Download CONTROL OF ELECTRICAL APPLIANCES THROUGH TV REMOTE

THE NATIONAL INSTITUTE OF ENGINEERING
(AUTONOMOUS UNDER VTU)
STACK PROJECT SYNOPSIS
AS PART OF II-III YEAR PROJECT
(2011 – 12)
CONTROL OF ELECTRICAL
APPLIANCES THROUGH TV REMOTE
GUIDE: M K VISHWANATH
Submitted By:
ASHIK PAI
SHIVA KUMAR G
SUHAS S
UDAYA KULALA G
YASHAS M V
4NI10EC009
4NI11EC410
4NI10EC054
4NI10EC056
4NI10EC062
Estd: 1946
`
DEPARTMENT OF ELECTRONICS AND
COMMUNICATION (E & C) ENGINEERING,
Mysore –570 008.
SYNOPSIS (Project Overview):
For convenient automatic control of some of the domestic appliances
like fan, light etc., TV remote control can be employed. This reduces the
burden of manual operation of devices. This project envisages automatic
control of domestic appliances. T h e appliances can be switched on/off
using TV remote without actually going near the switch boards or
regulators.
The TV remote used in this project is Infra Red(IR)type.
Ot h e r l o a d s l i k e e l e c t r o n i c a p p l i a n c e s , p o we r
c o n t r o l l i n g s ys t e m e t c . , c a n a l s o be controlled using this
principle. El e c t r i c a l l o a d s c a n e a s i l y b e c o n t r o l l e d a t a t i me
f r o m a c e n t r a l l o c a t i o n ( c o n t r o l r o o m) without having any physical
connection between loads and control room.
The principle of operation of this project is that when a button is pressed
in the TV remote, the signal is transmitted which is received by the IR
receiver in the sensing device. This signal is suitably processed
through an input interface circuit (frequency to voltage converter and
ADC).The processed signal is then sent to a microcontroller wh i c h
d e c o d e s t h e s i g na l a n d p e r f o r ms t h e c o r r e s p o n d i n g a c t i o n i n
a c c o r d a n c e wi t h t h e b u t t o n p r e s s e d i n t h e T V r e mo t e .
F o r e x a mp l e , i f number 1 button on the remote is pressed, the
load 1 say a lamp will be switched on/off according to the user`s
requirement. Other tasks will be performed similarly.
This project uses a 5V, 500mA regulated power supply. Three
terminal voltage regulator type 7805 is used for voltage regulation.
Bridge type f u l l wa v e r e c t i f i e r i s u s e d t o r e c t i f y t h e a c o u t p u t
o f s e c o n d a r y o f 230/12V step down transformer. The programming
language used for developing the software for the microcontroller is
Embedded C/Assembly. The KEIL cross compiler is used to edit, compile
and debug the program. Micro Flash programmer is used for burning the
developed code on Keil on to the microcontroller c h i p . AT8 9 C 5 1
mi c r o c o n t r o l l e r which is a Flash Programmable IC is employed in
this project. AT represents the Atmel Corporation and CMOS
technology is used for designing the IC. This IC is one of the versions
of 8051.
Objective:
Th e main ai m o f th is emb edd ed app lication is to
con trol electrical appliances using TV Remote.
TV REMOTE
(IR TRANSMITTER)
IR RECIEVER
(SENSOR)
AGC AND
BAND PASS
FILTER
CIRCUITS
DEMODULATOR
CIRCUIT
TSOP 1738
RELAY CIRCUITS
(SWITCHES) AND
CONTROLLING
ELEMENTS
MICRO
CONTROLLER
AT89S52
ANALOG TO
DIGITAL
CONVERTOR
(ADC)
ST 3659
LOAD
BLOCK DIAGRAM SHOWING CONTROL OF
ELECTRICAL APPLIANCES THROUGH
TV REMOTE
SOFTWARE DESCRIPTION
Processed TV remote signal will be made available at the at one
of the ports of the microcontroller. The microcontroller checks the
key pressed and performs the desired operation according to the
program written in it by the user.
