RFID

RFID is a tracking technology used to identify and authenticate tags that are applied to any product, individual or animal. Radio frequency Identification and Detection is a general term used for technologies that make use of radio waves in order to identify objects and people.

Purpose of Radio frequency Identification and Detection system is to facilitate data transmission through the portable device known as tag that is read with the help of RFID reader; and process it as per the needs of an application. Information transmitted with the help of tag offers location or identification along with other specifics of product tagged – purchase date, color, and price. Typical RFID tag includes microchip with radio antenna, mounted on substrate.

The RFID tags are configured to respond and receive signals from an RFID transceiver. This allows tags to be read from a distance, unlike other forms of authentication technology. The RFID system has gained wide acceptance in businesses, and is gradually replacing the barcode system. 

Projects using RFID & 8051 Microcontroller

RFID Interfacing

Interfacing RFID using Serial Interrupt

RFID based Toll Plaza

RFID Based Secured Access System

Projects using RFID & AVR Microcontroller

Interface RFID with AVR

Interface RFID with AVR using Interrupts

RFID based Toll Plaza

Electronic/automated toll collection systems are very popular these days. They do not require manual collection and operation of toll barriers. The details about the vehicles and payment are stored in an RFID based system.

This article explains the working of a simple toll plaza system interfaced with RFID. Each user holds a unique ID for his vehicle. When the user scans his tag while passing through the plaza, a certain amount is deducted from his account. A user may also recharge his account in case of insufficient balance. The project has been developed by interfacing RFID with AT89C51 Microcontroller. The relevant messages are also displayed on a 16x2 LCD. The free source code for the program is available in C.
also see these tutorials

RFID

8051

Microcontroller

Microcontroller Projects