bluetooth controlled home automation system using 8051 microcontroller

8/19/2019 Bluetooth Controlled Home Automation System Using 8051 Microcontroller

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Bluetooth Controlled Home Automation System Using 8051 Microcontroller

Bluetooth Controlled Home Automation System using 8051(/microcontroller-projects/bluetooth-controlled-home-automation-using-8051)

By Saddam 7 Comments (/microcontroller-projects/bluetooth-controlled-home-

automation-using-8051/#comments)

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Imagine that you can control the electronic appliances of your home from anywhere inside the

house, just using your Smart phone. In this project, we will use wireless Bluetooth technology to

control the Home Electronic Appliances through a Android Phone. Bluetooth has a range of 10-

15 meters, so that you can switch ON and OFF any electronic appliance within the range. We have

also developed a Toy car controlled by Android Phone (http://circuitdigest.com/microcontroller-

projects/bluetooth-controlled-robot-car-using-arduino), using Bluetooth module and Arduino.

Here we have used 8051 microcontroller with a Bluetooth module, for wirelessly receive the data,

sent from the Android Phone. So that microcontroller can Turn ON and OFF the home appliances

accordingly. [Check here more 8051 microcontroller based projects (http://circuitdigest.com/8051-

microcontroller-projects)]

Main Components

8051 microcontroller

Bluetooth Module HC05

Relay

ULN2003

Bulb

Holder

Wire

IC 7805Android phone

Bluetooth controller app Android app

10uf capacitor

1000uf capacitor

10K resistor

1k resistor

Power Supply

Bluetooth Module:

HC-05 Bluetooth module consists two things one is Bluetooth serial interface module and a

Bluetooth adaptor. Bluetooth serial module is used for converting serial port to Bluetooth.

http://circuitdigest.com/8051-microcontroller-projectshttp://circuitdigest.com/microcontroller-projects/bluetooth-controlled-robot-car-using-arduino


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How to operate Bluetooth module?

You can directly use the Bluetooth module after purchasing from market, because there is no need

to change any setting of Bluetooth module. Default baud rate of new Bluetooth module is 9600

bps. You just need to connect rx and tx to controller or serial converter and give 5 volt dc regulated

power supply to module.

Bluetooth module has two modes one is master mode and second one is slave mode. User can set

either mode by using some AT commands. Even user can set module’s setting by using AT

command. Here is some commands uses are given:

First of all user need to enter AT mode with 38400 bps baud rate by pressing EN button at

Bluetooth module or by giving HIGH level at EN pin. Note: all commands should ends with \r\n

(0x0d and 0x0a) or ENTER KEY from keyboard.

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Home Automation

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4/19

After it if you send AT to module then module will respond with OK

AT → Test Command

AT+ROLE=0 → Slave Mode select

AT+ROLE=1 → Master Mode select

AT+NAME=xyz → Set Bluetooth Name

AT+PSWD=xyz → Set Password

AT+UART=,, → set Baud rate

Eg. AT+UART=9600,0,0

Pin Description of accelerometer:

1. STATE → Open

2. Rx → Serial receiving pin3. Tx → Serial transmitting pin

4. GND → ground

5. Vcc → +5volt dc

6. EN → to enter in AT mode

7.

Working Explanation:

In this project we have used 8051 microcontroller for controlling the whole process of this project.And a Bluetooth module is used for controlling the home appliances wirelessly. Home appliances

will turned ON and OFF when user will touch button in the Bluetooth mobile app in Android mobile

phone. To run this project, first we need to download Bluetooth app form Google play store. We

can use any Bluetooth app that can send data using Bluetooth. Here are some apps name that can

be used:

1. Bluetooth Spp pro

2. Bluetooth controller


5/19

After installing the App, you need to open it and then search Bluetooth device and select HC-05

Bluetooth device. And then configure keys.

Here in this project we have used Bluetooth controller app.

1. Download and install Bluetooth Controller.

2. Turned ON mobile Bluetooth.

3. Now open Bluetooth controller app

4. Press scan

5. Select desired Bluetooth device (Bluetooth Module HC-05).

6. Now set keys by pressing set buttons on screen

To set keys we need to press ‘set button’ and set key according to picture given below:


6/19

After setting keys press ok.

You can see in the above picture that there are 9 buttons in which first row is for fan controlling,

second one is for light controlling and last one is for TV controlling. Means First row’s ON and OFF

buttons are used to ON and OFF the fan, second row’s buttons are for Light and third ones are for

TV. We have used three bulbs of different colors instead of TV and fan, for demonstration purpose.

Now, when we touch any button in Bluetooth controller app then Android phone sends a value to

Bluetooth module, after receiving this value, Bluetooth module sends the received value to the

microcontroller and then microcontroller reads it and compare it with predefined value. If any

match is occurred then microcontroller performs relative operation. Same operation will performed

each time when button pressed.


7/19

Now, when user touch ‘Fan On’ button in Bluetooth controller app then microcontroller receives ‘1’

via Bluetooth module and then controller Switch ‘On’ the Fan by using relay driver and relay. And

when user touch ‘Fan Off’ button in Bluetooth controller app then microcontroller receives ‘2’ via

Bluetooth module and then controller Switch ‘Off’ the Fan by using relay driver and relay.

