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07-04-2009, 11:38 PM
Post: #1
Led Wireless
Definition

Billions of visible LEDs are produced each year, and the emergence of high brightness AlGaAs and AlInGaP devices has given rise to many new markets. The surprising growth of activity in, relatively old, LED technology has been spurred by the introduction of AlInGaP devices. Recently developed AlGaInN materials have led to the improvements in the performance of bluish-green LEDs, which have luminous efficacy peaks much higher than those for incandescent lamps. This advancement has led to the production of large-area full-color outdoors LED displays with diverse industrial applications.

The novel idea of this article is to modulate light waves from visible LEDs for communication purposes. This concurrent use of visible LEDs for simultaneous signaling and communication, called iLight, leads to many new and interesting applications and is based on the idea of fast switching of LEDs and the modulation visible-light waves for free-space communications. The feasibility of such approach has been examined and hardware has been implemented with experimental results. The implementation of an optical link has been carried out using an LED traffic-signal head as a transmitter. The LED traffic light (fig 1 below) can be used for either audio or data transmission.
Audio messages can be sent using the LED transmitter, and the receiver located at a distance around 20 m away can play back the messages with the speaker. Another prototype that resembles a circular speed-limit sign with a 2-ft diameter was built. The audio signal can be received in open air over a distance of 59.3 m or 194.5 ft. For data transmission, digital data can be sent using the same LED transmitter, and the experiments were setup to send a speed limit or location ID information.

The work reported in this article differs from the use of infrared (IR) radiation as a medium for short-range wireless communications. Currently, IR links and local-area networks available. IR transceivers for use as IR data links are widely available in the markets. Some systems are comprised of IR transmitters that convey speech messages to small receivers carried by persons with severe visual impairments. The Talking Signs system is one such IR remote signage system developed at the Smith-Kettlewell Rehabilitation Engineering Research center. It can provide a repeating, directionally selective voice message that originates at a sign. However, there has been very little work on the use of visible light as a communication medium.

The availability of high brightness LEDs make the visible-light medium even more feasible for communications. All products with visible-LED components (like an LED traffic signal head) can be turned into an information beacon. This iLight technology has many characteristics that are different from IR. The iLight transceivers make use of the direct line-of-sight (LOS) property of visible light, which is ideal in applications for providing directional guidance to persons with visual impairments. On the other hand, IR has the property of bouncing back and forth in a confined environment. Another advantage of iLight is that the transmitter provides easy targets for LOS reception by the receiver. This is because the LEDs, being on at all times, are also indicators of the location of the transmitter. A user searching for information has only to look for lights from an iLight transmitter. Very often, the device is concurrently used for illumination, display, or visual signage. Hence, there is no need to implement an additional transmitter for information broadcasting. Compared with an IR transmitter, an iLight transmitter has to be concerned with even brightness. There should be no apparent difference to a user on the visible light that emits from an iLight device.

It has long been realized that visible light has the potential to be modulated and used as a communication channel with entropy. The application has to make use of the directional nature of the communication medium because the receiver requires a LOS to the audio system or transmitter. The locations of the audio signal broadcasting system and the receiver are relatively stationary. Since the relative speed between the receiver and the source are much less than the speed of light, the Doppler frequency shift observed by the receiver can be safely neglected. The transmitter can broadcast with viewing angle close to 180 . The frequency of an ON period followed by an OFF period to transmit information is short enough to be humanly unperceivable; so that it does not affect traffic control. This article aims to present an application of high-brightness visible LEDs for establishing optical free-space links.

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20-10-2009, 06:57 PM
Post: #2
RE: Led Wireless
i want the details on the topic LED WIRELESS
21-10-2009, 02:32 PM
Post: #3
RE: Led Wireless

.pdf  LED-wireless-LED.pdf (Size: 360.16 KB / Downloads: 939)
check http://www.scribd.com/doc/13141303/LED-Wireless for full presentation
A light-emitting diode (LED) is an electronic light source. LEDs are based on the semiconductor diode. LEDs present many advantages over traditional light sources including lower energy consumption, longer lifetime, improved robustness, smaller size and faster switching

LEDs IN Traffic light

The new traffic lights you are seeing are made out of arrays of light emitting diodes (LEDs). These are tiny, purely electronic lights that are extremely energy efficient and have a very long life

TRADITIONAL HALOGEN BULBS V/S LEDs HALOGEN BULBSLEDs
Max. lamp lifetime six months Big brightness loss after only 5000 hours Not uniform brightness Long distance visualization problems
Max. LED lifetime 10 years Brightness loss after 10,000 hours between 6% to 12% Uniform brightness Long distance better view

TRADITIONAL HALOGEN BULBS V/S LEDs CONTD¦ HALOGEN BULBS
LEDs
Delay of the bulb in the on/off Yearly interior and exterior cleaning of the Lamp

On/off cycle delay is negligible No interior cleaning is necessary

ADVANTAGES
High-speed operation are available at low cost. FCC licenses are not necessary Penetrate through glasses, but not through walls LED light beams follow a straight-line path and are well suited for the wireless delivery of large quantities of voice and data information High directional features of LEDs

DISADVANTAGES
Suitable for short range only Intensity modulation with direct detection seems the only practical transmission method. As a communication medium, it has limited range. It is subjected to noise arising from sunlight, incandescent lighting,and fluorescent lighting.

