Rfid Secure Access

Topics: RFID, RS-232, Serial port Pages: 22 (6940 words) Published: August 25, 2013
RFID BASED SECURED ACCESS SYSTEM USING 8051 MICROCONTROLLER (AT89C51)

BY N.KALYANI (07241A0272) G.NAVYA CHOWDARY (07241A0282) CH.S.A.L.PAVANI (07241A0286) R.SANDHYA RATNA KUMARI (07241A02A0)

CONTENTS

1. 2. 3. 4.

ABSTRACT SCHEMATIC DIAGRAM CIRCUIT DESCRIPTION INTRODUCTION 4.1. RFID MODULE 4.2. MICROCONTROLLER 4.3. MAX 232 4.4. LCD 4.5. KEIL SOFTWARE 4.6. PROTEUS

5.

COMPONENT DESCRIPTION 5.1. AT89C51 5.2. RFID MODULE 5.3. MAX 232 5.4.ISP PROGRAMMER

6. 7.

CODING BIBILOGRAPHY

ABSTRACT
RFID based Secured access system implemented on 8051 microcontroller . This is a very useful application of RFID (Radio-frequency identification) and is very commonly used in institutes, offices, homes and so on. An RFID system consists of a reader device and a transponder. A transponder or tag has a unique serial number which is identified by the reader. Here RFID has been interfaced with AT89C51 to provide secured access. The relevant messages are also displayed on a 16x2 LCD. RFID automated access for door controls to buildings, departments, rooms, secured closets (wiring, PBX, etc.) and cabinets is very cost effective and secure to use. Many people do not realize how easy it is to implement card access systems such as card access door or doors using RFID readers and RFID Cards or Keyfobs for Secured Access Control Management. You can even use smart readers for computer rooms and securing individual computers. In fact access based entrance and exits using access smart technology is rapidly becoming the way of the future for many businesses, government buildings, hospitals, museums and other establishments requiring secured but easy to control access solutions. Access based systems use either 125 kHz RFID or 13.56 MHz RFID readers, cards and keyfobs.

Features:
Low power requirement. Excellent characters appearance. Reliability. Lower cost. In our project we are implementing the RFID based secured access system by using microcontroller. The system communicates with an administrator PC via a serial communications link and HyperTerminal. RFID technology is based on the concept of magnetic coupling, which is the principle that current flowing in one circuit can induce current flow in another circuit through a magnetic field generated in the space between the circuits.

BLOCK DIAGRAM:

HARDWARE REQUIREMENTS: AT89C51 RFID MODULE MAX 232 16x2 LCD

SOFTWARE REQUIREMENTS: PROGRAMMING IN EMBEDDED C KEIL C COMPILER ISP PROGRAMMER PROTEUS

SCHEMATIC DIAGRAM

CIRCUIT DESCRIPTION
DESIGNING:
The main intension of this project is to design a RFID based Secured access system using 8051 microcontroller (AT89C51) . In order to fulfill this application there are few steps that has been performed i.e. 1) Designing the power supply for the entire circuitry. 2) Selection of microcontroller that suits our application. 3) Selection of LCD 4) Selection of MAX 232 5) Selection of RFID MODULE Complete studies of all the above points are useful to develop this project.

POWER SUPPLY SECTION:
In-order to work with any components basic requirement is power supply. In this section there is a requirement one voltage level i.e. 5V DC power supply. Now the aim is to design the power supply section which converts 230V AC in to 5V DC. Since 230V AC is too high to reduce it to directly 5V DC, therefore we need a stepdown transformer that reduces the line voltage to certain voltage that will help us to convert it in to a 5V DC. Considering the efficiency factor of the bridge rectifier, we came to a conclusion to choose a transformer, whose secondary voltage is 3 to 4 V higher than the required voltage i.e. 5V. For this application 0-9V transformers is used, since it is easily available in the market. The output of the transformer is 9V AC; it feed to rectifier that converts AC to pulsating DC. As we all know that there are 3 kind of rectifiers that is 1) half wave 2) Full wave and 3) Bridge rectifier Here we short listed to use...
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