THE USE OF GSM NETWORK TO MONITOR AND CONTROL
HOME APPLIANCES THROUGH SMS
GOVINDARAJU.M.P1, BASAVARAJ.U.K,2 CHANDRIKA.M.K3 ,VINAYAK.S.K4, MANJUNATH.S.C5,
1
U.G STUDENT, EEE DEPT, SJMIT, CHITRADURGA, KARNATAKA, INDIA
U.G STUDENT, EEE DEPT, SJMIT, CHITRADURGA, KARNATAKA, INDIA
3
U.G STUDENT, EEE DEPT, SJMIT, CHITRADURGA, KARNATAKA, INDIA
4
U.G STUDENT, EEE DEPT, SJMIT, CHITRADURGA, KARNATAKA, INDIA
5
ASSISTANT PROF, DEPARTMENT OF EEE, SJMIT, CHITRADURGA, KARNATAKA, INDIA
2
1
Manjusc69@gmail.com,
Abstract
This Paper represents the emerging application
of the GSM technology. Using the public GSM network a
home/industrial automation system has been proposed
and designed. A standalone embedded system is been
designed in such a way that it can monitor and control the
home /industrial appliances. This system uses the built in
input and output peripherals that allow the owner to
monitor and control the home appliances from mobile
phone set by sending command in the form of sms
messages and receiving the status of the appliances. The
GSM modem provides the communication between the
owner and the embedded system by means of a sms.
Keywords:GSM,Automationcontrol,mobile
phone,sms.
I.INTRODUCTION
A GSM based embedded System which
implements the emerging applications of the GSM
technology. Using GSM network, an embedded
system has been proposed that will act as a system
which can monitor and control home/industrial
appliances and other devices remotely using built-in
input and output peripherals. Remotely the system
allows the user to effectively monitor and control the
home/industrial appliances and equipment’s through
the mobile phone set by sending commands in the
form of SMS messages and receiving the appliances
status. The main concept behind this paper is
receiving the sent SMS and processing it further as
required to perform several operations. The necessary
operation to be performed depends on the nature of
the SMS sent. The principle on which the system
works is very simple. First, the sent SMS is stored
and polled from the receiver mobile station and then
the required control signal is generated and sent to
the intermediate hardware that we have designed.
According to the command received in form of the
sent message, these messages are sent from the
mobile set that contain commands in written form
which are then processed accordingly to perform the
required task.
II.SYSTEM MODEL
III THE SYSTEM DESCRIPTION AND
METHODOLOGY
The figure shown is the simple block
diagram. It is a simple illustration of how we have
implemented the proposed design and the various
parts involved in it. From the above representation,
first mobile station is used as a transmitting section
from which the subscriber sends text messages that
contain commands and instructions to the second
mobile station which is based on a specific area
where our control system is located. The received
SMS message is stored in the SIM memory of the
phone and then extracted by the microcontroller and
processed accordingly to carry out specific
operations. The LCD is used to indicate the status of
the operation performed by the microcontroller and
also its inclusion makes the overall system userfriendly. The input from different sensors are feed to
micro-controller and processed to operate respective
task semi autonomously and autonomously. The
system has a gsm interface to send and receive sms
message. The system is equipped with relays for
controlling power to devices. When the operator
sends a command to change the device status it
reaches the system in the form of sms message the
system then reads the sms message and device status
setting. The message will then be deleted and the
device status is changed accordingly.
IV. PREVIOUS WORK
[1] Mahesh N. Jivani et al author proposed paper
on“GSM Based Home Automation System Using
App-Inventor for Android Mobile Phone” with an
idea the remote Home Automation turns out to be
more and more significant and appealing. It improves
the value of our lives by automating various electrical
appliances or instruments. This paper describes GSM
(Global System Messaging) based secured device
control system using App Inventor for Android
mobile phones. App Inventor is a latest visual
programming platform for developing mobile
applications for Android-based smart phones.
The Android Mobile Phone Platform
becomes more and more popular among software
developers, because of its powerful capabilities and
open architecture. It is a fantastic platform for the
real world interface control, as it offers an ample of
resources and already incorporates a lot of sensors.
No need to write programming codes to develop apps
in the App Inventor, instead it provides visual design
interface as the way the apps looks and use blocks of
interlocking components to control the app’s
behaviour. The App Inventor aims to make
programming enjoyable and accessible to novices.
COMPONENTS USED
1. Microcontroller - P89V51RD2 – Phillips.
2. GSM Module
3. Alphanumeric Display
4. Relays
5. Power Supply
MICROCONTROLLER- P89V51RD2
The
P89V51RD2
is
an
80C51
microcontroller with 64 kB Flash and 1024 bytes of
data RAM. A key feature of the P89V51RD2 is its
X2 mode option. The design engineer can choose to
run the application with the conventional 80C51
clock rate (12 clocks per machine cycle) or select the
X2 mode (6 clocks per machine cycle) to achieve
twice the throughput at the same clock frequency.
Another way to benefit from this feature is to keep
the same performance by reducing the clock
frequency by half, thus dramatically reducing the
EMI. The Flash program memory supports both
parallel programming and in serial In-System
Programming (ISP). Parallel programming mode
offers gang-programming at high speed, reducing
programming costs and time to market. ISP allows a
device to be reprogrammed in the end product under
software control. The capability to field/update the
application firmware makes a wide range of
applications possible. The P89V51RD2 is also InApplication Programmable (IAP), allowing the Flash
program memory to be reconfigured even while the
application is running.
FEATURES:
 80C51 Central Processing Unit
 5 V Operating voltage from 0
to 40 MHz

