DESIGN AND IMPLEMENTATION OF MICROCONTROLLER BASED DTMF MULTIPLE DEVICES REMOTE CONTROL SYSTEM
By
Author
Presented To
Department of Electrical/Electronic Engineering
CHAPTER ONE
INTRODUCTION
1.1 General
This modern era, life without electronics is unimaginable. With the progressive
increase in the number of electronic gadgets, it becomes essential to design a remote
control system that can control a number of them at the same time. A remote control
system now finds a large number of crucial applications like controlling of artificial
satellites, manufacture of products by machines or in the control of chemical
reactions in dangerous plants from a distance. For the design of a remote control
system that controls the switching of multiple electronic devices at the same time,
DTMF tones have been used. The reason for the use of DTMF is that one can control
a maximum of twelve devices simultaneously by means of a single remote system
[1].
1.2 Problem Statement
Electrical appliances such as fans, air conditioners, motors, lighting systems, etc
needs to turn on and turn off. From a few decades, controlling devices using remote
control becomes common. Infrared and bluetooth technology are becomes common
in remote control. But these technologies have their own limitations, an infrared
signal to be detected must be a direct line of sight between the transmitter and the
receiver, if there is a wall or large object between them the signal do not pass through
it. IR does not penetrate walls and so does not interfere with other devices in
adjoining rooms. bluetooth technology uses a short radio frequency, which allows
transmission through walls and other objects but has lower distance range.
Technologies infrared and bluetooth remote control are used for short distance
applications. Hence need a system does not limitation of range it can be used from
anywhere.
1.3 Objectives
The main aims of this thesis are:
• Design of a system that controls a four devices via the mobile phone.
• Simulation of proposed system.
• Implementation and testing of proposed system.
.
1.4 Methodology
• Study of previews related works.
• Global system for mobile communication is used as main media for the system.
• The DTMF decoder is used to convert the analogue signal to digital signal.
• The Atmega16 microcontroller is programmed using BASIC language.
• System simulation is done by using Proteus software.
1.5 Thesis Layout
This thesis consists of five chapters including chapter one. chapter two gives
theoretical background and literature review including control system, global system
for mobile communication and microcontroller. chapter three discusses system
hardware and software considerations. chapter four describes system design,
implementation and testing. Finally chapter five handles conclusion and
recommendations
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