How to make a Bluetooth Control Home Automation

In this tutorial we will build a home automation device that will help you to control your home device like light,fan,TV etc using an arduino and a Bluetooth module.this one is very easy and you can build it within a hour.I can control up to 4 home appliance using this divice and a smart phone.So let's a look at the list of material and tools you'll need.

Material List:

Arduino uno
4-chhanel Relay module
Bluetooth Module (HC-5)
Jumper wire
Bulb holder
5v power supply
Soldering kits
glue gun
Android smart phone
Arduino Software(you can download it from here.)
A android app (you can download it from here)

The Circuit:

Arduino Code:

void setup( )
{
Serial.begin(9600);
pinMode(2,OUTPUT);
pinMode(3,OUTPUT);
pinMode(4,OUTPUT);
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7,OUTPUT);
digitalWrite(2, HIGH);
digitalWrite(3, HIGH);
digitalWrite(4, HIGH);
digitalWrite(5, HIGH);
}

void loop( )
{

if(Serial.available( ))
{ char x=Serial.read();
if(x=='1')
{
digitalWrite(2,LOW);
}
else if(x=='2')
{
digitalWrite(3,LOW);
}
else if(x=='3')
{
digitalWrite(4,LOW);
}
else if(x=='4')
{
digitalWrite(5,LOW);
}
else if(x=='5')
{
digitalWrite(2,HIGH);
}
else if(x=='6')
{
digitalWrite(3,HIGH);
}
else if(x=='7')
{
digitalWrite(4,HIGH);

}
else if(x=='8')
{
digitalWrite(5,HIGH);

}
else
{ Serial.write("send data ");
}
}
}

Now install the android app on your smart phone.Then you have to pair the bluetooth module to your android device before you could use it in the app.

Open your device's bluetooth settings and search for new devices, make sure the led on HC05 module is blinking continuously (Pairing Mode).
Select HC 05 ( or you'll see an address ending with "C" as shown in the picture.)
Enter the PIN "1234" and press OK.
Open the "Bluetooth Controller" Select "HC 05" from the list.
Use the respective switches to turn ON/OFF the relays 1,2,3,4.

Assembling the Components Like below Picture: