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Infared remote control - help needed

Discussion in 'Electronic Basics' started by [email protected], Sep 9, 2005.

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  1. Guest

    Hi,
    I am currently working on a school assignment, where I have to build a
    fully working remote control and describe the process of building it
    and the way it works over about 20 pages. The problem is that I am a
    complete beginner when it comes to electronics. All I know about my
    specific subject so far is:

    - what infrared light is
    - that you need an emitter and an infrared diode or photo transistor as
    a receiver
    - that you might need to modulate the signal and use some kind of
    coding to be able to have a remote that works at the same range as TV
    remotes do and have a number of buttons between which the receiver can
    tell the difference
    - basic electronics such as what resistors, capacitors and transistors
    are, and how they work, but I don't really know how exactly they
    interact with each other, especially in circuits that are more complex
    than 2 or 3 components

    The end-product musn't be too complex since 12th-graders should be able
    to understand it, so I can't work with huge schematics. On the other
    hand it'd be lame to use some kind of high-tech chips who already
    include all the necessary components and I just have to put some wires
    to it. After all, I'll have to fill 20 pages. I'd have to find a middle
    way.

    My problem is I don't have any idea what to begin with. Even if I was
    able to build a remote, I still wouldn't know how to desribe it that
    detailed.

    I thought maybe some of you could help me out in any way, I'd
    appreciate any guidance, whether it's just an advice, a link to a
    website that offers instructions on the subject, or whatever...

    M. Seifert
     
  2. Eric R Snow

    Eric R Snow Guest

    Try the Nuts & Volts web site. They have had many articles about
    remotes and how they work. You can buy for pretty cheap the IR
    xmitters and recievers. Also, try Google. Search for IR remote
    control.
    ERS
     
  3. Si Ballenger

    Si Ballenger Guest

    You may want to consider getting one of the IR kits from a site
    like below and working with it. Most will have schematics and an
    explination of how they work.

    http://store.qkits.com/textcategory.cfm/IR
    http://www.rentron.com/3-bit-infrared.htm
    http://www.rentron.com/remote_control/tinyir.pdf
    http://www.rainbowkits.com/kits/ir-2p.html
     
  4. Guest

    Yeah, well...the problem with getting one of those IR kits is that I
    unfortunately happen to reside in Germany and shipping would probably
    be a major financial disaster if possible at all. In Germany I've got
    even fewer choices when it comes to information or products about the
    subject. And I've been searching on Google for hours, without finding
    anything valuable...But I guess I'll just have to keep trying.

    But thanks anyways, guys.
     
  5. Jasen Betts

    Jasen Betts Guest

    maybe design a remote that produces bursts of IR with the modulation
    frequency of the bursts dependant on which key is pressed

    maybe use a 555 chip with different timing resistors connected to
    each remote key, like one of those monophonic "organ" kits only modulating
    IR instead of driving a speaker,

    At the other end some sort of frequencyt-to-voltage circuit to decode it
    commercial remotes are digital and while digital signale like morse code
    aren't beyond the understanding of 12th graders understanding a circuit to
    generate and to deocde it built from discrete logic would probably be.
    fill some of those 20 pages with theory like how LEDs and photodiodes
    work, the inverse square law, filters...
     
  6. Rob

    Rob Guest

    Do you still need help on this. If you do, I'll see what I can do. I
    will post anything I have when I have it at:
    http://notrocketscience.mysite.wanadoo-members.co.uk/

    Regards
    Robert
     
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