1. Password Based Door Lock System using 8051 Microcontroller
Abdullah Umar Nasib
, Section 02
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

2. Topics to be covered... Basic Concept Components
Pin Diagram & Circuit Design
Door Lock System Algorithm
Advantages
Drawbacks
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

3. Basic Concept … Main component 8051 microcontroller
Will have predefined password
Check the given password in 4x3 matrix keypad
Correct password will open the lock otherwise locked
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

4. Pin Diagram & Circuit Design…
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

5. Components… A 8051 microcontroller 8051 programming board
Programming cable
DC battery or 12V,1A adaptor
4×3 matrix keypad
16×2 LCD & 5V Relay
Connecting wires
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
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

6. Components (Software)…
Keil compiler
Flash magic
Proteus
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

7. Electronic Code Lock System Circuit Design
Reset Circuit Design: Ensuring the power supply does not fall below 1.2V and reset pulse >100ms.
Oscillator Circuit Design: Used to provide signal from external clock to microcontroller. Uses two capacitors ranging pF.
Compilation of microcontroller code : kiel Uvision is used to write code in C. A hex file is created after after code compilation. Then circuit is designed with proteus. Then added to IC.
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

8. System Algorithm… PORT1 to LCD data pins
Control pins to P3.5, P3.6 and P3.7
PORT2 to keypad.
P3.0 to Door motor.
Display enter password on LCD.
Read password from the user
Compare the entered password with stored password.
If password is correct, "Door is opened” on LCD
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

9. Advantages… Security Less Power Consumptions
Uses of commonly available components
Simple and Easy implementation
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

10. Limitations… Low range circuit Not remotely operated
Risk of forgetting password
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

11. Thank you…
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University

12. Any Queries or Suggestions?
Password Based Door Lock System Using 8051 MicroController || Presented to Dr. Jia Uddin || BRAC University