The programming language used for developing the software
for the microcontroller is Embedded C/Assembly. The KEIL cross compiler
is used to edit, compile and debug the program. Micro Flash programmer is
used for burning the developed code on Keil on to the microcontroller c h i p .
A T8 9 C 5 1 mi c r o c o n t r o l l e r which is a Flash Programmable IC is
employed in this project. AT represents the Atmel Corporation and
CMOS technology is used for designing the IC. This IC is one of the
versions of 8051.
HARD WARE DESCRIPTION
1. TV REMOTE:
A remote control is a component of an electronic device, most commonly a
television, used for operating devices wirelessly from a short distance.
2. Sensor:
A sensor (also called detector) is a device that measures a measurable
attribute and converts it into a signal which can be read by an observer or by an
instrument.
3. Infra Red(IR) RECEIVER :
The TSOP17... – Series are miniaturized receivers for infrared remote control
systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is
designed as IR filter.
The demodulated output signal can directly be decoded by a microprocessor. TSOP17.. is
the standard IR remote control receiver series, supporting all major transmission codes.
4. Switching Transistor:
A transistor is a semiconductor device used to amplify and switch electronic signals
and power. It is composed of a semiconductor material with at least three terminals for
connection to an external circuit. A voltage or current applied to one pair of the transistor's
terminals changes the current flowing through another pair of terminals. Because the
controlled (output) power can be much more than the controlling (input) power, a transistor
can amplify a signal. Today, some transistors are packaged individually, but many more are
found embedded in integrated circuits.
5. RELAY:
A relay is an electrical switch that opens and closes under control of another electrical
circuit. In the original form, the switch is operated by an electromagnet to open or close
one or many sets of contacts.. Because a relay is able to control an output circuit of higher
power than the input circuit, it can be considered, in a broad sense, to be a form of
electrical amplifier.
6. POWER SUPPLY:
The input to the circuit is applied from the regulated power supply. The a.c. input i.e.,
230V from the mains supply is step down by the transformer to 12V and is fed to a
rectifier. The output obtained from the rectifier is a pulsating d.c voltage. So in order to get
a pure d.c voltage, the output voltage from the rectifier is fed to a filter to remove any a.c
components present even after rectification. Now, this voltage is given to a voltage
regulator to obtain a pure constant dc voltage
7. Analog to Digital Converters (ADC):
Temperature, sound, light intensity, color, liquid or gas flow, position and
speed are all examples physical parameters that may be used by a micro controller. These
data are first converted to a voltage or current waveform using appropriate transducers. It is
then the function of the ADC to convert the voltage or current to digital form for
processing by the microprocessor. There are different types of ADC’s and the
choice depends on the required accuracy, sampling rate and cost.
Process Flow:
The control of electrical appliances through TV remote can be achieved as
follows. The IR signals emitted by the remote is sensed by the receiver TSOP1738. This is
a high sensitive IR receiver which can sense 38 KHz IR light. The Signals received from
the TV remote have variable frequency depending on the button pressed. These signals
received by the receiver is first amplified and converted into a corresponding analog
voltage. This operation is performed by the IC TSOP 1738. This analog voltage is
converted to digital form by the ADC and then this digital information is sent as the input
to the microcontroller. The microcontroller performs the desired action according to the
button pressed in the remote. The output of the microcontroller is given to a relay driver
through a switching transistor circuit for turning on the relay. The common point of the
relay is connected to the supply voltage 230V, 50Hz and different resistances are connected
to the normally closed (NC) point so that current delivered to the load is varied. The load
can be a pedestal fan, a lamp etc.,
Advantages:

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Highly sensitive
Coverage distance up to 10m
Low cost and reliable circuit
Can handle heavy loads up to 7A
System can be switched into manual mode whenever required.
Applications:
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Home appliance control
Hotel lights/fan control
Shops and Showrooms
Industrial Applications
Electronic toys