APPLICATIONS
IN TRAFFIC LIGHT IN TRAFFIC INFORMATION SYSTEM IN MUSEUM

IN TRAFFIC LIGHT
Low power consumption and minimal required maintenance. Safety Long term warranty

IN TRAFFIC NFORMATION SYSTEM
Traffic light can be used as an audio broadcasting device. A receiver some distance away pointing at the traffic light can receive voice messages. The message can announce the time until the next signal change. Voice message can tell the location or directional information.

IN MUSEUM
Information be broadcast via a plurality of LEDs. One can listen to the audio message about the specific exhibit item

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03-07-2010, 11:57 AM
Post: #4
RE: Led Wireless
i would like to do my mini project on led communication.... plhelp me with circuit
13-07-2010, 11:06 PM
Post: #5
RE: Led Wireless
PLEASE SEND ME FULL REPORT
14-07-2010, 09:23 PM
Post: #6
RE: Led Wireless
The report pad is posted in the above posts, Plaese download them and copy the posted material to make your report

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14-10-2010, 11:58 AM
Post: #7
Big Grin RE: Led Wireless

.pptx  LED WIRELESS.pptx (Size: 1.66 MB / Downloads: 139)
This article is presented by:MALAY RANJAN SAHU
[0711015024]
AE & I
LED WIRELESS




AlGaAs & AlGaInP are used in led to produce high brightness light. Recently developed AlInGaP materials have to produce bluish-green LEDs,has luminous efficacy peaks much higher than those for incandescent lamps …

The novel idea of this article is to modulate light waves emitted from visible LEDs & encoded with audio information for transmitting & broadcasting audio &digital information.



I LIGHT
This concurrent use of visible LEDs for simultaneous
signaling and communication, called iLight, leads to many new and interesting applications and is based on the idea of fast switching of LEDs and the modulation visible-light waves for free-space communications..

Audio messages can be sent using the LED transmitter, and the receiver
located at a distance around 20 m away can play back the messages with the
speaker. The audio signal can be received in open air over a distance of 59.3 m
or 194.5 ft.

LOS(LINE OF SIGHT)

All products with visible-LED components can be turned into an information beacon.
The iLight transceivers make use of the direct line-of-sight (LOS) property of visible light, which is ideal in
applications for providing directional guidance to persons with visual impairments.
iLight is that the transmitter provides easy targets for LOS reception by the receiver. This is because the LEDs being on at all times, are also indicators of the location of the transmitter.

A user searching for information has only to look for lights from an iLight transmitter..
there is no need to implement an additional transmitter for information broadcasting.
The locations of the audio signal broadcasting system
and the receiver are relatively stationary. Since the relative speed between the receiver and the source are much less than the speed of light, the Doppler frequency shift observed by the receiver can be safely neglected.
18-02-2011, 10:52 AM
Post: #8
RE: Led Wireless

