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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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8/19/2019 Bluetooth Controlled Home Automation System Using 8051 Microcontroller
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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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8/19/2019 Bluetooth Controlled Home Automation System Using 8051 Microcontroller
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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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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
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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:
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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.
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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.
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(/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
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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.
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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
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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;
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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
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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)
reply (/comment/reply/246/1115)
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.
reply (/comment/reply/246/1208)
Feb 13, 2016
Shah Hussain
how to use AT commands in program
reply (/comment/reply/246/1305)
Feb 24, 2016
ronnie
Sir what IDE you use for code?
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RELATED CONTENT
reply (/comment/reply/246/1325)
Feb 24, 2016
Abhishek
Use Keil IDE.
reply (/comment/reply/246/1321)
Feb 24, 2016
ronnie
sir i'm using egbt-045ms as my bluetooth module. what will be the adjustment?
reply (/comment/reply/246/1347)
Feb 25, 2016
ronnie
Can i usethe same android app. even i'm using egbt-045ms as my bluetooth
module?
Leave a comment
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