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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There are two important registers inside the LCD. The 74LS pin configuration, logic diagram, connection and function table is on the below.

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 syste Bridge rectifier, because half wave rectifier has we less in efficiency. When an RFID tag comes in this range, the reader detects it and sends a unique code of the tag serially.

RFID based Secured access system using 8051 microcontroller (AT89C51)

You can even use smart readers for computer rooms and securing individual computers. Log In Sign Up. Use Keil uvision Software. Choosing Battery for Robots.

RFID based Security System using microcontroller (AT89C51): Circuit & C Code

Among its major features are its lightweight construction, its portability, and its ability to be produced in much larger screen sizes than are practical for the construction of cathode ray tube CRT display technology.


In modern passive RFID devices, the tag consists of a small integrated circuit that performs the modulation and an antenna.

It encapsulates the following components: On the other hand, if the reader is mobile when the reader reads tags, it is called mobile RFID. Following are the main features of this software: Port 3 also serves the functions of various special features of the AT89C51 as listed below: The RFID tag is used as an identity for a particular user. This high-density System-in-Package SiP integrates controller, power switches, and support components.

If the reader reads tags in a stationary position, it is called fixed RFID. Pl send your mail id if u like to have contact to my mail id []. In passive RFID, there are two major components: An intelligent LCD displays two lines, 20 characters per line, which is interfaced to the The reset should not be activated before VCC is restored to its normal operating level and must be held active long enough to allow the oscillator to restart and stabilize.

In order to fulfill our application basic that is AT89C51 controller is enough. This RFID is working at baud rate of bps. A transponder or tag has a unique serial number which is identified by the reader.

This is the software that will take the HEX file generated by whatever compiler you are using, and send it – with respect to the very specific ISP transfer protocol – to the microcontroller. For this application V transformers is used, since it is easily available in the market.


Default memory model settings are optimal for most. Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.

Keypad row are connected at P0. In this section there is a requirement one voltage level i. A registered user can also withdraw his entry from the system.

RFID Based Security System using Microcontroller

Here you can see the tutorial: For example the remote control you are using probably has microcontrollers inside that do decoding and other controlling functions. XTAL2 Output from the inverting oscillator amplifier. After RST is set high, the Programming Enable instruction needs to be executed first before other operations can be executed.


This programmer was designed in view of to be flexible, economical and easy to built, the programmer hardware uses the standard TTL series parts and no special components are used. The new record is stored by the microcontroller to grant future access.