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Home automation deals with providing a
network in the house which links
īĄcomputers & peripheral equipment,
īĄsmart chip bearing household appliances
(white goods) e.g. dish washers, washing
machines, microwaves etc., and
īĄsub-systems like Heating, Ventilation, Air-
conditioning (HVAC), and security systems.
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īYour security system knows all about your occupancy
of the house. With a little more development it can
build an intelligent
âexpert systemâ to predict your usage.
īYour central heating programmer knows the
standards of comfort you expect â but doesnât know
which rooms are in use.
īBy linking just these two you could achieve a
reduction in fuel costs and a better match to your
requirements.
4. 4
īPC-based system: Requires a PC to be running at all
times.
īDedicated PC
īShared PC
īStandalone system: Runs without a PC, although may
use a PC for programming
īHybrid system: Runs without a PC, but uses PC to add
more functions.
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īThe goal of this project was to develop a home
automation system that gives the user complete
control over all voice controllable aspects of his or her
home.
īThe automation system has the ability to be
controlled from a central host PC through voice.
10. 10
īThe way of this concept function is when a user speaks out
some command, then the voice is captured through
microphone as the input devices.
īOnce the voice is captured, the usage of a decoding system that
will convert the analog (voice) to digital (binary signal).
īLater, the input voice is compared with the data stored in the
memory early before the testing.
īThe output of the comparison is the voice matched with any of
the command trained and certain signal is produce as the input
for the controlling system.
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In this section will discuss on the hardware used in the
implementation of this system that include theULN2003
IC chip, microcontroller, voltage regulator and the relay
for interfacing.
RS 232 interface serial communications
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13. 13
ī The standard is simply concerned with serial data
communication between the computer which has the voice
recognition software and the hardware kit.
ī Cabling :Single-ended
ī Number of Devices :1 transmit, 1 receive
ī Communication Mode: Full duplex
ī Data Rate (max) :1Mbps
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ī In this project we use 7805 regulator to make a
perfect 5 volt dc to microcontroller circuit.
ī Regulated 5 volt supply is connected to the Pin no 40
of controller . IC 7805 is a three pin regulator . Pin no
1 is input pin , pin no 2 is ground pin and pin no 3 is
output pin. Here 78 mean positive voltage and 5
means 5volt. 79 means negative voltage . There are so
many regulator available from 7805 to 7818 volt, here
18 means 18 volt. Pin no 20 of the controller is
connected to ground pin. Pin no 1 to 8 is for the port 1.
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ULN 2003
The ULN2003 is a small integrated circuit that contains
8 transistor driver channels. Each channel has an input
to a resistor connected to the base of a transistor and a 1
amp open collector output capable of handling up to
about 30volts . Each of the collectors has a reverse
biased diode connected to a common Vcc pin that
provides inductive spike protection.
The output from the microcontroller is fed into the
ULN2003 relay driver and this relay driver decides
which port should be kept on or off based on the output
from the microcontroller.
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16. 16
īâĸ Compatible with MCS-51âĸ Products
īâĸ Fully Static Operation: 0 Hz to 24 MHz
īâĸ Three-Level Program Memory Lock
īâĸ 128 x 8-Bit Internal RAM
īâĸ 32 Programmable I/O Lines
īâĸ Two 16-Bit Timer/Counters
īâĸ Programmable Serial Channel
17. 17
Relay
In this project, the primary interface between the
systems with the electrical appliance is the relay.
The relay is actually a switch alike component just the
difference is the way of triggering is through the
magnetic field that will change the contact and thus
activating a switch.
The relay. 17
18. 18
īIn the power supply section we use one step down
transformer to step down the voltage from 220 volt ac to
9 volt dc since the operating voltage for the ULN2003
relay driver is 9v .
īOutput of the transformer is further connected to the two
diode circuit. Here two diode work as a full wave
rectifier circuit. Output of the full wave rectifier is now
filtered by the capacitor.
19. 19
The applications are limited only by your imagination:
ī¨ Turning lights down / off at night.
ī¨ Operating outside lights
ī¨ Turning lights or radio on / off when someone
approaches the house, simulating occupancy
ī¨ Operating television, hot water heater, kettle,
toaster etc. ready for your use.
ī¨ Optimizing use of low cost electricity.
ī¨ Working with intelligent electrical white goods e.g.
washing machine, fridge, microwave etc.
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RESULT AND DISCUSSION
īThe main aim of the project was to design a system in
such a way that it can yield maximum output with
minimum complexity and this home automation
system successfully delivered it.
īThere are some issue that arises when using this
system. The problems are the pronunciation of the
user when doing the process. For the pronunciation
matter, the system takes it at a quite high level of
sensitivity. . So when the user wishes to use the
system, thus he or she must produce the word with
the correct pronunciation as in the training process