ATTENDANCE SYSTEM: RFID BASED

Intro:
Main concept behind Radio Frequency Identification (RFID) based attendance system is to take the attendance of students or employees in any college or university or company. RFid card has to be shown in front of the RFid reader, then the attendance of the respective person is noted down in the microcontroller memory. The system has uniquely identify method  to make attendance for a person. This requires a unique id, which has the capability of distinguishing different person. This is possible by the new emerging technology RFID (Radio Frequency Identification). The main parts of an RFID system are RFID tag (with unique ID number) and RFID reader (for reading the RFID tag). In this system, RFID tag and RFID reader used are operating at 125KHz. The EEPROM used for storing the details has the capability of storing 256 person details at a time. The PC can be used for restoring all the details of attendance made.

Block Diagram:

What is RFID.

RFID is short for Radio Frequency Identification. Generally a RFID system consists of 2 parts.  A Reader, and one or more Transponders, also known as Tags. RFID systems evolved from barcode labels as a means to automatically identify and track products and people. You will be generally familiar with RFID

systems as seen in:

• Access Control:RFID Readers placed at entrances that require a person to pass their proximity card (RF tag) to be"read' before the access can be made. 
• Contact less Payment Systems:RFID tags used to carry payment information. RFIDs are particular suited to electronic Toll collection systems. Tags attached to vehicles, or carried by people transmit payment information to a fixed reader attached to a Toll station. Payments are then routinely deducted from a users account, or information is changed directly on the RFID tag.
• Product Tracking and Inventory Control: RFID systems are commonly used to track and record the movement of ordinary items such as library books, clothes, factory pallets, electrical goods and numerous items.

Circuitry: 

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