As thefts are increasing day by day security is becoming a major concern nowadays. I wanted to design something to be able to secure any type of items that you would want to store. Many of us like to control each and every appliances of our home using touchpad, keypad or through Bluetooth. From controlling the room lights to controlling the door lock with your keypad, home automation has taken convenience to a whole new level. Instead of using mechanical switches, you can now continently control all the devices in your home from your fingertips.

This project demonstrates how to setup a simple DIY home automation using an Arduino. In this project, I make a door lock system with keypad using Arduino Uno. It will open the door only when the right password is entered and if the password is wrong then it will show a message INCORRECT! TRY AGAIN. Then you can control different color of LED. By pressing right password, the fan would be automatically on. It was an interesting project for me to learn. I simplified my code and it effectively runs. I got so many new ideas while making this project and it widens up my knowledge.

EXPANDED TECHNICAL DETAILS

Local Access Control Logic

This project focuses on high-security physical interaction for home automation systems.

• Matrix Keypad Scanning: Uses a 4x4 Membership Matrix Keypad. The Arduino rapidly scans the rows and columns to identify which button was pressed, using only 8 pins.
• Password Logic: The firmware compares the input string against a pre-set master code stored in the Arduino's EEPROM (memory that survives power loss).

Interactive Feedback

• Status Indicators: Accurate entries trigger a "Welcome" message on an I2C LCD and activate a Relay for a door lock. Invalid entries trigger a red LED and a warning tone from a Piezo Buzzer.