Saturday, 10 January 2015

led - What solutions, if any, are there for visible light transmission (VLC)?


I want to know what ways are there to transmit data using LED's that are available to us today.


I currently can find only one reasonable resource for this topic, which is this: http://www.siemens.com/innovation/en/news_events/ct_pressreleases/e_research_news/2010/e_22_resnews_1002_1.htm


Is there any other information about this or resources I can use? What is the highest frequency can you blink a under $5 led at? What about a photo diode or photo transistor that can respond at such frequencies for under $5?


My aims are to have anything above 10KB/s but under $5 or so, with range that includes line of sight and it would be no more than one or two feet away. Am I just going at this entirely wrong and should instead use a RF solution? I am gearing towards visible light because it seems cheaper, does not give me the headaches of RF, and most certainly looks far more interesting than a RF or IR design, since you can actually see the process. :P



Answer



A project from the Czech Repuplic called RONJA gets 10 Mbps through more than a kilometer of open air with ordinary red LEDs. It uses a specialized amplifier design to drive the LED, but if all you want is to modulate an LED at a few 10s of kHz, then just wiring it to an output pin of a microcontroller will work.


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