21-10-2016, 10:53 AM
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ABSTRACT
In this system to show the transmission of sound numeric data (0-9,*, #) and image using visible light communication is performed.
The DTMF toner and a microphone are used
as an input selectively through a multi way switch and a speaker and an LCD display are used as outputting device.
The medium which binds the transmitter end to the receiver end is an LED source or the visible light communication.
INTRODUCTION
LIFI is coined as a 5G technology which is MIMO visible light communication network which uses LEDs
The current technologies which employ WIFI defines it as any wireless local area network (WLAN) products that are based
LIFI is thought of as an alternative or an exchange to the currently used WIFI
Visible light is defined as having a wavelength in range of 400 nanometers to 700 nanometers, which pros to have 10,000 times broader spectrum than the radio wave spectrum employed in WIFI
EXISTING SYSTEM
In a existing system RF signal based communication is used
So antenna is used for transmitting and receiving is used
RF communication is many standard like Bluetooth, Wi-Fi etc
In devices radiate the RF energy and communicate to all devices
Modulation and demodulation are used
DISADVANTAGES
It’s hazard signal
Radiation affect all people
small animal are severely affect
It’s causes some disease like cancer and tumor
All electronic gadget used these type of communication
Interference is high
EXPLANATION
All type of input is converted into binary form and encoded for transmission
That data as a pulse generated by micro controller
The transmission device as LED
The receiving device is photo detector that receive the data
Data is decoded and converted into original form
DIFFERENCE
In a existing system
RF signal based communication is used
Modulation and demodulation are used
In a proposed system
light signal based communication
encoder & decoder are used
ADVANTAGES
Advantage of not needing any base stations
Primarily requiring unlicensed services.
Very high data rates can be achieved due to low interference, high device bandwidths
High intensity optical output
It is non-hazardous and a safe technology which can even be employed in riverbeds and is cost effective.
APPLICATION
Relief from RF Spectrum
Smart Lights
Mobile Connectivity
Hospital & Healthcare
Aviation
HARDWARE REQUIREMENT
Keypad
Microcontroller
Led
Photo detector
LCD
HARDWARE EXPLANATION
MODULES DESCRIPTION
AT89C51 MICROCONTROLLER
low-power
high-performance CMOS 8-bit microcomputer with 4 Kbytes of Flash Programmable Erasable Read Only Memory (PEROM).
128 x 8-Bit Internal RAM
32 Programmable I/O Lines
Two 16-Bit Timer/Counters
STEP DOWN TRANSFORMER
step down transformer is used to step down the voltage to 12 v.
In step down transformer number of secondary turn is low compare to primary turn.
BRIDGE RECTIFIER
The conversion of an alternating current(AC) input into a direct current(DC) output, it is known as a bridge rectifier.
A bridge rectifier provides full-wave rectification from a two-wire AC input, resulting in lower cost and weight
VOLTAGE REGULATOR
A voltage regulator is designed to automatically maintain a constant voltage level.
LED
A light emitting diode (LED) is essentially a PN junction opto-semiconductor that emits a monochromatic (single color) light when operated in a forward biased direction.
LEDs convert electrical energy into light energy.
Conts…
The most important part of a light emitting diode (LED) is the semi-conductor chip located in the center of the bulb as shown at the right.
The chip has two regions separated by
a junction.
The junction acts as a barrier to the flow
of electrons between the p and the n regions.
PHOTO DETECTOR
The Photo Detector is a sensor of light and electromechanical
energy.
It works in forward bias by absorbing light.
the photo detector absorbs light from the light emitting diode.
The photo detector picks up the signal which is converted back into a data stream and sent to the client.
The client can communicate through its own LED output or over the existing network.
LIQUID CRYSTAL DISPLAY
LCD is an electronic visual display which uses light
modulating properties of liquid crystals as they do not emit directly.
It is capable of displaying fixed and flat images.
The LCD used is 2x16 grids in dimension.
It displays the data of highway routes from the microcontroller into readable form by parallel communication.
KEIL C
Compilers are programs used to convert a High Level Language to object code.
Embedded C is a set of language extensions for the C Programming language by the C Standards committee to address commonality issues that exist between C extensions for different embedded systems.
PROTEUS
Proteus is a software package for computer-aided design, simulation and design of electronic circuits.
The ISIS, ( Intelligent Switching input system ) is the environment for the design and simulation of electronic circuits.
The component library includes claims to more than 10,000 circuit components with 6000 keil c simulation models.
Own components can be created and added to the library.