This document describes a voice-controlled home automation project using an Arduino microcontroller and Bluetooth module. The system allows users to control home appliances like lights, fans, TVs and pumps with voice commands to the smartphone app. It is intended to help elderly and disabled people control their homes more easily. The document outlines the components, circuit diagram, working principle and steps to set up the voice commands for controlling different devices and relays. Potential improvements are also discussed, like adding more relays or using WiFi for wider range.

1. Voice Controlled
Home Automation

2. What is this project ?
• This project is all about controlling your home
appliances and systems by using your voice as input,
for the use of disabled and elderly.
• Automation has a major role in our day-to-day lives.
• Home automation allows us to control electrical
appliances like ac, fan, etc.
• It can also provide home security and emergency
systems too.
• It may also control home security systems such as
access control and alarm systems.

3. Why we need to automate ?
• The main objective of home automation is
to help handicapped and elderly people
that will enable them to control home
appliances and to alert them during critical
situations.
• Other objectives include
• Increasing the comfort of living,
• Better control over devices from a single
control
• More organised way to make your home a
better place.

4. PROS OF HAVING AN AUTOMATED HOME
Full control over all smart appliances
with only one device
Smart homes may be
suitable for disabled persons
Support for the
older
generation
Increased
energy
efficiency
Increasing
luxuory
Flexibility for
new devices

5. What we will be doing?
• In this project, we try to implement home
automation system using a
microprocessor(Arduino) and a smart phone.
• Here we will be controlling four different home
appliances by voice Command.
• One can also use IR remotes, local Wi-Fi to control
these devices.
• The key components of this project are Arduino,
Bluetooth module, Relay module, LCD display, a
smartphone, and Android App.

6. Steps involved
At first, we need to install a app on our smartphone, which will be
available in the play store. This app receives our Voice command and
sends it to the Bluetooth module wirelessly.
The Arduino decodes this command from the Bluetooth module.
Then Arduino sends a command to the Relays to control the home
appliances.
These four home appliances are switched on/off by eight different voice
commands. The LCD module will display the status of the home
appliances on or off.

7. Block Diagram

8. Components Required
• Arduino UNO/Nano – Microcontroller
• HC-05 Bluetooth module – For
communication between mobile and
microcontroller
• 4-Channel relay module- to turn on/off
devices using a low input signal
• LCD Display Module- displays the status of
the device
• PCB prototyping board- to connect the wires.

9. Components Required
• 12V DC power supply- power source of
the system
• 220V Ac power supply- source for the
devices to run
• Connecting wires
• A mobile phone – to give voice inputs
• “Bluetooth voice control for the
Arduino” app to send data to the
module HC-05

10. Bluetooth module HC-05
• HC-05 module is Bluetooth SPP (Serial Port Protocol) module,
• It is used for wireless communication between Arduino Uno
and smartphone.
• HC-05 can operates at power 3.6 to 6 volts.
• It has 6 pins: State, RXD,
TX, GND, VCC and EN.

11. Why Bluetooth…
• We prefer Bluetooth over others because everyone
has a smartphone with them all the time and they
have built-in Bluetooth facilities
• Hence, it is better to use Bluetooth instead of
carrying any separate remote controls.
• Their advantages are:
*Security
*Easy to use
*Works in short range
*We can find free Bluetooth apps

12. 4 Channel relay module
• A relay is an electromagnetic switch which can be turned on
and off by using low power signals
• When activated, the electromagnet pulls to either open or
close an electrical circuit.
• We will be using a 4Channel 5V relay module in this project
• The board is both 3.3V and 5V
logic compatible and uses 4
digital outputs to control 4
individual relays..

13. Relays

14. Circuit
Diagram

16. Working principle
• The working principle can be explained in
three steps.
Step 1
• At first, we need to set up the android app and configure it to
send signals to the Bluetooth module
Step 2
• Secondly, we have to define a set of commands to the
Arduino based on which the source code is written. These
commands will be used by the user to achieve specific tasks
Step 3
• And at last, we will try to understand how relays work to
control the circuit.

17. Setting up the commands
• At first, we need to choose 8 different types of
Voice Commands to control 4 devices.
• Particularly two voice commands are used to
control a device.
• For example, the “turn on light ” command is
used to Turn ON the Light, and the “turn off
light ” command is used to turn OFF the Light.
• These Voice commands will be used in Arduino
code.

18. • The commands we will be using are:
Command Function Pin
turn on light Light On Relay-1 (IN1)
turn off light Light Off
turn on fan Fan On Relay-2 (IN2)
Turn off fan Fan Off
turn on TV TV On Relay-3 (IN3)
turn off TV TV Off
turn on pump Pump On Relay-4 (IN4)
turn off pump Pump Off
turn on all All Device On Relay-1, Relay-2
Relay-3, Relay-4 (IN1,
IN2, IN3, IN4)
turn off all All Device Off

19. Working of relays
• When we send a voice command through the App,
then the Bluetooth module receives that command
and passes it to the Arduino.
• Now Arduino compares this command with the
predefine Commands (which are defined in
Arduino code). If this command matches then
Arduino sends a command to operate the relay
module.
• We can see the Device status (on or off) on the
16×2 LCD Display Module.

20. Device turns
on and status
displayed in
led screen
Sends low
voltage input
(0V) to relay
pin IN 1
Arduino gets
the command
Command:
"Turn on
light”
Turning on a device
• Lets see how this works. For example, the
command is “Turn on light”

21. Turning off a device
• Lets see how this works. For example, the
command is “Turn off light”
Device turns
off and status
displayed in
led screen
Sends high
voltage
=input (5V) to
relay pin IN 1
Arduino gets
the command
Command:
"Turn off
light”

22. Cons of having voice automation
Extreme installation
cost when fully
automated
Technological problems
in connected homes
Some initial learning
efforts are necessary
You may lock yourself
out of your own house
Helplessness if
technology fails
Reliable internet
connection is crucial
Helplessness if
technology fails
Maintenance and repair
issues

23. Ways to improvise the design
• We can add more relays to control more devices.
• The coverage of wireless control is 10metres.If we
want more coverage, then one can go for GSM
modules
• one can go for a local Wi-Fi system.
• We can also use sensors to fully automate
processes like cooling systems.
• This can be extended to many applications in
industries and healthcare.

24. Conclusion
• In this presentation, we have introduced design and
implementation of a low cost, flexible and wireless
solution to the home automation.
• The system is secured for access from any user or
intruder.
• Passwords can be changed by the user at any point,
and this adds a additional layer of protection from
unauthorized users.
• This system can be used as a test bed for any
appliances that requires on-off switching
applications without any internet connection.

25. THANK YOU
Prepared by,
Thoushick Ram P
Tamilkumaran S
Subikshwar K
Srivarsan S
Subasurya R
Thulasiraman E