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.
Here we are using AT89S52 controller as a
control unit and 16x2 LCD is used to display the status. EEPROM is used to
store the data.
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.
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