Arduino Password Unlock Door Security System

Hello! In this Instructables guide I will show you how to make your own password unlock door system by using the Arduino uno board. I made my own circuit by using the ATmega328 micro controller but this is an optional step. In this guide I will help you to make it easily on breadboard by using the Arduino uno board, and I will give you some extra tips on how you can make your own Arduino-based custom circuit. By using this system you will be able to unlock a door for 5 seconds. After 5 seconds the electrical door opener will be automatically be locked. You can unlock it by typing the correct password and pressing the ‘*’ button. If you want to change the current password, you can do it by pressing the ‘A’ button and if you want to skip or abord an operation you can do it by pressing the ‘#’ button. It also has a buzzer for making various tones during operation.”

Link