This document describes a smart door lock system that uses Bluetooth technology. The system automatically unlocks the door when it detects an authorized Bluetooth device nearby without needing to use a key. It uses a microcontroller to verify the Bluetooth signal and only unlocks for approved users. The system aims to enhance home security while allowing convenient access through a user's mobile phone. It could be used to control home appliances and doors/gates through a smartphone app for added accessibility and security features.