Working on Li-Fi (or VLC), need some help here.

Discussion in 'The Projects Forum' started by Shamonto Hasan Easha, Feb 23, 2014.

  1. Shamonto Hasan Easha

    Thread Starter New Member

    Feb 23, 2014
    11
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    Hi,
    I am Easha, new member here, and I'd like some suggestions, most of which is help.

    Ok, I am working on a science project of Li-Fi or VLC. I guess, you know what this is, right? I have completed almost everything except the device itself.

    So, I want a circuit diagram (or block diagram) of the circuit. If you know about this technology, you should probably know that it transmit data at about 700 Mbps. I want a circuit of it, transmitter and receiver individually, using LEDs (or three, Red, Green, and Blue) to transmit data from a laptop, smartphone or a tablet to the receiver connected to another device (laptop, smartphone or a tablet). This would transmit videos, audios and texts. Oh, this device should be connected via 3.5 mm jack or USB.

    If anyone out there can design such a circuit (keeping cost minimum), I'd kindly request him/her to help me out. If anyone wants to give any suggestions, you're most welcome.

    Waiting for your reply,
    Easha
     
  2. Greyinks

    New Member

    Mar 25, 2015
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    Hey Easha,

    I'm new in the VLC field & i'm working on similair project, & i'm stuck ... i have no idea what i'm doing, so guess i need your help any avaible schematics + codes

    Thanks, & i'm waiting for your reply.
     
  3. Papabravo

    Expert

    Feb 24, 2006
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    I haven't a clue what you guys are talking about.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    me neither :confused: lets talk English...
     
  5. bertus

    Administrator

    Apr 5, 2008
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  6. Greyinks

    New Member

    Mar 25, 2015
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    Project based on Li-Fi (visual light communication) consist sending diffrent kind of data from your Laptop to your phone or tablette or another laptop through light
     
  7. Papabravo

    Expert

    Feb 24, 2006
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    A quick Google check reveals that Li-Fi is an abbreviation for a subset of optical wireless communications. VLC is an open source video playback application. I should explain that we are mostly electronic hobbyists. We are not industrial or academic researchers. The kind of systems you are requesting require specialized knowledge and equipment that we just do not possess. A good place to start is with IR (infrared) protocols. They use LEDs just like OWC (Optical Wireless Communications), and a variety of modulation techniques just like OWC. I suggest that you will need to do a great deal more research than you have done to date in order to play in this sandbox.

    I also know that amateur radio operators who work in the 10 GHz. to 405 GHz range use rifle scopes to aim their dishes at the receivers 4 miles or so away on the next mountain top. Get yourself a Cabela's Club card before you go shopping.
     
  8. Greyinks

    New Member

    Mar 25, 2015
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    Well, i've done some researches & i've seen that some were able to get to the result, & IR isn't VLC ...
     
  9. Greyinks

    New Member

    Mar 25, 2015
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    That shows one of VLC projects that had been acheived so far!
     
  10. Papabravo

    Expert

    Feb 24, 2006
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    I never said IR was the same as VLC since I still don't know what VLC means in your context. The top Google hits indicate that it is an open source videao playback application. That is as far as I went. You can ignore my suggestion that you study IR protocols if you like, that is your prerogative. You still have not defined the requirements of your project so I'm not sure we can help you without more details of what you are trying to accomplish. You said you have no idea what you are doing so my advice was predicated on the words out of your own keyboard -- so to speak.

    Let me try again:
    1. You're going to need an optical transmitter. An LED would be a good place to start.
    2. You're going to need a way to modulate the LED. Pulse Position modulation would be a place to start.
    3. You're going to need a receiver. A photo diode, or photo transistor would be places to start.
    4. You need a way to demodulate the signal. A micro controller is indicated here.
    Once you've accomplished those tasks you can work on improving the range or the datarate or any other parameter. It might be your preference that we just hand you a finished product without the necessity for you to do any work at all. If I had such a thing I'd be glad to do that, but I don't. Maybe somebody else does and is willing to share. If not you're just going to have to do it yourself.
     
    Last edited: Mar 25, 2015
  11. Greyinks

    New Member

    Mar 25, 2015
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    Well, i need to interface the Arduino IDE with some kind of java interface so i can browse those files & data from my laptop to send them with arduino, using light
     
  12. Papabravo

    Expert

    Feb 24, 2006
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    I can't help you with an interface between the Arduino IDE and Java. Not my bag.
     
  13. Greyinks

    New Member

    Mar 25, 2015
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    & still, thank you so much i really appreciate it.
     
  14. Shamonto Hasan Easha

    Thread Starter New Member

    Feb 23, 2014
    11
    2
    @bertus, you are right, it is impossible on my part to acheive even 10 Mbps on it, let alone a Gbps. As I said, I knew very little about it that time.

    @Greyinks, I've tried a simple breadboard project of sending sound only by VLC (Visible Light Communication, and not Video LAN software). It worked, and was around 100 kbps or so. You gotta use quite expensive components for a Mbps on it.

    To make a VLC based tranceiver for PC, phone or even transmitting data from scratch, you need to learn electronics very well first. I stepped on it without "any" knowledge of it and was really at sea. Arduino and such are the best ways to start making VLC practically.
     
  15. Shamonto Hasan Easha

    Thread Starter New Member

    Feb 23, 2014
    11
    2
    Electronicsclub.info and build-circuits.com are one of the few places to learn and try electronics. Don't try wikipedia too soon, it'll make your sense moarr muddy :p
     
  16. Greyinks

    New Member

    Mar 25, 2015
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    @Shamonto Hasan Easha , thank you so much ... you've mentioned that you already sent sound. Would you mind show me the circuit diagram & the code please?! I'd be gratefull.
    Well, i'm doing my best to learn but, as you said it's a sea ... & i'm lost & i'm way behind my schedule ... Would you help me!
     
  17. Shamonto Hasan Easha

    Thread Starter New Member

    Feb 23, 2014
    11
    2
    It's an analogue circuit, made digital, without a microcontroller, so no code needed. I think I have the diagram in my PC. I'll send them when I get back to home.
     
  18. Greyinks

    New Member

    Mar 25, 2015
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  19. Shamonto Hasan Easha

    Thread Starter New Member

    Feb 23, 2014
    11
    2
    @Greyinks here is the picture of the diagram. It uses laser instead of LED, but the concept is same. You can replace it with an LED if you want.
     
    Greyinks likes this.
  20. Greyinks

    New Member

    Mar 25, 2015
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