The new generation is now full of smart people using smart technology. Smart devices makes life of a person easy and updated. There are hundreds of goods available today that allow us have power over the devices without human intervention, either by remote control; or even by voice command. So in ”Smart Lock” an ARM7 controller and Bluetooth module from the mobile device is used for smart lock system. The proposed system describes improvement of a security system that is integrated with an Android mobile phone device using Bluetooth as a wireless connection protocol. Android OS is currently the go ahead on mobile market share while Symbian OS was already discontinued. This proposed system allows a user to lock or unlock a door a short range from the door. The application was designed to allow the user to also check the status of the door. The mobile device requires a password to increase the security of the system. The hardware on the door uses a microcontroller to control a linear actuator that acts as the locking mechanism. The Bluetooth protocol was chosen as a communication method because it is already integrated into many Android devices and is secured through the protocol itself. It also fits well into the design requirements of the project for a short range, wireless connection method. The system is designed such that the motion of the user will be captured from the camera and the user will be detected and then only he will be given a key to lock or unlock. The system will be designed for security purposes. It will work as when bell rings at the door, it will act as a trigger to the camera and the camera will capture the video of the person standing in front of the door, that will be shown to the registered user who is away from home and then he will identify the person and can share the key with that person for a particular time period. This increases great security for homes and that too without human intervention.