This document describes a password-based door locking system using an 8051 microcontroller. The system includes a keypad to enter a password, which is checked against a stored password. If the passwords match, the gate opens. Otherwise, an alarm is activated. The hardware requirements include an 8051 microcontroller, keypad, LCD, relay, motor, resistors, capacitors, crystal oscillator, voltage regulator, and momentary switch. The software includes Keil compiler, Flash Magic, and Proteus. A circuit diagram is provided. Advantages are security, low power consumption, and simple design using common components. Applications include home security and controlling access to secured areas.

1. PASSWORD BASED DOOR LOCKING
SYSTEM USING 8051 MICROCONTROLLER
PRESENTED BY……..
 PRASHANT
MANGLESHWAR
MRADUL
NARENDRA
EC-B 4th YEAR
MENTOR:
SHIV SIR

2. CONTENTS
 INTRODUCTION
 HARDWARE REQUIRED
 SOFTWARE REQUIRED
 CIRCUIT DIAGRAM
 STEPPER MOTOR
 CRYSTAL OSCILLATOR
 VOLTAGE REGULATOR
 MOMENTARY SWITCH
 LCD
 ADVANTAGES
 APPLICATIONS

3. INTRODUCTION
 A microcontroller based Door locker is an acecess
control system that allows only authorized persons
to access a restricted area.
 The system has a Keypad by which the password
can be entered through it. When the entered
password equals with the password stored in the
memory then the gate gets open. If we entered a
wrong password then the Alarm is switched on.

4. HARDWARE REQUIREMENTS:
AT89C51 CONTROLLER
8051 PROGRAMMING BOARD
PROGRAMMING CABLE
DC BATTERY OR 12V,1A ADAPTOR
4×3 MATRIX KEYPAD
16×2 LCD
5V RELAY
DC MOTOR
BC 547 TRANSISTOR
10K, 330 Ω RESISTOR (1/4 WATT)
10UF ELECTROLYTIC CAPACITOR
33PF CAPACITORS – 2
12MHZ CRYSTAL
POT 10K (1/4 WATT) – 1
CONNECTING WIRES

5. Software Requirements:
 Keil compiler
 Flash magic
 Proteus

6. CIRCUIT DIAGRAM-

7. STEPPER MOTOR
A stepper motor or step motor or stepping motor is a
brushless DC electric motor that divides a full rotation
into a number of equal steps. The motor's position can
then be commanded to move and hold at one of these
steps without any feedback sensor.

8. CRYSTAL OSCILLATOR
A crystal oscillator is an electronic oscillator circuit that
uses the mechanical resonance of a vibrating crystal of
piezoelectric material to create an electrical signal with a
very precise frequency.

9. VOLTAGE REGULATOR
 A voltage regulator is designed to automatically
maintain a constant voltage level.
 Depending on the design, it may be used to
regulate one or more AC or DC voltages.

10. MOMENTARY SWITCH
 In electrical engineering, a switch is an electrical
component that can break an electrical circuit,
interrupting the current or diverting it from one conductor
to another.
 The mechanism of a switch may be operated directly by
a human operator to control a circuit.

11. LCD
 A liquid-crystal display (LCD) is a flat panel display,
electronic visual display, or video display that uses
the light modulating properties of liquid crystals.
Liquid crystals do not emit light directly.

12. Advantages:
 This project provides security
 Power consumption is less
 Used commonly available components
 Project is simple and easy

13. Applications:
 This simple circuit can be used at residential places
to ensure better safety.
 It can be used at organizations to ensure
authorized access to highly secured places.
 With a slight modification this Project can be used
to control the switching of loads through password

14. Thank You