs wirelessly and
generally doesn’t require a line of sight between the devices.
RFID tags are categorized as either active
or passive. This project uses passive tags. Read-only tags are typically
passive and are programmed with a unique set of data (usually 32 to 128 bits)
that cannot be modified. The reader has three main functions: energizing,
demodulating and decoding. The antenna emits radio signals to activate the tag
and to read and write data to it.
In this project, the RFID module reader
typically contains a module (transmitter and receiver), a control unit and a
coupling element (antenna). This module is interfaced with the micro controller
and when the card is brought near to the RFID module it reads the data in the
card and displays on the LCD.
This project uses regulated
5v, 750mA power supply. 7805, a three terminal voltage regulator is used for
voltage regulation. Bridge type full wave rectifier is used to rectify the ac
output of secondary of 230/12v step down transformer. The RFID module requires
a separate +5v power supply.
BLOCK DIAGRAM:
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