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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

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21-10-2009, 02:32 PM
Post: #3
RE: Led Wireless

.pdf  LED-wireless-LED.pdf (Size: 360.16 KB / Downloads: 894)
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

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13-07-2010, 11:06 PM
Post: #5
RE: Led Wireless
PLEASE SEND ME FULL REPORT

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