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ABSTRACT: Home Automation using Bluetooth
The project aim is to design a device controlling system through android smart phone. The devices can be controlled wirelessly (Bluetooth communication) through the android smart phone.
Android is a software stack for mobile devices that includes an operating system, middleware and key applications. Android boasts a healthy array of connectivity options, including Wi-Fi, Bluetooth, and wireless data over a cellular connection (for example, GPRS, EDGE (Enhanced Data rates for GSM Evolution) and 3G). Android provides access to a wide range of useful libraries and tools that can be used to build rich applications.
Bluetooth is an open standard specification for a radio frequency (RF)-based, short-range connectivity technology that promises to change the face of computing and wireless communication. It is designed to be an inexpensive, wireless networking system for all classes of portable devices, such as laptops, PDAs (personal digital assistants), and mobile phones.
The input and output port of the controller are interfaced with different input and output modules depending on the requirements. In other words, microcontroller acts as a communication medium for all the modules involved in the project. The controlling device of the whole system is an Arduino UNO Microcontroller. Bluetooth module, Relay with AC bulb and transistor with DC motor are interfaced to the Microcontroller. The data received by the Bluetooth module from Android smart phone is fed as input to the controller. The controller acts accordingly on the Relay/transistor to switching ON/OFF connected electrical appliances. In achieving the task, the controller is loaded with a program written using Embedded ‘C’ language.

The main objectives of the project are:
1. Operating the loads through Bluetooth mobile app by using mobile phone.
2. Bluetooth wireless transmission.
3. Using Arduino UNO to achieve this task.

The major building blocks of the project are:
 Regulated power supply with voltage regulator.
 HC-05 Bluetooth module.
 Arduino UNO Microcontroller.
 Relay with AC bulb
 Transistor with DC fan.
 Android mobile.

Software’s used:
1. Arduino IDE for compiling and dumping code into controller
2. Express SCH for Circuit design.