A

PROJECT REPORT

ON

HOME AUTOMATION USING ARDUINO

Submitted By: - Submitted To:- Eklavya Sharma Satish Kumar Rai

Roll No.- 12EBKEE031 Assistant Professor (The Branch- Electrical Engineering I Department of Electronics) B K Birla Institute of Engineering & Technology, Pilani B K Birla Institute of

Engineering & Technology, Pilani Mobile: +91 9785551210

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 wate r 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.

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.

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

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 will switch 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; // the setup routine runs once when you press reset:

void setup() { // initialize the digital pin as an output.

pinMode(relay, OUTPUT); Serial.begin (9600);

}

// the loop routine runs over and over again forever:

void loop() {

if(Serial) {

if(Serial.available()>0)

{

val=Serial.read(); Serial.println(val,DEC);

relaycontrol(val); }

} }

void relaycontrol(int val) { switch(val) { case 97 : turnon(); break; case 101 : turnoff(); break; default: turnoff();

}

} void turnon() { digitalWrite(relay, HIGH); delay(1000); } void turnoff() { 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.

CODE BLOCKS-

CONCLUSION

The system as the name indicates, ‘Android based home automation’ makes the system more flexible and

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

system is proposed using the relatively new communication technologies. The system consists of mainly

three components is a Bluetooth module, Arduino microcontroller and relay circuits. Bluetooth is used as

the communication channel between android phone and the Arduino microcontroller. We hide the

complexity of the notions involved in the home automation system by including them into a simple, but

comprehensive set of related concepts. This simplification is needed to fit as much of the functionality on the limited space offered by a mobile device’s display.