13-06-2012, 12:55 PM
AUTOMATED ATTENDANCE SYSTEM
AUTOMATED ATTENDANCE SYSTEM .docx (Size: 2.98 MB / Downloads: 52)
INTRODUCTION
The two major problems faced by organizations are time consuming manual attendance and wastage of electrical power. Our project is going to solve these problems by using RFID technology. The project is designed to store up to 50 card IDs but it is easily scalable up to 65000 card IDs but for that it requires external memory. Radio Frequency Identification (RFID) is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders. So the RFID is a wireless identification.
Normally the RFID system comprises of two main parts: RFID Reader and RFID Tag. RFID Reader is an integrated or passive network which is used to interrogate information from RFID tag. The RFID Reader may consist of antenna, filters, modulator, demodulator, coupler and a micro processor.
RFID READER
A reader (now more typically referred to as an RFID interrogator) is basically a radio frequency (RF) transmitter and receiver, controlled by a microprocessor or digital signal processor. The reader, using an attached antenna, captures data from tags, then passes the data to the controller for processing. The reader decodes the data encoded in the tags integrated circuit (silicon chip) and the data is passed to the microcontroller for processing
LCD DISPLAY
The display support 2X16 characters, which means, the LCD can support 2 lines on the display and each line can display up to 16 characters which is relevant as the only essential output to be displayed is the student’s name and ID. Besides LCD Display, the output is displayed on LCD. The diagram of LCD display is shown in Figure and the detailed connections of the LCD is shown in table
MICROCONTROLLER
The microcontroller used is PIC 16F877A. Microcontroller is a general-purpose device, but one that is meeting to read performs limited calculations on data, and contained is its environ based on these calculations. The prime use, of Microcontroller is to control the operation of a machine using a fixed program that is stored in and does not change over the lifetime of the system.
POWER SUPPLY
These form an important equipment of any Electronics laboratory. Power supplies are essential for the testing and implementation of any useful electronic circuit. If power supplies are not available then the only way to provide power to a circuit is the battery. For long-term use and frequent manipulation these are not feasible. More over these are not as flexible as modern day power supplies. They do not provide for overload protection and thermal protection.