seminars topic on cellular through remote control switch

[sruthi]

Abstract This paper demonstrates a novel method which
enable users to control their home appliances and systems from
remote using a cell phone-based interface. To access the
control unit, the user should send an authentication code
(DTMF) along with the required/desired function/action to
his/her home control system via Global Sytem for Mobile
communication(GSM). Upon being properly authenticated, the
cell phone-based interface at home (control unit) would relay
the commands to a microcontroller that would perform the
required function/action, and return a function completion code
that would be sent to the source of the original command (user s
cell phone).
Index Term Decoder, DTMF, GSM, HACS,
Microcontroller.
I. INTRODUCTION
The aim of the proposed system is to develop a cost effective
solution that will provide controlling of home appliances
remotely and enable home security against intrusion in the
absence of homeowner. The system provides availability due
to development of a low cost system. The home appliances
control system with an affordable cost was thought to be built
that should be mobile providing remote access to the
appliances and allowing home security. Though devices
connected as home and office appliances consume electrical
power. These devices should be controlled as well as turn on
/off if required. Most of the times it was done manually. Now it
is a necessity to control devices more effectively and
efficiently at any time from anywhere. In this system, we are
going to develop a cellular phone based home/office appliance
controller , . This system is designed for controlling
arbitrary devices, it includes a cell phone (not included with
the system kit, end user has to connect his/her cell phone to
the system) which is connect to the system via head set. To
active the cellular phone unit on the system a call is to be made
and as the call is answered, in response the user would enter a
two/three digit password to access the system to control
devices. As the caller press the specific password, it results in
turning ON or OFF specific device. The device switching is
achieved by Relays . Security preserved because these
dedicated passwords owned and known by selected persons
only. For instance, our system contains an alarm unit giving
the user a remote on/off mechanism, which is capable of
informing up to five
different numbers over telephony network about the nature of
the event .
II. SYSTEM DEVELOPMENT
In this system we developed the overall method in two way.
First one is that the targeted devices can be controlled by
sending DTMF (dual tone multi frequency) sent by user
.Another way is that targeted devices can be controlled by
voice messages.
A. Block Diagram
Fig. 1. Block diagram of the system using DTMF.
In this system, there is a control unit/module. The control unit
is able to connect to the cellular network automatically, to
receive DTMF and will be able to decode for password
identification and instructions to be sent to the microcontroller.
The microcontroller within the control unit will issue the
command to the electrical appliances through a simple control
circuit.