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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Crystal circuit is used for the microcontroller for timing pluses.


When lock bit 1 is programmed, the logic level at the EA pin is sampled and latched during reset. Get Our Weekly Newsletter! The main screen view of the program is shown in fig below. This is due to following reasons: External pullups are microcontrolller during program verification. RFID technology is based on the concept of magnetic coupling, which is the principle that current flowing in one circuit can induce current flow in another circuit through a magnetic field generated in the space between the circuits.

Microcontrollers as the name suggests are small controllers. Only one instruction “Get LCD status” is a read command. Port Pin Alternate Functions P3.


Idle Mode In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active. There are two important registers inside the LCD.

The idle mode can be terminated by any enabled interrupt or by a hardware reset. There are three types of RFID tags: Reset circuit is used to reset the microcontroller.

Interface GPS with Arduino. LCD Liquid Crystal Display screen is an electronic display module and find a wide range of applications.

Or you can modify the code to add IDs on run time and share here for the community. Even though the efficiency of full wave and bridge rectifier are the same, since cotnrol is no requirement contorl any negative voltage for our application, we gone with bridge rectifier. For example, a new user can register himself with the system.

However, the size of code for these shareware versions is limited and we have to consider which assembler is suitable for our application. Many members of the Maxim based microcontroller family support in-system programming via a commonly available RS serial interface.

Use Keil uvision Software. Skip to main content. Arduino based GPS receiver. So some time people like me are blinking. Note when you select the target device from the Device Database all-special options are set automatically. Systme RFID based secured access system also has many additional features.


In this application, it uses strong internal pullups when emitting 1s. The RFID tag is used as an identity for a particular user. 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.

XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit.

RFID based Secured access system using 8051 microcontroller (AT89C51)

The primary advantage of this feature is that it allows manufacturers of electronic devices to integrate programming and testing into a single production phase, rather than requiring a separate programming stage prior to assembling the system.

It should be noted that when idle is terminated by a hard ware reset, the device normally ckntrol program execution, from where it left off, up to two machine cycles before the internal reset algorithm takes control.

Program Memory Lock Bits On the chip are three lock bits which can be left unprogrammed U or can be programmed P to obtain the additional features.