3.1.6 Password Lock

Introduction

In this exciting security project, you’ll build your own digital password lock system just like the ones used in safes, doors, and secure areas! Using a keypad for input and an LCD screen for feedback, you’ll create a system that only unlocks when the correct password is entered.

How your password lock works: 🔢 LCD Display: Shows prompts and guides you through the password entry process ⌨️ Keypad Input: Type your secret password using the number pad ✅ Security Check: System verifies if your password is correct and displays “Correct” for success

Expansion possibilities: This project is perfect for adding more security features like: • 🔊 Buzzer alerts: Beep for wrong passwords or successful entry • 💡 LED indicators: Green for correct, red for wrong password • 🚨 Alarm system: Sound alert after multiple failed attempts

Components

Connect

T-Board Name	physical	wiringPi	BCM
GPIO18	Pin 12	1	18
GPIO23	Pin 16	4	23
GPIO24	Pin 18	5	24
GPIO25	Pin 22	6	25
GPIO17	Pin 11	0	17
GPIO27	Pin 13	2	27
GPIO22	Pin 15	3	22
SPIMOSI	Pin 19	12	10
SDA1	Pin 3
SCL1	Pin 5

Code

For C Language User

Go to the code folder compile and run.

cd ~/super-starter-kit-for-raspberry-pi/c/3.1.6/

gcc 3.1.6_PasswordLock.cpp -lwiringPi

sudo ./a.out

Tip

Want to explore the security code? Use nano 3.1.6_PasswordLock.cpp or nano 3.1.6_PasswordLock.py to see how password verification and user interface work together!

For Python Language User

cd ~/super-starter-kit-for-raspberry-pi/python

python 3.1.6_PasswordLock.py