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1. REMOTE CONTROLLED HOME AUTOMATION USING
BLUETOOTH
DESCRIPTION:
Bluetooth is a wireless module which transfers data from dongle to blue tooth
modem and modem to Bluetooth dongle. This module enables you to transmit & receive
wireless data in serial format. It is an advanced technology which can is widely used
now-a-days in mobile data sharing and within network communications like modem to
printer, etc.. Allowing transparent two way data communication. In our project we can
simply use it for transmitting wireless serial data to establish connection between MCU
or embedded project and PC.
Our project is designed to control home appliances remotely through Bluetooth
wireless data transfer. Many home appliances (Fan, A.C, T.v ………..etc.,) work on A.C
power supply. Microcontroller cannot directly drive A.C loads, so we are using a relay
drive for A.C control. Here we control relays through micro controller which in turn gets
input from PC hyper terminal or .net c# application or from android device. Bluetooth
modem is connected to microcontroller serially with 9600 baud rate. The range of
Bluetooth modem is 10 meters with frequency 2.4 GHz. Blue tooth Transmit power is
4dBm and sensitivity is 84 dBm. Here in our project Bluetooth modem acts as receiver
and Bluetooth dongle acts as transmitter which is connected to USB port of the PC. In
this way we can control home appliances from PC using Bluetooth interface. However
we can also communicate with the Bluetooth modem through a mobile phone, the mobile
phones needs a special application designed for it, and which may or may not be
compatible with the modems available. Instead we go for Bluetooth modems and dongle
in our project
Here we use an 8051 microcontroller with 5V DC Power supply. Serial
(UART) protocol is primary concern here. The heart of this project is Bluetooth modem

2. which works on serial (UART) protocol. Micro controller is interfaced with relays which
are triggered through transistor switching.
TECHNICAL SPECIFICATIONS:
HARDWARE
Micro controller : AT89S52
Crystal : 11.0592 MHz
LED : 5mm Red LED
Blue Tooth Modem
12V relays (Electro mechanical type)
Basic GPIOs
POWER SUPPLY
Transformer : 12V step down
Filter : 1000uf/25V
Voltage Regulator : 7805 / 7812
SOFTWARE
Software tools used
Keil IDE
Proteus VSM
UC flash
APPLICATIONS
 Home appliances
 Industrials

3. BLOCK DIAGRAM:
POWER SUPPLY BLOCK DIAGRAM
8
0
5
1
8
0
5
1
Blue
Tooth
Modem
Blue
Tooth
Modem
Max-232Max-232
Power
Supply
Power
Supply
Step down
Transformer
Filter Regulator OutputBridge
Rectifier
Relay 2Relay 2 Device 2Device 2
Relay 1Relay 1 Device1Device1
Blue
Tooth
Dongle
Blue
Tooth
Dongle
PC C# (.net)
Application /
Android app
PC C# (.net)
Application /
Android app