home automation

1. A PROJECT SYNOPSIS
ON
VOICE CONTROL HOME APPLIANCE

2. TABLE OF CONTENTS
• INTRODUCTION
• PLATFORM USED
• AIM
• BLOCK DIAGRAM
• WORKING OF THE PROJECT
• MICROCONTROLLER
• COMPONENTS DESCRIPTION
• REFERENCE

3. Introduction

4. INTRODUCTION:
The nature’s most spectacular creation is human brain. The main
feature of the human brain is its ability to sense the obstacles and
respond according to them. The men always want to transplant his
ability to the artificial things so that they can not only sense the
problem but also respond according to that.
In this competitive corporate world every
organization wants to improve the efficiency as well as its
productivity. To improve the efficiency of organization,
automation is a preferred solution.
There is “Voice control home appliance” project. This
project is very useful for human. This system (Voice Control
Home Appliance) senses human voice and takes decision
according to command. In this project we used voice module,
microcontroller and mobile phone for successful decision. There is
used 89S52.

5. Platform used

6. Hardware requirements:
1) Voice module kit
2) Microcontroller 89S52
3) Transformer
4) LM7805 Regulator
5) Resistors
6) Capacitors
7) Diodes
8) Transistors
9) DC Fan
10) LED as a light
11) Mobile (must be android and 3G network)

7. AIM OF THE PROJECT
The aim of the project is to design such system, which
automatically switch ON or OFF the essential home appliances
like fan, light etc. As soon as any person enters the room and
speaks for sending the command, the light, fan or any other
appliance as per our need is switched ON and is switched OFF.

8. Block diagram

9. MICROCOTROLL
ER SECTION
89s52
Power
Supply
Voice
module kit
RELAY
FAN and
LIGHT

10. WORKING OF
THE PROJECT

11. The first step in any embedded project is to design the proper
hardware So firstly we have designed the +5v regulated dc supply
for the microcontroller as controller gets on +5 v supply after that
necessary connections of the microcontroller as connecting the
crystal oscillator for clock and reset section for resetting the
controller every time power gets on.
Then after we have 32 I/O pins from which we can configure any
pin as output or input.
A person can control appliance using voice command. Firstly we
record voice to operate system through voice command. When we
operate system then give voice command. We are using the voice
module kit for sensing the human voice. If human wants to
switched ON the home appliance then he speaks and this voice
recognized by voice module kit. Voice module is connected by
mobile phone and mobile Bluetooth will be ON continuously. This
voice command will be recognized to microcontroller with the help
of Bluetooth. Microcontroller read the command and sends the
signal to relay. FAN and light are connected by relay. If relay
receives ON signal then FAN and light will be switched ON. If
relay receives OFF signal then FAN and light will be switched
OFF.
Thus it performs the controlling of the appliance successfully.

12. MICROCONTROLLER
AT89C51/89s52
Features
• Compatible with MCS-51™ Products
• 8K Bytes of In-System Re programmable Flash Memory
• Endurance: 1,000 Write/Erase Cycles
• Fully Static Operation: 0 Hz to 24 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
•Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Programmable Serial Channel
• Low-power Idle and Power-down Modes
DESCRIPTION
The AT89s52 is a low-power, high-performance CMOS 8-bit
microcomputer 8Kbytes of Flash programmable and erasable read
only memory (PEROM). The device is manufactured using
Atmel’s high-density nonvolatile memory technology and is
compatible with the industry standard 80C51 and 80C52
instruction set and pin out.

13. The on-chip Flash allows the program memory to be
reprogrammed in-system or by a Conventional nonvolatile
memory programmer. By combining a versatile 8-bit CPU with
Flash on a monolithic chip, the Atmel AT89C52 is a powerful
microcomputer that provides a highly flexible and cost-effective
solution to many embedded control application.
The AT89s52 provides the following standard features: 8K
bytes of Flash, 256 bytes of RAM, 32 I/O lines, three 16-bit
timer/counters, a six-vector two-level interrupt architecture, a
full-duplex serial port, on-chip oscillator, and clock circuitry.
In addition, the AT89C52 is designed with static logic for
operation down to zero frequency and supports two software
selectable power saving modes. The Idle Mode tops the CPU
while allowing the RAM; timer/counters, serial port, and
interrupt system to continue functioning.
The Power-down mode saves the RAM contents but Freezes
the oscillator, disabling all other chip functions until the next
hardware reset..

15. Component
description

16. Transformers
A transformer is a device that transfers electrical energy from one
circuit to another by magnetic coupling without requiring relative
motion between its parts. It usually comprises two or more
coupled windings, and, in most cases, a core to concentrate
magnetic flux. A transformer operates from the application of an
alternating voltage to one winding, which creates a time-varying
magnetic flux in the core. This varying flux induces a voltage in
the other windings. Varying the relative number of turns between
primary and secondary windings determines the ratio of the input
and output voltages, thus transforming the voltage by stepping it
up or down between circuits.
LED (LIGHT EMITTING DIODE)
A junction diode, such as LED, can emit light or exhibit electro
luminescence. Electro luminescence is obtained by injecting
minority carriers into the region of a pn junction where radiative
transition takes place. In radiative transition, there is a transition of
electron from the conduction band to the valence band, which is
made possibly by emission of a photon. Thus, emitted light comes
from the hole electron recombination. What is required is that
electrons should make a transition from higher energy level to
lower energy level releasing photon of wavelength corresponding
to the energy difference associated with this transition. In LED the
supply of high-energy electron is provided by forward biasing the
diode, thus injecting electrons into the n-region and holes into p-
region.

17. ADVANTAGES OF LEDs:
1. Low operating voltage, current, and power consumption
makes Leds compatible with electronic drive circuits. This also
makes easier interfacing as compared to filament incandescent
and electric discharge lamps.
2. The rugged, sealed packages developed for LEDs exhibit
high resistance to mechanical shock and vibration and allow LEDs
to be used in severe environmental conditions where other light
sources would fail.
3. LED fabrication from solid-state materials ensures a longer
operating lifetime, thereby improving overall reliability and
lowering maintenance costs of the equipment in which they are
installed.
4. The range of available LED colours-from red to orange,
yellow, and green-provides the designer with added versatility.
5. LEDs have low inherent noise levels and also high immunity
to externally generated noise.
6. Circuit response of LEDs is fast and stable, without surge
currents or the prior “warm-up”, period required by filament light
sources.
7. LEDs exhibit linearity of radiant power output with forward
current over a wide range.
LEDs have certain limitations such as:
1. Temperature dependence of radiant output power and
wavelength.
2. Sensitivity to damages by over voltage or over current.
3. Theoretical overall efficiency is not achieved except in special
cooled or pulsed conditions.

18. FAN
Cooling fans and blowers provide cooling solutions to your system
thermal problems. The need for forced-air cooling by using an AC
or DC axial fan or blower should be determined at an early stage in
the system design. It is important that the design plans for good
airflow to heat-generating components and allows adequate space
and power for the cooling fan or blower.

19. References
1. Mazedi, The 8051 Microcontroller and Embedded Systems, Prentice
Hall, 1ST
Edition
2. Embedded System using 8051“ (E-book)
Lalit Kumar goel and Gaurav Sharma from Meerut
3. Kenneth J. Ayala, The 8051 Microcontroller, Penram International
Publishing,1996, 2nd
Edition
4. Some Websites :
 www.alldatasheets.com
 www.technowave.co.in
 www.datasheetcatalog.com
 www.electronicscircuits.com
 www.scielectronics.com
 www.parallax.com