The document describes a voice-based home automation system using an Arduino board. An Android app is used to give voice commands which are sent over Bluetooth to the Arduino board connected to devices like lights and fans. The Arduino code uses if-else statements to control the devices based on the incoming voice command. The system allows wireless control of home appliances and has potential for future development like using Zigbee wireless technology and controlling actual AC appliances with relays.

1. VOICE BASED HOME AUTOMATION
Department of Electronics and Communication
5th
Semester
‘A’ Section
By
BHARATR. HEGDE - 1DS13EC037
BASAVRAJMOOLI - 1DS13EC036
SUMUKHATHREY - 1DS13EC035

2. INTRODUCTION :
The Internet of Things (IoT) is the network of physical
objects or "things" embedded with electronics, software, sensors,
and network connectivity, which enables these objects to collect and
exchange data. IoT allows objects to be sensed and controlled remotely
across existing network infrastructure, creating opportunities for more
direct integration between the physical world and computer-based
systems, and resulting in improved efficiency, accuracy and economic
benefit. Home automation is one of the major areas where IoT can have a
stronghold.
In the recent years, the Home automation system has
seen a rapid change due to introduction of various wireless technologies.
The wireless home automation system is an integrated system to
facilitate elderly and disabled people with an easy-to-use home
automation system that can be fully operated based on speech commands.
The system is portable and constructed in a way that is easy to install,
configure, run, and maintain.
A typical wireless home automation system allows one to
control house hold appliances from a centralized control unit which is
wireless. These appliances usually have to be specially designed to be
compatible with each other and with the control unit for most
commercially available home automation systems. The project
demonstrates a system that can be integrated as a single portable unit
and allows one to wirelessly control lights, fans, air conditioners,
television sets, security cameras, electronic doors, computer systems,
audio/visual equipment’s etc. and turn on or off any appliance that is
plugged into a wall outlet, get the status of different sensors and take
decision accordingly.

3. AIM : To makea prototypeof a voice based home automation system.
BLOCK DIAGRAM :
COMPONENTS USED:
1. Arduino
2. HC-05 Serial Bluetooth Module
3. LCD Display
4. LED Indicators
5. Jumper Cables
6. Android App

4. Android App :
The microphone button is tapped and the voice command is given to
switch the corresponding device on/off. The voice recognizer listens and
converts what is said to the nearest matching words or text. The Bluetooth
adapter present in the phone is configured to send this text to the Bluetooth

5. module on the Arduino Uno board that would in turn control the electrical
appliancesthrough the relay boards.
PROCEDURE:
1. Connectthe HC-05 bluetooth moduleto Arduino board asshown.
2. Connectthe LCD display.The connections for LCD display are as follows:
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
3. ConnectLEDs to show the status of the devices.
4. Load the codeto Arduino board and run it.

6. PROGRAM:
// includethe library code:
#include<LiquidCrystal.h>
// initialize the library with the numbersof the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
String voice;
int light1=6;
int light2=7;
int fan1=8;
int fan2=9;
void setup(){
// set up the LCD'snumber of columnsand rows:
lcd.begin(16, 2);
// initialize the serial communications:
Serial.begin(9600);
pinMode(light1,OUTPUT);
pinMode(light2,OUTPUT);
pinMode(fan1,OUTPUT);
pinMode(fan2,OUTPUT);
}
void loop()
{
while(Serial.available())
{
delay(10);

7. char c=Serial.read();
if(c=='#')
{
break;
}
voice+=c;
}
if(voice.length()>0)
{
Serial.println(voice);
//String one=voice.substring(0,16);
if(voice=="on light 1"){digitalWrite(light1,HIGH);}
else if(voice=="off light 1"){digitalWrite(light1,LOW);}
else if(voice=="on light 2"){digitalWrite(light2,HIGH);}
else if(voice=="off light 2"){digitalWrite(light2,LOW);}
else if(voice=="on fan 1"){digitalWrite(fan1,HIGH);}
else if(voice=="on fan 1"){digitalWrite(fan1,LOW);}
else if(voice=="on fan 2"){digitalWrite(fan2,HIGH);}
else if(voice=="on fan 2"){digitalWrite(fan2,LOW);}
else if(voice=="all
on"){digitalWrite(light1,HIGH);digitalWrite(light2,HIGH);digitalWrite(fan1,H
IGH);digitalWrite(fan2,HIGH);}
else if(voice=="all
of"){digitalWrite(light1,LOW);digitalWrite(light2,LOW);digitalWrite(fan1,LO
W);digitalWrite(fan2,LOW);}
voice="";
// when characters arriveover the serial port.
if (Serial.available())
{
// wait a bit for the entire message to arrive
delay(100);
// clear the screen
lcd.clear();
// read all the available characters
while (Serial.available() > 0) {
// display each character to the LCD
lcd.write(Serial.read());

8. }
}
}
FUTUREDEVELOPMENT :
Further development can be implemented in the system by using a ZigBee
wireless communication module instead of a Bluetooth module. ZigBee is an
IEEE 802.15.4 standard for data communications with business and consumer
devices. Zigbee is targeted at applications that require low data rate, long
battery life, and securenetworking. Zigbee has a defined rate of 250 kbits/s, best
suited for periodic or intermittent data or a single signal transmission from a
sensor or inputdevice.
Further we can control actual AC appliances with the help of relays, which
can be switched on or off usingthe Arduino board.
CONCLUSION:
Voice based home automation system is successfully implemented using
Arduino. Establishing the system with little modifications could bring revolutionary
change in the way we interact with our home appliances.