Likewise 3,4,5,6 numbers are sent by Android Phone, when Light On, Light Off, TV On, TV Off button

has been touched respectively:

Button Data Operation

Fan On 1 Fan Turned On

Fan Off 2 Fan Turned Off

Light On 3 Light Turned On

Light Off 4 Light Turned Off

TV On 5 TV Turned On

TV Off 6 TV Turned Off

Circuit Diagram and Explanation

Circuit connections of this project are very simple. Bluetooth module’s Rx and Tx pins are directly

connected to the Tx and Rx pins of Microcontroller. Three 5 volt relays are used as a switch for

turning On and Off the home appliances running on AC mains. And a relay driver ULN2003 is used

for driving relays. Fan, Light and TV are connected at P2.1, P2.2 and P2.3 via relays and relay driver.

An 11.0592 MHz Crystal oscillator is used in this circuit for generating clock signal for

microcontroller. And a 5 volt voltage regulator LM7805 is used for provide 5 volt for the whole

circuit.


8/19

(/fullimage?i=circuitdiagram_mic/Bluetooth-Controlled-Home-Automation-Circuit-diagram.gif)

Program Explanation:

In this program, first of all we have included header file and defines input, output pins and

variables.

#include

sbit Fan=P2^0;

sbit Light=P2^1;

sbit TV=P2^2;

char str;

char Charin=0;

After this we have created a function for delay.

void delay(int time)

{

unsigned int i,j;

for(i=0;i


9/19

void Serialwrite(char byte)

{

SBUF=byte;

while(!TI);

TI=0;

}

void Serialprintln(char *p)

{

while(*p)

{

Serialwrite(*p);

p++;

}

Serialwrite(0x0d);

}

void Serialbegin(){

TMOD=0x20;

SCON=0x50;

TH1=0xfd;

TR1=1;

}

After this, in main program we have initialized UART and monitored the SBUF register for receiving

the data. Then data is matched and compared with predefined values and relative operation hasbeen performed.


10/19

void main()

{

P2=0x00;

Serialbegin();

Serialprintln("System Ready...");

delay(50);

while(1)

{

while(!RI);

Charin=SBUF;

str=Charin;

RI=0;

if(str=='1')

{

Fan=1;

Serialprintln(" Fan ON");

delay(50);}

else if(str=='2')

{

Fan=0;

Serialprintln(" Fan OFF");

delay(50);

}

So that’s how we can create a whole system for the house and can connect all the AC appliancesto the 8051 microcontroller using Relays. And this bluetooth controlled home automation

system can be operated from a Smart phone.

Code:

#include

sbit Fan=P2^0;

sbit Light=P2^1;

sbit TV=P2^2;

char str;

char Charin=0;

void delay(int time)

{

unsigned int i,j;

for(i=0;i


11/19

while(!TI);

TI=0;

}

void Serialprintln(char *p)

{

while(*p)

{

Serialwrite(*p);

p++;

}

Serialwrite(0x0d);

}

void Serialbegin()

{

TMOD=0x20;

SCON=0x50;

TH1=0xfd;TR1=1;

}

void main()

{

P2=0x00;

Serialbegin();

Serialprintln("System Ready...");

delay(50);

while(1){

while(!RI);

Charin=SBUF;

str=Charin;

RI=0;

if(str=='1')

{

Fan=1;

Serialprintln(" Fan ON");

delay(50);

}

else if(str=='2')

{

Fan=0;

Serialprintln(" Fan OFF");

delay(50);

}

else if(str=='3')

{Light=1;


12/19

Serialprintln(" Light ON");

delay(50);

}

else if(str=='4')

{

Light=0;

Serialprintln(" Light OFF");

delay(50);

}

else if(str=='5')

{

TV=1;

Serialprintln(" TV ON");

delay(50);

}

else if(str=='6')

{

TV=0;

Serialprintln(" TV OFF");

delay(50);

}

str=0;

}

}

Video:

Bluetooth Controlled Home Automation Using 8051

https://www.youtube.com/watch?v=lrPzKnrUk2k


13/19

Add new comment (/microcontroller-projects/bluetooth-controlled-home-automation-using-

8051#comment-form)

Level switchRobust, simple solutions

for reliable level detection.

Comments (7)

reply (/comment/reply/246/1081)

Feb 05, 2016

Pearl

Please I can't really interpret the circuit diagram and what software did you use for

the simulation (was it proteus)


Feb 07, 2016

saddam khan

this circuit diagram is draw by using dip trace software.

and i think it easy to understand. you need to give some of your concentration on

the circuit to understand.

try it again.


Feb 13, 2016

Shah Hussain

how to use AT commands in program


Feb 24, 2016

ronnie

Sir what IDE you use for code?

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Feb 24, 2016

Abhishek

Use Keil IDE.


Feb 24, 2016

ronnie

sir i'm using egbt-045ms as my bluetooth module. what will be the adjustment?


Feb 25, 2016

ronnie

Can i usethe same android app. even i'm using egbt-045ms as my bluetooth

module?

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