64 kB of on-chip Flash
program memory with ISP (InSystem Programming) and IAP
(In-Application Programming)

Supports 12-clock (default) or
6-clock mode selection via
software or ISP

SPI
(Serial
Peripheral
Interface) and enhanced UART
Figure: Liquid crystal display

PCA (Programmable Counter
Array) with PWM and
Capture/Compare functions

Four 8-bit I/O ports with three
high-current Port 1 pins (16
mA each)

Three 16-bit timers/counters

Programmable
timer (WDT)

Eight interrupt sources with
four priority levels

Second DPTR register

Low EMI mode (ALE inhibit)

TTL- and CMOS-compatible
logic levels


LCD (Liquid Cristal Display):
Watchdog
ESD Protection Exceeds JESD 22 – 2000-V
Human-Body Model (A114-A)
Applications
o TIA/EIA-232-F
o Battery-Powered Systems
o Terminals
o Modems
o Computers
A liquid crystal display (LCD) is a thin, flat
display device made up of any number of color or
monochrome pixels arrayed in front of a light source
or reflector. Each pixel consists of a column of liquid
crystal molecules suspended between two transparent
electrodes, and two polarizing filters, the axes of
polarity of which are perpendicular to each other.
Without the liquid crystals between them, light
passing through one would be blocked by the other.
The liquid crystal twists the polarization of light
entering one filter to allow it to pass through the
other.A program must interact with the outside world
using input and output devices that communicate
directly with a human being. One of the most
common devices attached to an controller is an LCD
display. Some of the most common LCDs connected
to the controllers are 16X1, 16x2 and 20x2 displays.
This means 16 characters per line by 1 line 16
characters per line by 2 lines and 20 characters per
line by 2 lines, respectively.
Many microcontroller devices use 'smart LCD'
displays to output visual information. LCD displays
designed around LCD NT-C1611 module, are
inexpensive, easy to use, and it is even possible to
produce a readout using the 5X7 dots plus cursor of
the display. They have a standard ASCII set of
characters and mathematical symbols. For an 8-bit
data bus, the display requires a +5V supply plus 10
I/O lines (RS RW D7 D6 D5 D4 D3 D2 D1 D0).
For a 4-bit data bus it only requires the supply lines
plus 6 extra lines(RS RW D7 D6 D5 D4). When the
LCD display is not enabled, data lines are tri-state
and they do not interfere with the operation of the
microcontroller.
av
Lin
len
8,
24
40
ch
are
sta
in
FEATURES:













