Automation is a trending topic in 21st century making an important role in our daily lives. Automation reduces the human labor, time, effort and some human errors. The key objective of our project is to design a system for physically handicapped persons to control and operate home appliances and their own wheel chair by their own voice. Both these qualities are present in our project which has the capability to replace existing technologies. the design of the low cost voice recognition based home automation system for the physically challenged people suffering from quadriplegia or paraplegia (who cannot move their limbs but can speak and listen) to control the various home appliances just by his/her voice commands according to their need and comfort. We also implemented a messaging concept. In this whenever the patient or the person needs a help, if he/she pronounce as help a message will be sent to their respective represented family member. The resultant system can provide a great assistance to the physically handicapped people without any need of third person.

2. CONTENTS
 ABSTRACT
 INTRODUCTION
 BLOCK DIAGRAM
 COMPONENTS
 VR MODULE
 MICRO PHONE
 PROCESSOR
 GSM MODULE
 LCD
 RF TRANSMITTER AND RECIEVER
 RELAY CIRCUIT
 ADVANTAGES
 APPLICATIONS
 RESULTS
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3. ABSTRACT
• The key objective of our system design is to provide easy means for
normal, handicapped and old age persons to control and operate
home appliances.
• Since home automation is gaining popularity day by day in today’s
world, we require a system which is affordable and simple to
implement.
• Develop an embedded system which is used to control the home
appliances through voice for the visually impaired people and also
for the physically challenged people.
• Though various techniques have been proposed and are available
currently, most of them are not user friendly for the visually
impaired people and thus a friendly system has been developed for
them.

4. INTRODUCTION
• Wireless home network.
• Provide secure Realize the concept of a smart home.
• Has the more applications than the traditional manual methods.
• Require home automation system to satisfy their needs and comfort
while for physically challenged people it can provide great
assistance.
• Need a person which take care’s movement disabled or paralyzed
patient.
• And appliances cannot be handled by them. So they need constant
help and they cannot work independently.
• It can also be used to send messages Or call someone on mobile
phone, All this can be done with just a few voice commands.

5. VOICE
RECOGNITION
SERIAL
COMMUNICA
TION
MICRO
PHONE
MICRO
CONTROLLER
AT MEGA
328p
POWER
SUPPLY
LCD
DISCIPLAY
SWITCHING
CIRCUIT
RF
TX
RF
RX
OSCILL
ATOR
BLOCK DIAGRAM
FIG-1: BLOCK DIAGRAM OF THE PROJECT
DRIVER
MODULE
GSM
MODULE
FAN
LIGHT

6. MICRO PHONE
• A microphone is a transducer that converts sound into an electrical
signal.it is commonly named as Mike.
• Microphones are used in many applications such as telephones, hearing
aids, public address systems for concert halls and public events, motion
picture production audio engineering, radio and television broadcasting,
in computers for recording voice, speech recognition and for non-acoustic
purposes such as ultrasonic sensors.
FIG-2: MICRO PHONE

7. VOICE RECOGNITION MODULE
 A microphone picks up the signal of the speech to be recognized
and converts it into an electrical signal.
 A modern speech recognition system also requires that the
electrical signal be represented digitally by means of an analog-
to-digital (A/D) conversion process, so that it can be processed
with a digital computer or a microprocessor.
 This speech signal is then analyzed to produce a representation
consisting of salient features of the speech.
 speech pattern is then compared to a store of phoneme patterns or
models through a dynamic programming process in order to
generate a hypothesis of the phonemic unit sequence.

8. Parameters:
• Voltage: 4.5-5.5V.
• Current: <40mA.
• Digital Interface: 5V TTL level for UART
interface and GPIO.
• Analog Interface: 3.5mm mono-channel
microphone connector + microphone
pin interface.
• Size: 31mm x 50mm.
• Recognition accuracy: 99%
Features:
• Support maximum 80 voice commands,
with each voice 1500ms (one or two
words speaking).
• Maximum 7 voice commands effective
at same time.
• Arduino library is supplied
• Easy Control: UART/GPIO.
• User-control General Pin Output.
FIG-3:VOICE RECOGNITION MODULE

9. GSM - MODULE
9
 Dual-Band 900/ 1800 MHz
GPRS multi-slot class 10/8GPRS mobile
station.
 Class 1 (1 W @ 1800/1900MHz)
Control via AT commands (GSM 07.07
,07.05 and SIMCOM enhanced AT
Commands).
 Low power consumption: 1.5mA(sleep
mode)
 Operation temperature:-40°Cto +85 °C.
 Status indicator(D5):It will flashes
continuously whenever the call arrives
otherwise it is left ON.
 Network LED(D6):This led will blink
every second.
FIG-4:GSM MODULE

10. PROCESSOR
• The AT MEGA 328 operates between 1.8 - 5.5 volts.
• Three flexible timer/counters with compare modes, internal and external
interrupts, serial programmable USART.
Parameter Value
• Number AT MEGA 328p
• Bits 8 bit
• Flash (k Bytes): 32 k Bytes
• Pin Count: 32
• Max. Operating Freq. (MHz): 16 MHz
• CPU: 8-bit
• Max I/O Pins: 23
• Ext Interrupts: 24
• USB Interface: No
10

11. FIG-5:ARDUINO-UNO

12. LCD
12
 A 16x2 alphanumeric LCD is
most widely used module of
LCD nowadays.
 The reason for choosing LCD
over other display component or
devices is that it is
 Low cost
 Easily programmable
 Large number of display
character etc.
 It has two type of register
inbuilt that is
 Command Register
 Data Register.
FIG-6: LCD

13. RF TRANSMITTER AND RECEIVER
13
• It operates at Radio Frequency. The
corresponding frequency range
varies between 30 kHz & 300 GHz.
• In this RF system, the digital data is
represented as variations in the
amplitude of carrier wave.
• This kind of modulation is known as
Amplitude Shift Keying (ASK).
FIG-7 : RF TRANSMITTER CIRCUIT DIAGRAM

14. 14
• The RF module is often used along
with a pair of encoder/decoder.
• The encoder is used for encoding
parallel data for transmission feed
while reception is decoded by a
decoder.
• HT12E-HT12D, HT640-HT648, etc.
are some commonly used encoder /
decoder pair ICs.
FIG-8 : RF RECEIVER CIRCUIT DIAGRAM

15. RELAY MODULE
 A relay is an electrically operated switch.
Many relays use an electromagnet to
mechanically operate a switch, but other
operating principles are also used, such
as solid-state relays.
 Relays are used where it is necessary to
control a circuit by a separate low-power
signal, or where several circuits must be
controlled by one signal.
 The first relays were used in long
distance telegraph circuits as amplifiers: they
repeated the signal coming in from one
circuit and re-transmitted it on another
circuit.
FIG-9:RELAY MODULE

16. FIG-10:RELAY MODULE

17. ADVANTAGES
17
 Low cost.
 Easy to use.
 Comfortable to live.
 Smart home.
 Prevents wastage of
electricity.
 Highly flexible.
 Quick response time.
 Real-time application.
 Reduces the use of human
activity.
 Highly secured.
 High accuracy.

18. APPLICATIONS
 Home where we can control whole
appliances.
 Industries where we can control
machines by just saying instructions.
 This project is useful for the blind
people.
 Notice board to show whatever
messages they want to display
 Military applications.
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19. RESULTS
FIG-11: HOME APPLICANCES

20. FIG-12:WHEEL CHAIR FIG-13:MESSAGE REQUEST