A and controlling appliances of home remotely using GSM

                 A GSM based digital notice board and  a  home
automation  system has a    very
low cost of installation and maintenance. GSM SIM900 is the most popular
standard for mobiles in the world. It presents an SMS based notice board
incorporating the widely used GSM to facilitate the communication of displaying
message on notice board via user’s mobile phone. When the user sends a SMS via
a registered number from his mobile phone, it is received by SIM300 GSM modem
at the receiver’s end. If the user wants to display any message, he can send
the information by SMS and thus update the LCD display accordingly. The  
system consists of a 32-bit ARM  
based   microcontroller   LPC2148,  
GSM SIM900 module,   an LCD, a
motor   and   an android  
application   for   user  
interface    with   the  
hardware.

Keywords:

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1. Introduction

               Every system is automated in
order to face new challenges in the present day situation. Automated systems
have less manual operations, so that the flexibility, reliabilities are high
and accurate. Hence every field prefers automated control systems. Especially
in the field of electronics automated systems are doing better performance
increasingly. Probably the most
useful thing to know about the global system for mobile communication is that
it is an international standard. If you travel in parts of world, GSM is only
type of cellular service available. Instead of analog services, GSM was
developed as a digital system using TDMA technology. The main aim of this paper is to module GSM based wireless smart
home and digital notice board for the development of a system, which uses
Mobile technology that keeps monitoring of the various appliances, and will
control the operation of these appliances with respect to the signal sent by
the mobile. For utilization of appliances the new concept has been thought to
manage them remotely by using GSM, which enables the user to remotely control
switching of domestic appliances. Just by dialing keypad of remote telephone,
from where you are calling you can perform ON / OFF operation of the
appliances.

 

 

2. METHODOLOGY

            In this paper we are monitoring and
controlling appliances of home remotely using GSM technology. The required
operating voltage for Microcontroller 89C51 is 5V. Hence the 5V D.C. power
supply is needed by the same. This regulated 5V is generated by stepping down
the voltage from 230V to 12V using step down transformer. Now the step downed
a.c voltage is being rectified by the Bridge Rectifier using 1N4007 diodes. The
rectified a.c voltage is now filtered using a ‘C’ filter. Now the rectified,
filtered D.C. voltage is fed to the Voltage Regulator. This
voltage regulator provides/allows us to have a Regulated constant Voltage which
is of +5V. The rectified filtered and regulated voltage is again filtered for
ripples using an electrolytic capacitor 100?F. Now the output from this section
is fed to 40th pin of 89c51 microcontroller to supply operating
voltage.   The microcontroller 89C51 with Pull up
resistors at Port0 and crystal oscillator of 11.0592 MHz crystal in conjunction
with couple of 30-33pf capacitors  is
placed at 18th & 19th pins of 89c51 to make it work
(execute) properly. Operating voltage for the GSM modem will depends on its
type and an adaptor is provided with the GSM modem set itself. Now to monitor
and control the appliances of home, just we need to send a SMS from remote
telephone to the GSM modem which is present in home. Modem will read this SMS
and forwards to the microcontroller. Now the controller will process this data
and depending upon the message sent it will perform the action. Such that to
operate the lamps in the home controller will gives signals to the
corresponding relays to perform that action and to operate the DC Fan or DC
motor signal is to its respective drivers.

          Like this all the appliances in home can be
controlled by using this GSM technology. If we want to know the status of
appliances in home just a SMS is sent through the GSM modem via network paths
using AT commands to our mobiles which includes the status of the appliances.

3. GSM BASED SMART HOME AND DIGITAL
NOTICE BOARD

The
main aim of this paper GSM based wireless smart home and digital notice board is
to develop a system, which uses Mobile technology that keeps monitoring of the
various appliances, and will control the operation of these appliances with
respect to the signal sent by the mobile. For utilization of appliances the new
concept has been thought to manage them remotely by using GSM, which enables
the user to remotely control switching of domestic appliances. Just by dialing
keypad of remote telephone, from where you are calling you can perform ON / OFF
operation of the appliances. The block diagram of the proposed approach is
shown in Figure 1 and it consists of Microcontroller, MAX 232, GSM, LCD
display, power supply, relay, driver, fan and bulbs.