.pdf  led-wireless.pdf (Size: 785.84 KB / Downloads: 170)
1. INTRODUCTION & BACKGROUND
Billions of visible LEDs are produced each year, and the emergence ofhigh brightness AlGaAs and AlInGaP devices has given rise to many new markets. Thesurprising growth of activity in, relatively old, LED technology has been spurred by theintroduction of AlInGaP devices. Recently developed AlGaInN materials have led to theimprovements in the performance of bluish-green LEDs, which have luminous efficacypeaks much higher than those for incandescent lamps. This advancement has led to theproduction of large-area full-color outdoors LED displays with diverse industrialapplications.The novel idea of this article is to modulate light waves from visible LEDsfor communication purposes. This concurrent use of visible LEDs for simultaneoussignaling and communication, called iLight, leads to many new and interestingapplications and is based on the idea of fast switching of LEDs and the modulationvisible-light waves for free-space communications. The feasibility of such approach hasbeen examined and hardware has been implemented with experimental results. Theimplementation of an optical link has been carried out using an LED traffic-signal headas a transmitter. The LED traffic light (fig 1 below) can be used for either audio or datatransmission. Audio messages can be sent using the LED transmitter, and the receiverlocated at a distance around 20 m away can play back the messages with the speaker.Another prototype that resembles a circular speed-limit sign with a 2-ft diameter wasbuilt. The audio signal can be received in open air over a distance of 59.3 m or 194.5 ft.For data transmission, digital data can be sent using the same LED transmitter, and theexperiments were setup to send a speed limit or location ID information.The work reported in this article differs from the use of infrared (IR)radiation as a medium for short-range wireless communications. Currently, IR links andlocal-area networks available. IR transceivers for use as IR data links are widely availablein the markets. Some systems are comprised of IR transmitters that convey speechmessages to small receivers carried by persons with severe visual impairments. TheTalking Signs system is one such IR remote signage system developed at the Smith-Kettlewell Rehabilitation Engineering Research center. It can provide a repeating,directionally selective voice message that originates at a sign. However, there has beenvery little work on the use of visible light as a communication medium.The availability of high brightness LEDs make the visible-light mediumeven more feasible for communications. All products with visible-LED components (likean LED traffic signal head) can be turned into an information beacon. This iLighttechnology has many characteristics that are different from IR. The iLight transceiversmake use of the direct line-of-sight (LOS) property of visible light, which is ideal inapplications for providing directional guidance to persons with visual impairments. Onthe other hand, IR has the property of bouncing back and forth in a confined environment.Another advantage of iLight is that the transmitter provides easy targets for LOSreception by the receiver. This is because the LEDs, being on at all times, are alsoindicators of the location of the transmitter. A user searching for information has only tolook for lights from an iLight transmitter. Very often, the device is concurrently used forillumination, display, or visual signage. Hence, there is no need to implement anadditional transmitter for information broadcasting. Compared with an IR transmitter, aniLight transmitter has to be concerned with even brightness. There should be no apparentdifference to a user on the visible light that emits from an iLight device.It has long been realized that visible light has the potential to be modulatedand used as a communication channel with entropy. The application has to make use ofthe directional nature of the communication medium because the receiver requires a LOSto the audio system or transmitter. The locations of the audio signal broadcasting systemand the receiver are relatively stationary. Since the relative speed between the receiverand the source are much less than the speed of light, the Doppler frequency shift observedby the receiver can be safely neglected. The transmitter can broadcast with viewing angleclose to 180. The frequency of an ON period followed by an OFF period to transmitinformation is short enough to be humanly unperceivable; so that it does not affect trafficcontrol. This article aims to present an application of high-brightness visible LEDs forestablishing optical free-space links.
08-03-2011, 03:27 PM
Post: #9
RE: Led Wireless

.doc  led-wireless.doc (Size: 1.81 MB / Downloads: 111)
INTRODUCTION
Billions of visible LEDs are produced each year, and
the emergence of high brightness AlGaAs and AlInGaP devices
has given rise to many new markets. The surprising growth of
activity in, relatively old, LED technology has been spurred by
the introduction of AlInGaP devices. Recently developed
AlGaInN materials have led to the improvements in the
performance of bluish-green LEDs, which have luminous
efficacy peaks much higher than those for incandescent lamps.
This advancement has led to the production of large-area full-
color outdoors LED displays with diverse industrial
applications.
The novel idea of this article is to modulate light
waves from visible LEDs for communication purposes. This
concurrent use of visible LEDs for simultaneous signaling and
communication, called iLight, leads to many new and interesting
applications and is based on the idea of fast switching of LEDs
and the modulation visible-light waves for free-space
communications. The feasibility of such approach has been
examined and hardware has been implemented with
experimental results. The implementation of an optical link has
been carried out using an LED traffic-signal head as a
LED Wireless
transmitter. The LED traffic light can be used for either audio
or data transmission.
Audio messages can be sent using the LED
transmitter, and the receiver located at a distance around 20 m
away can play back the messages with the speaker. Another
prototype that resembles a circular speed-limit sign with a 2-ft
diameter was built. The audio signal can be received in open air
over a distance of 59.3 m or 194.5 ft. For data transmission,
digital data can be sent using the same LED transmitter, and the
experiments were setup to send a speed limit or location ID
information.
The work reported in this article differs from the use
of infrared (IR) radiation as a medium for short-range wireless
communications. Currently, IR links and local-area networks
available. IR transceivers for use as IR data links are widely
available in the markets. Some systems are comprised of IR
transmitters that convey speech messages to small receivers
carried by persons with severe visual impairments. The Talking
Signs system is one such IR remote signage system developed at
the Smith-Kettlewell Rehabilitation Engineering Research
center. It can provide a repeating, directionally selective voice
message that originates at a sign. However, there has been very
little work on the use of visible light as a communication
medium.
LED Wireless
The availability of high brightness LEDs make the
visible-light medium even more feasible for communications.
All products with visible-LED components (like an LED traffic
signal head) can be turned into an information beacon. This
iLight technology has many characteristics that are different
from IR. The iLight transceivers make use of the direct line-of-
sight (LOS) property of visible light, which is ideal in
applications for providing directional guidance to persons with
visual impairments. On the other hand, IR has the property of
bouncing back and forth in a confined environment. Another
advantage of iLight is that the transmitter provides easy targets
for LOS reception by the receiver. This is because the LEDs,
being on at all times, are also indicators of the location of the
transmitter. A user searching for information has only to look
for lights from an iLight transmitter. Very often, the device is
concurrently used for illumination, display, or visual signage.
Hence, there is no need to implement an additional transmitter
for information broadcasting. Compared with an IR transmitter,
an iLight transmitter has to be concerned with even brightness.
There should be no apparent difference to a user on the visible
light that emits from an iLight device.
It has long been realized that visible light has the
potential to be modulated and used as a communication channel.
The application has to make use of the directional nature of the
communication medium because the receiver requires a LOS to
LED Wireless
the audio system or transmitter. The locations of the audio
signal broadcasting system and the receiver are relatively
stationary. Since the relative speed between the receiver and the
source are much less than the speed of light, the Doppler
frequency shift observed by the receiver can be safely neglected.
The transmitter can broadcast with viewing angle close to 180 .
This article aims to present an application of high-brightness
visible LEDs for establishing optical free-space links.
27-04-2011, 03:08 PM
Post: #10
RE: Led Wireless
SUBMITTED BY:-
RAVIRANJAN KU. SINGH


