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In Electronics Access control system , we will control the door using password protection. In thisd project we will control  it using

microcontroller 89C051. we will use key matrix to enter data, if entered data will match with stored data in microcontrolller, then only it will allow the door to open , otherwise it will remain locked.


The main key in this project is coding  of password.we will use stepper motor to open the door , so that door will open step by step.


We will use LCD display to show the entered password.


It will also show the entered password match with stored password, if the password will match then it will show access successful, otherwise it will show denied. LCD dislay will also show clock. if entered password three times denied, then it will move the programmer in continuous loop & will not allow to entered password.


When signal match with the stored password then microcontroller will give its output to stepper motor  circuit through port3. it will give supply to stepper motor & rx pulses from microcontroller .

Then dooor will open.






What is Open SYSTEM?

   An open system is the normal desktop computer where you can use it for any tasks. If you want to process text documents you can install Ms-word if you want to send mail you can use outlook express and counts on.

What is Embedded System ?

 An embedded system is the system where you can use it for a specific task.



A microcontroller (often abbreviated MCU) is a single computer chip that executes a user program, normally for the purpose of controlling some device hence the name microcontroller.

 A microcontroller is differed from microprocessor in many ways. Basically microprocessors are the devices which can process huge amount of data. A microprocessor can’t do anything on it own. Even to light a led a microprocessor needs minimum of a ROM, RAM, Latch, Address decoders, PORT controllers. But for the same application if you take a microcontroller you barely need a crystal and some capacitors.

 So from this you can understand how versatile the microcontroller is.



Different microcontrollers in market



Intel 8051

Intel 8051 is CISC architecture which is easy to program in assembly language and also has a good support for High level languages.

The memory of the microcontroller can be extended up to 64k.

This microcontroller is one of the easiest microcontrollers to learn.

The 8051 microcontroller is in the field for more than 20 years. There are lots of books and study materials are readily available for 8051.


ATMEL 89s51





The AT89S51 is a low-power, high-performance CMOS 8-bit microcontroller with 4K bytes of In-System Programmable Flash memory. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the indus-try-standard 80C51 instruction set and pinout. The on-chip Flash allows the program memory to be reprogrammed in-system or by a conventional nonvolatile memory pro-grammer. By combining a versatile 8-bit CPU with In-System Programmable Flash on a monolithic chip, the Atmel AT89S51 is a powerful

microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.

Component List:-


Microcontroller 89C051

LCD display 16*2 matrix

Keys matrix

Stepper Motor

Wood or ply

Crystal 3.58Mhz

Resistance 220 ohm

Capacitor 0.01 micro farad

Keyboard general or push to on Button

DIP switches

Connecting wires

Microcontroller programming kit

12v supply

copper clad board

Ferric chloride




8051 programmer universal kit

CRO 20 Mhz

Digital multimeter





Keil for Programming


OrCAD for PCB designing


Proteus 7.6 Simulation





Features :-


LCD display- entered password show on LCD

Programmable- flexible- programming can be change , so this project is flexible

Component easily available

Low cost

General use for security system





1.     Security System of offices,lockers,rooms

2.     For cranes – we can make cranes with same logic

3.     For lift control- with change in programming we can change in to lift control circuit