ABSTRACT:

Radio Frequency Identification (RFID) Card Readers provide a low-cost solution to read passive RFID transponder tags up to 2 inches away. The RFID Card Readers can be used in a wide variety of hobbyist and commercial applications, including access control, automatic identification, robotics navigation, inventory tracking, payment systems, and car immobilization. The RFID card reader read the RFID tag in range and outputs unique identification code of the RFID tag. The RFID reader can interface to microcontroller or PC and the unique identification code of the RFID tag received by the RFID reader is send through serial at baud rate of 9600.

Here RFID reader is connected to microcontroller through serially. It reads the card information. Each card is assign to particular user and each card acting as a tollgate ticket. This card is valid for 10 times and every time use has to swipe card for allowing through tollgate. If card is valid toll gate is opened otherwise it can’t open. After open gate microcontroller wait one minute and close the gate. This card valid 10 times after that use has to purchase new card or recharge through controller.

 Every access deduct amount or validation points from card The deducted amount will be stored in EEPROM. Every time microcontroller reads   data from EEPROM and process for next validation. If validation is completed it gives beep sound through buzzer. Microcontroller shows status messages on 16X2 LCD.

The gate will be operated by DC gear motor. This DC gear motor driven through L293D ic.

In this project 7805 is a regulator and it avoids noise spikes in power supply. RFID modem is connected microcontroller through serial port. These RFID modem works under 9600 or 4800 baud rates. 16X2 LCD connected to microcontroller through digital I/O lines.

TECHNICAL SPECIFICATIONS:

HARDWARE:

Micro controller         :           AT89S52

Crystal                        :           11.0592 MHz

LED                            :           5mm Red LED

Serial Driver               :           Max 232

LCD                            :           HD44780 

EEPROM                    :           AT24c04

Motor Driver               :           L293D

RFID modem, Buzzer    

DC gear motor            :           10 r p m

Power supply

Transformer                :           12V step down  

Filter                           :           1000uf/25V

Voltage Regulator      :           7805

SOFTWARE:

Keil micro vision

Proteus

UC flash

APPLICATIONS:

• Toll gate system
• Check posts