.pptx  RAVIRANJAN KUMAR SINGH SEMMINAR REPRASENTION.pptx (Size: 840.11 KB / Downloads: 64)
INTRODUCTION
 IN RECENT WORD THE NEW DEVLOPMENT IN COMMUNICATION WORLD THROUGH LED IS CALLED I-LIGHT.
 THIS LED TECNOLOGY IN COMMUNICATION IS USED BECAUSE OF HIGH LUMINOUS EFFICANCY OF LED DEVICE(LIKE AL-IN-GA-P),FAST SWITCHING AND MODULATION VISIBLE LIGHT WAVE FOR FERR SPACE COMMUNICATION.
PHOTO DETECTOR
 The photo detector circuit consists of a photo diode and a resistor. One end of the photo diode is coupled to the current limiting resistor with the other end coupled to the ground . The photo-detector is used to detect a light signal from the transmitter and convert it into an electrical signal. The limiting pre-amplifier is used to amplify the electrical signal from the photo-detector for the next stage. And it produce rectangular signal pulses
DATA REPRODUCING CIRCUIT
 The data reproducing circuit, which consists of an operational amplifier, a resistor, and two NAND Schmitt triggers is used.
 Its function is to produce rectangular pulses from the amplified signal in the previous stage.
 An operational amplifier is used as a comparator, which uses a virtual ground as a reference
 The NAND Schmitt trigger gates are used to enhance the noise immunity and to correct the edges from low to high voltage levels due to slew rate of the amplifier.
 Two NAND Schmitt trigger gates are used instead of one so that the signal will not be inverted.
DIFFERENTIATOR
 Then, a differentiator circuit consisting of a capacitor and a resistor is used to detect the leading edges of the pulse with the trailing edge blocked by the diode.
 A Schmitt trigger gate is used as a pulse generator, and the output gives the inverted version of pulses from the differentiator.
INTEGRATOR AND ENVELOPE DETECTOR
 According to inverted pulse of differentiator ,it get modulated signal would be reconstructed.
BAND PASS FILTER
 The band pass filter is use to filter out high frequency distortion and low frequency noise . And output from the band pass filter is an audio signal.
POWER AMPLIFIER
 It is use for the delivery of the audible messages through a speaker or headphone.
DIGITAL DATA TRASMITTER THROUGH LED
 A receiver, which resembles a portable traveler location system, has been implemented to obtain the demodulated signal.
30-01-2012, 09:39 AM
Post: #11
RE: Led Wireless
to get information about the topic Wireless LED full report, ppt and related topic refer the link bellow
http://www.seminarprojects.com/Thread-le...less--2297

http://www.seminarprojects.com/Thread-led-wireless
05-09-2012, 03:42 PM
Post: #12
Smile RE: Led Wireless
i am a student of electronic & communiation.I need to ppt of led wireles.Because my seminnear will starte frome next weack
25-02-2013, 03:10 PM
Post: #13
RE: Led Wireless
to get information about the topic led wireless full report ppt and related topic refer the link bellow

http://seminarprojects.net/t-led-wireless--2297

http://seminarprojects.net/t-led-wireless

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