Design And Construction Of A Bluetooth Based Speaker With Microphone Port And MP3

Electrical Electronics Engineering | Industrial Physics | Physics

The design and construction of a Bluetooth-based speaker with a microphone port and MP3 functionality represent a sophisticated fusion of audio technology. This innovative audio device seamlessly incorporates wireless connectivity through Bluetooth, enabling users to effortlessly stream audio from various compatible devices. The inclusion of a microphone port enhances the speaker’s versatility, catering to a diverse range of applications, from hands-free calling to karaoke sessions. The integration of MP3 functionality further amplifies its utility, allowing users to directly play music from external sources. This speaker embodies a harmonious convergence of wireless communication, audio amplification, and input flexibility, delivering a cutting-edge audio experience that adapts to modern connectivity needs.

Speaker with Bluetooth microphone port and mp3 stereo audio system—one that’s also fairly low-cost—for outdoor use. This device provides the easiest way to play music off your smartphone to a speaker unit. The system, which maintains 20-WRMS output power, can be controlled either with a handset containing a Bluetooth connection and a music player or with an Apple iPod model. Bluetooth technology, created in the late 1990s, is widely used to establish a short-range wireless connection between two handheld mobile devices. A Bluetooth setup also makes it possible to transfer a stereo audio signal from a handheld device to a speaker unit which is the aim of this project.

TABLE OF CONTENTS

COVER PAGE

TITLE PAGE

APPROVAL PAGE

DEDICATION

ACKNOWELDGEMENT

ABSTRACT

CHAPTER ONE

INTRODUCTION

1.1 BACKGROUND OF THE PROJECT

PROBLEM STATEMENT
OBJECTIVE OF THE PROJECT
SIGNIFICANCE OF THE PROJECT
LIMITATION OF THE PROJECT
SCOPE OF THE PROJECT
APPLICATION OF THE PROJECT
METHODOLOGY
BLOCK DIAGRAM
PROJECT ORGANISATION

CHAPTER TWO

LITERATURE REVIEW

REVIEW OF BLUETOOTH TECHNOLOGY
ORIGIN OF BLUETOOTH
ETYMOLOGY OF BLUETOOTH
IMPLEMENTATION OF BLUETOOTH
COMMUNICATION AND CONNECTION
USES OF BLUETOOTH

CHAPTER THREE

SYSTEM DESIGN

BLUETOOTH BASICS
BLOCK DIAGRAM OF THE SYSTEM
OUTPUT POWER OF THE WORK
SELECTING THE BLUETOOTH HEADSET, ON/OFF SWITCH, AND LEDS
BUILDING SYSTEM

CHAPTER FOUR

TESTING AND RESULTS

CONSTRUCTION PROCEDURE AND TESTING
INSTALLATION OF THE COMPLET DESIGN
CASING AND PACKAGING
ASSEMBLING OF SECTIONS
TESTING OF SYSTEM OPERATION
ASSEMBLING THE SYSTEM
TESTING OF THE SYSTEM
PROBLEM ENCOUNTERED
COST ANALYSIS
PRECAUSIONS

CHAPTER FIVE

CONCLUSION
RECOMMENDATION
REFERENCES

CHAPTER ONE

1.0 INTRODUCTION

1.1 BACKGROUND OF THE PROJECT

Bluetooth technology, created in the late 1990s, is widely used to establish a short-range wireless connection between two handheld mobile devices. A Bluetooth setup also makes it possible to transfer a stereo audio signal from a handheld device to a wireless headset.

That’s the most elementary and primary component of any Bluetooth speaker on the market. Beyond that there are dozens of big and small variables that distinguish (or fail to distinguish) different Bluetooth speaker makes and models from one another.

Bluetooth speakers are different from Wi-Fi based audio solutions, like the whole-house Sonos system, in several key ways. First, Bluetooth solutions are typically meant to be highly portable whereas whole-house solutions are usually installed permanently or semi-permanently in fixed locations.

Second, Bluetooth speakers and microphone link directly to their source (usually a phone or tablet) and require no intermediary whereas whole-house solutions require the Wi-Fi network to bridge the source and the devices. This also allows whole-house networks to broadcast the same music stream to multiple and distance speakers, however, a feature impractical for Bluetooth speakers that have a roughly 30 foot range.

