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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Many members of the Maxim based microcontroller family support in-system programming via a commonly available RS serial interface. LCD Liquid Crystal Display screen is an electronic display module and find a wide range of applications.

Contro, a reprogramming sequence can occur, a Chip Erase operation is required. Port Pin Alternate Functions P3.


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. The benefit of passive RFID is that it requires no internal power source; the circuit on the tag is actually powered by the carrier signal.

The RFID tag is used as an identity for a particular user. Port 2 also receives the high-order address bits and some control signals during Flash programming and verification. As we know that there miceocontroller many types of micro controller families that are acvess in the market. After loading the hex file ,the no.


The programmer is interfaced with the PC parallel port and there is no special requirement for the PC parallel port, so the older computers can also be used with this programmer.

The serial code of the tag aaccess identified by the reader module and is sent to AT89C51 for checking. AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family. The main screen view of the program is shown in fig below.

If the device is powered up without a reset, the latch initializes to a random value, and holds that value until reset is activated.

RFID based Secured access system using 8051 microcontroller (AT89C51)

You can even use smart readers for computer rooms and securing individual computers. When RS is low 0the data is to be treated as a command or special instruction such as clear screen, position cursor, etc. 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.

However, the size of code for these shareware versions is limited and we have to consider which assembler is suitable for our application. As inputs, Port 3 pins that are externally being pulled low will source current IIL because of the pullups. This code is treated as an ID for the user and is stored as an array in the microcontroller.

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. 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.


U2 is LD motor driver IC.

There are two important registers inside the LCD. This allows a very definitive reading area for when tags go in and out of the interrogation zone.

This makes it difficult to establish a direct link between them to communicate with each other.

For 20 pin devices a simple interface adapter is required. SPI Module of Arduino.

In this mode P0 has internal pullups. We can download them from their Websites. EA should be strapped to VCC for internal program executions. The idle mode can be terminated by any enabled interrupt or by a hardware reset. After RST is set high, the Programming Enable instruction needs to be executed first before other operations microcontrroller be executed. If possible hex file. Program Memory Lock Bits On sstem chip are three lock bits which can be left unprogrammed U or can be programmed P to obtain the additional features.

But main technical supports are from NET, like you people.

ISP is performed using only 4 lines, and literally, data is transferred through 2 lines only, as in a I2C interface, where data is shifted in bit by bit though MOSI line, with a clock cycle between each bit and the next on the SCK line.