89C51 MICROCONTROLLER BASED SECURITY ACCESS CONTROL SYSTEM PDF

RFID technology is used for accessing data from a uniquely identify RFID card or tag by combining the radio frequency and microchip technologies i. With the help of RFID technology we can create smart systems that can be used personnel identification, product monitoring, individual or organisation security, transportation, maintenance of inventory and supply chain tracking. The communication between the Reader and Card is using Radio Technology whereas the communication between RFID Reader and the host device like a microcontroller is through serial protocol. Active RFID Tags are battery powered and they have an electronically erasable and programmable memory. The coil acts as an antenna as well as the source of power through induction. The microchip is a read only type memory and the user can only read the data that already stored by the manufacturer.

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Bread board on which circuit is designing reset circuitry capacitor 10uf and resistor 8. Connect port 3 pin no 5 to rs register select pin of lcd. Attach your lock to port 3 pin no 0. The lock designing is explained below. Other connections are for driving the microcontroller connect crystal with pins 18 and Ground pin Apply 5 volts to pins 40 and Attach your reset circuitry to pin 9. The lock system is some thing challenging but it is not as much hard to design as it look likes.

Below is the circuit that describes the lock system. A small dc motor is attached to the transistor at the source. Dc motor is operating on 9 volts. The transistor gate is connected to port 3 pin 0.

So when the user inputs the correct password the transistor becomes on and our dc motor rotates and move back lock needle, which opens the lock. To lock the door again manually pull up the lock needle. The code is simple and easy to understand it is written in c language. First of all the necessary header file reg This header file must be included in every project made using keil as the software tool to write the code.

Then the keypad rows and coulombs are declared. All the upper described pins are declared individually because they are used in our code individually. Data pins for lcd are not defined because whole port1 is dedicated for data pins of lcd, and data is send parallel in 8-bit form. Then some character arrays are defined. The lock controlling pin is also defined as lock at port3 pin 0.

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Bread board on which circuit is designing reset circuitry capacitor 10uf and resistor 8. Connect port 3 pin no 5 to rs register select pin of lcd. Attach your lock to port 3 pin no 0. The lock designing is explained below. Other connections are for driving the microcontroller connect crystal with pins 18 and

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Automatic door lock system using 8051(89c51,89c52) microcontroller

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89C51 Security Access Control System

Here, an AT89C52 Microcontroller is used and it is an 8-bit controller. In order to provide regulated 5V DC voltage to the controller we need to use power supply circuit. In other words to ensure the supply voltage does not falls below the threshold level of 1. To ensure smooth operation, we need to connect two ceramic capacitors in the range of 30pF to 40pF. This crystal oscillator is connected between pin 18 and 19 of the microcontroller.

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