Home Automation gives you access to control
devices in your home from a mobile device anywhere
in the world.
Lighting, appliances, electrical outlets, heating and
cooling systems– are hooked up to a remotely
Provide improved convenience, comfort, energy,
efficiency and security.
There is an increasing demand for smart
homes, where appliances react
automatically to changing environmental
conditions and can be easily controlled
through one common device.
This project presents a possible solution
whereby the user controls devices by using
their existing mobile phone ,where control is
communicated to the Microcontroller from
a mobile phone through its Bluetooth
Saves money(long run)
Makes life easier
1. ANDROID PHONE
2. MICROCONTROLLER (ATM89S52)
3. BLUETOOTH (HC-05 MODULE)
5. RELAY IC (ULN2003)
6. TRANSFORMER (220V/12V)
7. VOLTAGE REGULATOR IC 7805
8. DIODE BRIDGE
9. LED’S AND BULB’S
10. RESISTOR,CAPICTOR AND CONNCETING WIRES
11. SUPPLY BOARD
HC-05 is a Bluetooth Smart
module targeted for low-
power sensors and
It integrates all features
a Bluetooth Smart
It is powered directly from a
standard 3V coin cell battery
or a voltage regulator.
In the lowest power sleep
mode it merely consumes 500
nA and will wake up within a
few hundred microseconds.
It is preferable to use Bluetooth because now a days people have
their smart phones with them all the time, since the smart phones
have Bluetooth facility in them, thus it's better to use Bluetooth
rather than using RF remotes or IR remotes. Have you ever seen
people carrying remotes???
Using Bluetooth has many of its own advantages :
2.Easy to use.
3.It works in short distance range(i.e. upto 10mtrs.)
4.Anyone can find free Bluetooth apps on android and
A relay is an electrically
Relays are used where it is
necessary to control a
circuit by a low-power
Relays protect electrical
circuits from overload or
First Bluetooth module connected to the android phone
by the Bluetooth.
Android phone already have a application to provide the
interference between mobile and the Bluetooth module.
By using the application ,the mobile send the command
signal to microcontroller by the Bluetooth.
Bluetooth and relay IC is connect to the microcontroller
by its pins.
The relay is connected to the load by its pins.
When microcontroller receives the command from
mobile ,it operate the load.
This wireless technology is especially useful in
home environment, where there exists hardly any
infrastructure to interconnect intelligent appliances.
It could be suitably used for home automation in a
cost-effective manner. Operating over unlicensed,
universally available frequency of 2.4 GHz, it can
link digital devices within a range of 10 m
(expandable to 100 m, by increasing the
transmitted power) at the speed of 1 Mbps.
Building upon this theme; we propose a home
automation system based on Bluetooth
The overall system should be fast enough to realize
the true power of wireless technology.
Yet there is an increasing
demand for smart homes,
where appliances react
automatically to changing
environmental conditions and
can be easily controlled
through one common device.
This wireless technology is
especially useful in home
environment, where there exists
hardly any infrastructure to
The main advantage of “Home Automation
through Android Mobile” is that the “Physically
Challenged and Disabled People” .
Replace television, air conditioner etc., remotes for
Home Automation is undeniably a resource
which can make a home environment
automated. People can control their electrical
devices via these Home Automation devices and
set up controlling actions through Mobile.
In future this product may have high potential
Switchgear and Protection “P.S.Bimbra”;for
brief study of topic.
Google and Wikipedia for searching regards
www.electronicshub.org ;for explanation of
www.circuitsgallery.com ;for circuit study.