Interface with either 4-bit or 8-bit
microprocessor.
Display data RAM
80x8 bits (80 characters).
Character generator ROM
160 different 57 dot-matrix character
patterns.
Character generator RAM
8 different user programmed 57 dotmatrix patterns.
Display data RAM and character
generator RAM may be Accessed by
the microprocessor.
Numerous instructions
.Clear
Display, Cursor
Home,
Display ON/OFF, Cursor ON/OFF,
Blink
Character, Cursor
Shift,
Display Shift.
Built-in reset circuit is triggered
at power ON.
Built-in oscillator.
RELAY
relay satisfactorily. To enable this, a driver circuitry,
which will act as a buffer circuit, is to be
incorporated between them. The driver circuitry
senses the presence of a “high” level at the input and
drives the relay from another voltage source. Hence
the relay is used to switch the electrical supply to the
appliances. From the figure when we connect the
rated voltage across the coil the back emf opposes the
current flow but after the short time the supplied
voltage will overcome the back emf and the current
flow through the coil increase. When the current is
equal to the activating current of relay the core is
magnetized and it attracts the moving contacts.
Now the moving contact leaves from its
initial position denoted “(N/C)” normally closed
terminal which is a fixed terminal. The common
contact or moving contact establishes the connection
with a new terminal which is indicated as a normally
open terminal “(N/O)”.Whenever, the supply coil is
withdrawn the magnetizing force is vanished. Now,
the spring pulls the moving contact back to initial
position, where it makes a connection makes with
N/C terminal. However, it is also to be noted that at
this time also a back emf is produced. The
withdrawal time may be in microsecond, the back
emf may be in the range of few kilovolts and in
opposite polarity with the supplied terminals the
voltage is known as surge voltage. It must be
neutralized or else it may damage the system.
RELAY DRIVER
NC: - Normally Connected
NO: - Normally Open
COM: - Common
Figure: Relay Switch Connections
The relay driver is used to isolate both the
controlling and the controlled device. The relay is an
electromagnetic device, which consists of solenoid,
moving contacts (switch)and restoring spring and
consumes comparatively large amount of power.
Hence it is possible for the interface IC to drive the
A ULN2803 is an integrated circuit (IC)
chip with a high voltage/high current Darlington
Transistor Array. It allows you to interface TTL
signals with higher voltage/higher current loads. The
chip takes low level signals (TTL, CMOS, PMOS,
NMOS-which operate at low voltages and low
current) and acts as a relay of sorts itself, switching
ON/OFF a higher level signal on the opposite side. A
TTL signal operates from 0-5v, with everything
between 0.0-0.8V considered “low” or OFF, and 2.25.0V being considered “high” or ON. The maximum
power available on a TTL signal depends on the type,
but generally does not exceed 25mW (~5mA at 5V),
so it is not useful for providing power to something
like a relay coil. Computers and other electronic
devices frequently generate TTL signals. On the
output side the ULN2803 is generally rated at
50V/500mA, so it can operate small loads directly.
Alternatively it is frequently used to power the coil of
one or more relays, which in turn allow even higher
voltages/currents to be controlled by the low level
signals.
POWER SUPPLY CIRCUIT DIAGRAM
V.CONCLUSION
With the help of a simple cell phone, a user
is able to control and monitor virtually any electrical
devices. This makes it possible for users to rest
assured that their belongings are secure and that the
television and other electrical appliances was not left
running when they left the house to just list a few of
the many uses of this system. The end product will
have a simplistic design making it easy for users to
interact with. This will be essential because of the
wide range of technical knowledge that homeowners
have.
VI. FUTURE SCOPE
Figure : Power supply
BRIDGE RECTIFIER
A bridge rectifier can be made using four
individual diodes, but it is also available in special
packages containing the four diodes required. It is
called a full-wave rectifier because it uses all the AC
wave (both positive and negative sections). 1.4V is
used up in the bridge rectifier because each diode
uses 0.7V when conducting and there are always two
diodes conducting, as shown in the diagram below.
Bridge rectifiers are rated by the maximum current
they can pass and the maximum reverse voltage they
can withstand (this must be at least three times the
supply RMS voltage so the rectifier can withstand the
peak voltages). Please see the Diodes page for more
details, including pictures of bridge rectifiers. After
the bridge rectifier output we will get the DC output
5V and 12V by using the voltage regulator the
required voltage for the microcontroller can be taken.
The future implications of this paper are
very great considering the amount of time and
resources it saves. The design we have undertaken
can be used as a reference or as a base for realizing a
scheme to be implemented in other designs of greater
level such as weather forecasting, Temperature
updates, device synchronization, etc. The paper itself
can be modified to achieve a complete Home
Automation System which will then create a platform
for the user to interface between himself and his
household. The concept can be used in fields such as
remote sensing, robotics, aeronautics, home
automation and many other related fields where
continuous monitoring and regulation is needed.
REFERENCES
1. Mahesh N. Jivani Associate Professor, Department
of Electronics, Saurashtra University, Rajkot,
Gujarat, India “GSM Based Home Automation
System Using App-Inventor for Android Mobile
Phone” International Journal of Advanced Research
in Electrical, Electronics and Instrumentation
Engineering (An ISO 3297: 2007 Certified
Organization) Vol. 3, Issue 9, September 2014
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Uche,
"Can
Android
App
Inventor
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BIOGRAPHY
[1]
[2]
[3]
[4]
U.G STUDENTS, EEE DEPT, SJMIT,
CHITRADURGA, KARNATAKA, INDIA
[5]
Manjunath S C Working as Assistant Professor
Dept of EEE, SJMIT, Chitradurga, Karnataka,
India. He has completed B.E(EEE) in 2008 and
M.tech (Power System & Power Electronics) in
2010. Areas of interest are power system, power
Electronics Industrialdrives Electrical machines.