What is it?

This project represents a usable door lock system built with Arduino Uno and LEGO. To use it you need an already registered ID card or chip that will provide access to the locking mechanism.

I made up the LEGO design by myself, tried various different ways and chose this one as it is the most compatible with the Arduino parts.

How does it work?

When a card or chip is placed next to the RFID reader the Arduino code will check whether its UID is registered. If it is registered, access is granted and the blue LED will light up along with a sound from the buzzer. After that the Servo motor rotates along with the LEGO gear wheel, which therefore moves the door lock and it unlocks or locks itself, depending on its previous state.

If an unregistered card or chip is read from the reader, the access will be denied and the red LED will light up with a different sound from the buzzer, indicating that the door lock will not move.

Future plans:

I made this project for my Robotics class and it is still a prototype. I plan on making it compact and usable without power from a laptop so it can be installed on a real door. After that I will try to modify it using an ESP8266 board so I can use it as an IoT device through a web server.

Made with passion :)