This document provides details on a home automation project using Arduino. The project aims to design a kit that can control AC loads like lights and fans from an Android phone using an Arduino microcontroller. It discusses the components required like a step-down transformer, Arduino, relays, Bluetooth module, and loads. The circuit diagram and Arduino code for controlling relays on button press from a Bluetooth-connected Android app are also provided. The conclusion states that the system provides a flexible and attractive user interface for home automation compared to other systems.

1. A
PROJECT REPORT
ON
HOME AUTOMATION USING ARDUINO
SubmittedBy: - SubmittedTo:-
Eklavya Sharma SatishKumar Rai
Roll No.- 12EBKEE031 AssistantProfessor(The
Branch- Electrical EngineeringI Departmentof Electronics)
B K BirlaInstitute of Engineering&Technology,Pilani B K BirlaInstitute of
Engineering& Technology,
Pilani
Mobile:+91 9785551210

2. 1. INTRODUCTION
Home automation is becoming more and more popular day by day due to its numerous advantages.
This can be achieved by local networking or by remote control. Our Aim is to design a kit that can be
used for controlling AC Loads from Android phone by using Arduino as microcontroller. Home
automation refers to the use of computer and information technology to control home Appliances
and features (such as windows or lighting).Systems can range from simple remote control of lighting
through to complex computer/micro-controller based networks with varying degrees of intelligence
and automation. Home automation is adopted for reasons of ease, security and energy efficiency.
In modern construction in industrialized nations, most homes have been wired for electrical powe r,
telephones,TV outlets (cable or antenna), and a doorbell.Many household tasks were automated by
the development of specialized Appliances. For instance, automatic washing machines were
developed to reduce the manual labor of cleaning clothes, and water heaters reduced the labor
necessary for bathing.
2. LIST OF COMPONENTS REQUIRED
2.1 STEP DOWN TRANSFORMER
A single phase 230:18 V step down transformer is required for 12v dc power supply.
Figure 1: Step down transformer
2.2 MICROCONTROLLER
We have used Arduino as microcontroller for giving signals to the relays and taking signal from HC
06.Which takes 5 V dc power supply.

3. Figure 2: Arduino Microcontroller
2.3 DC RELAYS
Required no of relays of 12 V DC are used for switching purposes.
Figure 3: DC Relays
2.4 DIODES
Diodes are used in the circuit for rectification and a single diode is used as freewheeling diode. All
diodes are 1N4007.
Figure 4: Diodes
2.5 MOSFET
General purpose NMOS IRF510 is required for switching operation.
2.6 BLUETOOTH RECEIVER HC 06
A Bluetooth receiver HC 06 is required for catching signal from android phone.

4. Figure 6: Bluetooth Receiver
2.7 VOLTAGE REGULATOR IC
LM 7812 a voltage regulator IC is used in the 12V DC Power supply.
2.8 LOAD
A single phase 230 V, 50 Hz, load is required.
2.9 ELECTRICAL WIRE AND JUMPER WIRES
Electrical wire is used in the AC power supply and Jumper wire in the DC power Supply.
2.10 RESISTANCE AND CAPACITANCES
Resistances are used for current limiting and capacitances are used for reducing ripples in DC power
supply as per specifications.
3. CIRCUIT DIAGRAM

5. Fig. Arduino Controlled Relay
Fig. Full-Wave Bridge Rectifier
WORKING-
When the button is pressed in the application then it will send a signal to the Arduino board
through HC-06 which will put pin 13 in HIGH state, meaning 5V on pin 13. This voltage is used to
drive the MOSFET that willswitch ON the relay and the load will be powered from the main power
supply.
We use an external power supply (Vcc) that is between 7 to 12 volts to power up the Arduino
board and the transistor + relay. For that purpose we’ve made a full wave bridge rectifier. The
load uses its own power supply, for instance if you use a light bulb then you might connect it to
the 110/220V mains or any other power source.
ARDUINO CODE-
const int relay = 13;
int val;
// thesetup routine runs once when youpress reset:
voidsetup() {
// initializethedigitalpinas an output.
pinMode(relay,OUTPUT);
Serial.begin (9600);
}
// theloop routine runs over and over againforever:
voidloop()
{
if(Serial)
{
if(Serial.available()>0)

6. {
val=Serial.read();
Serial.println(val,DEC);
relaycontrol(val);
}
}
}
voidrelaycontrol(int val)
{
switch(val)
{ case 97 : turnon();
break;
case 101 : turnoff();
break;
default: turnoff();
}
}
voidturnon()
{
digitalWrite(relay,HIGH);
delay(1000);
}
voidturnoff()
{
digitalWrite(relay,LOW);
delay(1000);
}
ANDROID APPLICATION
A smart phone is a mobile phone with an operating system. Smart phones typically include the
features of a phone with those of another popular consumer device, such as a personal digital
assistant, a digital camera, a media player or a GPS navigation unit. Later smartphones include all of
those plus a touchscreen interface, broadband internet, web browsing, Wi-Fi, 3rd-party Apps, motion
sensors and mobile payment mechanism.
Even with limited programming experience, you can easily learn to create Apps for the Android
platform with this complete guide to App Inventor for Android. App Inventor for Android is a visual
language that relies on simple programming blocks that users can drag and drop to create Apps.

7. CODE BLOCKS-
CONCLUSION
The systemasthe name indicates,‘Androidbasedhomeautomation’makesthe systemmore flexibleand
provides attractive user interface compared to other home automation systems. In this system we
integrate mobile devices into home automation systems. A novel architecture for a home automation
systemis proposedusingthe relativelynew communicationtechnologies.The systemconsistsof mainly
three componentsisaBluetoothmodule,Arduinomicrocontrollerandrelaycircuits.Bluetoothisusedas
the communication channel between android phone and the Arduino microcontroller. We hide the
complexityof the notionsinvolvedinthe home automationsystemby includingthemintoa simple,but
comprehensive setof relatedconcepts.Thissimplificationisneededtofitasmuchof the functionalityon
the limited space offered by a mobile device’s display.