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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A transponder or tag has a unique serial number which is identified by the reader. An intelligent LCD displays two lines, mixrocontroller characters per line, which is interfaced to the Is this code can be compiled in any c complier or any specific compiler is there?

As we know that there so many types of micro controller families that are available in the market.

We can download them from their Websites. It simply detects the presence and absence of an EAS transponder in the reader zone.

RFID based Secured access system using 8051 microcontroller (AT89C51)

As inputs, Port 1 pins that are externally being pulled low will source current IIL because of the internal pullups. The RFID tag is used as an identity for a particular user.

But you have given the project in detail. In-System Programming abbreviated ISP is the ability of some programmable logic devices, microcontrollers, and other programmable electronic chips to be programmed while installed in microcontrloler complete system, rather than requiring the chip to be programmed prior to installing it into the system.


For this application V transformers is used, since it is easily available in the market. A tag needs to receive the carrier signal, modify it in some way corresponding to the data on the card, and retransmit the modified response back to the reader.

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 use Bridge rectifier, because half wave rectifier has we less in efficiency. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. Log In Sign Up. An existing user can delete his record by pressing the same switch.

LCD interfacing with microcontroller Driver Section: Since V AC is too high to reduce it to directly 5V DC, therefore we need a step- down transformer that reduces the line voltage to certain voltage that will help us to convert it in to a 5V DC. When RS is high 1the data that is sent is a text data which should be displayed on the screen.

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

Arduino based GPS receiver. This control line is used to tell the LCD that eystem are sending it data. This serial code, consisting of 12 bytes, is received by the microcontroller.

Even though the efficiency of full wave and bridge rectifier are the same, since there is no requirement for any negative voltage for our application, we gone with bridge rectifier.

Thanks Baed Regard from Pradeep. By your this type of helping, you can develop many electronic engineers in India. If the ID is matched with this microconroller, the user is granted access though the system. Or you can modify the code to add IDs on run time and share here for the community. EA should be strapped to VCC for ssecurity program executions.


Use Keil uvision Software. Proteus is the embedded system simulation and developing platform developed by Britain Lab center Company, this software has the following characteristics: The free source code for the program is available in C. In order to fulfill this application there are few steps that has been performed i. Active transponders are capable of longer communication distance and can perform data collection tasks even when no reader is present.

When 1s are written to Port 3 pins they are pulled high by the internal pullups and can be used as inputs.

It can be erased and program to a maximum of times. It is very nice of you.

If password match gate will open otherwise LCD show Access denied and buzzer start beeping for sometime. Normally, the flash memory of an ATMEL microcontroller is programmed using a parallel interface, which consists of sending the data byte by byte using 8 independent lines for the data, and another bunch of lines for the address, the control word and clock input.

If the device is powered up without a reset, the latch initializes to a random value, and holds that value until reset is activated. This RFID is working at baud rate of bps.

Last modified: April 5, 2020