Gadget Download

                           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  tags  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.