Automatic control of students attendance in classrooms using RFID

                 The objective of this project is to design the electronic attendance system by using RFID.
          This project is very used to provide the easy access to maintain the attendance.  In this project RFID card is used as employee or student ID card. This project is very useful to the company and office in order to maintain the employee attendance. Attendance is maintained in the data base in PC. So we can easily cross verify the attendance. In this project we can maintain the employee IN and Out time. We can also use this project in school and college to maintain the attendance of the student. So this project improves the security performance because we cannot make the duplicate RFID card.
Brief methodology:
             This project is designed with
Ø  RFID tag
Ø  RFID reader
Ø  Microcontroller
Ø  RS 232 converter
Ø  Driver circuit with alarm
Ø  Key pad
RFID is the special type wireless card which has inbuilt the embedded chip along with loop antenna. The inbuilt embedded chip represents the 12 digit card number. 
            RFID reader is the circuit which generates 125KHZ magnetic signal. This magnetic signal is transmitted by the loop antenna connected along with this circuit which is used to read the RFID card number.
         In this project RFID card is used as employee or student ID card. So each student or employee has the individual RFID card. RFID reader is interfaced with microcontroller. Here the microcontroller is the flash type reprogrammable microcontroller in which we already programmed with card number. The microcontroller is interfaced with PC through RS 232 converter. The RS232 is used to convert TTL logic to RS 232 logic.
        Here the RTC is interfaced with microcontroller. RTC is the Real Time clock is used to generate real time signal. It is the special type of IC in which battery is in build. Even though power is off it continuously maintains the timing signal. This IC is generally as called RTC. In our project the RTC is used to provide the timing signal to microcontroller.
        When the student or employee shows the RFID card in the reader, the reader will read the number and send to microcontroller. Then the student or employee has to press the personal identification number through key pad.  The microcontroller received the card number and PIN number from the reader and key pad then compares the stored number. If the card and PIN number is valid the microcontroller transfers the corresponding person IN time and date to EEPROM. When the person shows the card again it will take as OUT time send to EEPROM. Here the employee or student information is scored in the EEPROM even though power failure the information will not be deleted. At the end of the day all the data transferred to PC through RS 232. In PC the attendance are maintained in the data base so we can easily cross verified the attendance at any date.
       If the RFID card is not valid for that particular student or employee, the microcontroller will display the “Authentication Fail “on the LCD display and also activate the driver circuit for alarm.  So the alarm makes the sound for indicating the Authentication Fail.
1.      Low power consumption.
2.      Improve security performance in the library.
3.      We can add new student or employee in the database.
4.       Attendances are maintained individually so we can avoid the man made error.
                This project is very useful to the
1.      Colleges
2.      Schools.
3.      Offices
4.      Industrial companies.

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