Design and Development of a Mobile Controlled Door Lock System

Abstract

Mobile controlled lock system refers to the automatic and electronic control of doors and some other appliances. With the development of modern technology, smart phones have become a necessity for everyone in this world. Smart phone affordability is also increasing every year. Android operating system (OS) of Google is the mostly used operating system in smart phones and tablets around the world. Controlling home door appliances by using an Android device gives the users convenience, security and safety. In this project, a Bluetooth-based home automatic door lock system has been designed and developed using Android device. This system includes an Android device (Smart phone or Tablet), a Bluetooth module, Arduino Uno R3 board, servo motor and various home appliances. A mechanical lock has been developed which is suitable for this project. The mechanical lock is attached to the door and interfaced with a driving servo motor. The servo motor is rotated clockwise and anticlockwise by the Arduino Uno controller. The Bluetooth module is also interfaced with the Arduino Uno board. The Bluetooth technology is used to establish communication between the Android device and Arduino board. Blueterm, an Android application, is used in android phone to lock and unlock the desired door. When the buttons of the App are pressed on, corresponding Bluetooth signals are sent from the Android device to the Bluetooth module which is connected to the Arduino. The Arduino finds out which signal has been sent and compares it to the predefined signals assigned for each appliance. The complete system has been developed and found completely functioning. The most interesting feature of this developed system is, only the owner can lock and unlock his door. Because there is a password for more security. If the password is correct only then, the door will be locked or unlocked.