Finally audio quality is slightly higher on Bluetooth systems than on Wi-Fi systems (all other variables the same) simply because of the nature of the transmission; practically speaking this is a non-consideration; however, as under casual listening conditions the difference would be indiscernible to most.

Today’s speakers operate under the Bluetooth Class 2 specification with 2.5-mW (4 dBm) transmission power. A Bluetooth Class 2 module’s transmission range extends to about 10 meters.

1.2 PROBLEM STATEMENT

Under normal circumstances, speakers, mp3 player and microphone need a cable linking them to an audio source (be that cable a pair of speaker cables running to a full blown stereo system with an amp or just a simple 3.5 mm phono cable leading to an iPod).

Bluetooth speakers and microphone eschew this physical-cable limitation by relying on the same Bluetooth protocol and audio system that underlies Bluetooth wireless cellphone earpieces and in-car Bluetooth speakerphone systems.

1.3 OBJECTIVE OF THE PROJECT

The objective of this work is to design a system, which maintains 20-WRMS output power, can be controlled either with a handset containing a Bluetooth connection, microphone port and an mp3 music player through a Bluetooth module.

1.4 SIGNIFICANCE OF THE PROJECT

This system is a convenient way listen to music away from your computer, home stereo system, or car and you want to listen to music that is digitized (be it via streaming or files stored on your phone or tablet) then a Bluetooth speaker is pretty much exactly what you’re looking for: a portable speaker that links wirelessly to your phone, and it can also be used as a wireless public addressing system.

Bluetooth speakers and microphone are great when you want to take music to the beach, out on the back deck beyond the reach of your traditional stereo, or anywhere else you’d traditionally take a portable stereo.

Bluetooth powered home audio solutions that are meant to replace traditional stereo systems, bookshelf speakers, and other audio fixtures. The focus of this buying guide is on portable units that you can easily move around your house, take out to the yard, and beyond.

1.5 LIMITATION OF THE PROJECT

Bluetooth speakers have exploded in popularity, and are the easiest way to play music off your smartphone. The problem is the speakers are usually a bit small and the sound doesn’t quite fill a room.

This device connects the speakers and a 12-volt power supply is needed to drive everything. You’ll need a soldering iron and screwdriver to finish the connections.

1.6 SCOPE OF THE PROJECT

Wireless Bluetooth stereo audio system—one that’s also fairly low-cost—for outdoor use. The system, which maintains 20-WRMS output power, can be controlled either with a handset containing a Bluetooth connection and a music player or with an Apple iPod model. This system has:

1,000 mAh Rechargeable Li-ion Battery (9hrs Playback)
Dual 3W (4ohms) 35mm Neodymium Drivers
High Efficiency 2x3W Amplifier (0.1%THD)
15 meter Standard Bluetooth Range
5mm Auxiliary Ready
Mini USB Charge Plug
Microphone port
Mp3 player
- APPLICATION OF THE PROJECT

Various types of high-quality Bluetooth stereo headphones.
Various types of high-quality Bluetooth stereo speakers, stereo.

All kinds of high-quality wireless Bluetooth stereo audio receiver equipment.

In cars
As public addressing system

1.8 METHODOLOGY

To achieve the aim and objectives of this work, the following are the steps involved:

Study of the previous work on the project so as to improve it efficiency.
Draw a block diagram.

Test for continuity of components and devices,

Design and calculation for the device was carried out.
Studying of various component used in circuit.
Construction of the circuit was carried out.

Finally, the whole device was cased and final test was carried out.

3.3 BLOCK DIAGRAM OF THE SYSTEM

By connecting the audio signal from a Bluetooth headset to an external amplifier, it’s possible to amplify the signal. The Bluetooth stereo headset then acts as a bridge, delivering the audio signal from the handheld device to a stereo audio amplifier, creating a wireless mp3 stereo audio system. This system is based on a stereo Class D audio amplifier, which drives a pair of 4-Ω speakers. The block diagram of the system is as below:

1.10 PROJECT ORGANISATION

The work is organized as follows: chapter one discuses the introductory part of the work, chapter two presents the literature review of the study, chapter three describes the methods applied, chapter four discusses the results of the work, chapter five summarizes the research outcomes and the recommendation.