RFID Library automation is a very innovative and interesting project
that can play avital role in library automation. In this project, each student
and each book are assigned with an RFID card. If a student wants to daw a book
from the library, he has to swipe his Id card and then Book Id card. The system
records the book transaction into the specified student account. Whenever
he wants to
return the book, he has
to follow the same procedure. If the student reaches
the maximum number of drawls of the books, the system alerts with a message on
the LCD.
RFID is an acronym for Radio Frequency Identification. RFID is one
member in the family of Automatic
Identification and Data Capture (AIDC) technologies and is a fast and reliable
means of identifying just about any material object. This project can be used for security
purpose where it
gives information about
the authorized persons
and unauthorized persons. This can be applied in real time systems as
such in recording the attendance,
in the companies,
airports for accessing
the passports and in
industries to know who
are authorized. 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.
Active
RFID tags are powered by an internal battery and are typically read /write,
i.e., tag data can be rewritten and/or modified. An
active tag's memory
size varies according
to application requirements; some
systems operate with
up to 1MB of memory.
Passive RFID tags operate without a separate external power source and
obtain
operating power generated from the reader. This project
uses passive tags. Read-only tags are typically passive and are programmed
with a unique set of data (usually 32
to128 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.
The significant
advantage of all
types of RFID
systems is the
non contact, non-line-of-sight nature of the technology. Tags can be
read through a variety of substances such
as snow, fog,
ice, paint, crusted
grime, and other
visually and environmentally challenging conditions,
where barcodes or
other optically read technologies would
be useless. This project can provide security for the
industries, companies, etc.
This project uses regulated
5v, 500mA 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.
No comments:
Post a Comment