Keywords. RFID, System security, embedded system, 89C51 Microcontroller, Supply Chain . Fingerprint based access control system is implemented by using. RFID based access control system using microcontroller (AT89C51). This article explain the complete project with circuit diagram and C source code. Abstract: The microcontroller Based Security System with Intruder Position . Access Control Gates: Make it hard for the intruder to even get on your property, .. The AT89C51 is a low power, high performance cmos 8-bit.

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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 conttrol consists of a reader device and a transponder. A transponder or tag has a unique serial number which is identified by the reader.

The relevant messages are also displayed on a 16×2 LCD. The free source code for the program is available in C. There is a coil inside the RFID tag and when it is influenced by magnetic field, it sends an identity code to a device for further processing.

The RFID tag is used as an identity for a particular user. If the identity serial number of the tag of the user is matched with the one already systemm in this system, he gets immediate access through it.


This RFID based secured access system also has many additional features.


For example, a new user can register himself with the system. A registered user can also withdraw his entry from the system. These features can be accessed by pressing a tactile switch connected to the microcontroller. In beginning, the user is prompted to scan his tag or ID.

The serial code of the tag is identified by the reader module and is sent to AT89C51 for checking. If the ID is matched by the microcontroller, the user gets the access. A new user needs to press the switch to register after which his identity is verified twice with RFID tag. The new record is stored by the microcontroller to grant future access.

An existing user can delete his record by pressing the same switch. Again the verification is carried 89c1 and the user is deleted if the IDs match.

RFID based Secured access system using 8051 microcontroller (AT89C51)

When an Microcontrolller tag comes in this range, the reader detects it and sends a unique code of the tag serially. This serial code, consisting of 12 bytes, is received by the microcontroller. This code is treated as an ID for the user and is stored as an array in the microcontroller.


If the ID is matched with this code, the user is granted access though the system. For more details on working and connections of the circuit, refer RFID interfacing through serial interrupt. LCD Liquid Crystal Display screen is an electronic display module and find a wide baxed of applications.

A 16×2 LCD display is very basic module and is very commonly used in various devices and circuits.

RFID Door Access Control System using Microcontroller-ECE Project

This high-density System-in-Package SiP integrates controller, power switches, and support components. Skip to main content. This Code is only visible to Registered users. Interface GPS with Arduino. Interface SD Card with Arduino.

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