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The Arduino receives data from the RFID module through this channel.Button 1,2,3,4 are used for selecting the menu and different options within the menu.If you are designing for hobby purpose, such a system can be easily designed using Arduino.
The Wire library, which is used for I2C bus communication, followed by defining the bus address for the RTC as 0x68.
These are followed by two functions that convert decimal numbers to BCD (binary-coded decimal) and vice versa.
The “wire.h” library allows you to communicate with I2C / TWI devices(RTC Module).
The address of the I2C device is mentioned on the beginning of the program.
There are both 7- and 8-bit versions of I2C addresses.
7 bits identify the device, and the eighth bit determines if it’s being written to or read from.Before we begin, please go through our tutorial on how to interface RFID Reader to Arduino and also read our tutorial on RFID based Access Control System using Arduino.The full circuit diagram for interfacing RFID module to Arduino is shown above.The name and ID code of every staff should be enrolled in this array on the programming time.When a person swipes his RFID card, the controller will receive a unique ID code at its RX pin.An RFID based Attendance System is a very interesting project which can be used in different places say in Schools to register the attendance of students and teachers, Private organizations to tabulate monthly working hours of employees and automatically calculate salary based on the number of hours registered in the office and other similar kinds of applications.An RFID based attendance management system can be designed using different types of microcontrollers, say an 8051 series controller, an AVR, a PIC or an ARM controller.The Arduino pins to which the buttons are connected are configured as “INPUT_PULLUP” within in the program.This will eliminate the use of of external pull up resistors by enabling the internal pull ups of Arduino.The same RFID attendance system can also be developed using popular development boards like Arduino, Raspberry Pi etc.The choice of a microcontroller or a development board is purely based on the additional features and functionality you plan to incorporate into the system.