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. Microcontroller other end is connected to DC gear motor. Microcontroller allows input pulse to motor for valid cards only. For invalid cards it won’t allow any digital inputs for motor. It gives beep sound for invalid cards. It is useful in shopping malls, movie theaters, offices ….etc., we can connect doors, gates to DC gear motor. So that it provides security for different needs.
Microcontroller shows status messages on 16X2 LCDdisplay. It gives beep sound through buzzer for invalid cards. The gate will be operated by DC gear motor. This DC gear motor driven through L293D IC. Gate will be close within 30 sec after validation card occur.
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
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:
- Shopping malls
- Auditoriums