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Designing wireless controllers

Discussion in 'Electronic Basics' started by Jeffrey Schwartz, Dec 11, 2005.

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  1. I am designing a game that requires three players to wirelessly signal a
    central unit whether their 'buzz in with the answer' button is pushed.
    I had great success modifying Radio Shack wireless doorbells because
    they have three different channels with three different carrier
    frequencies. Unfortunately, when two players 'buzz in' nearly
    simultaneously, the signals interfere with each other and I can't
    properly detect them. I also tried using commercial TV infrared
    controllers and receivers but, if two players buzz in nearly
    simultaneously, the signals again interfere and the receiver gets
    confused. I tried using a Holtek encoder-decoder scheme but, again, if
    two players buzz in nearly simultaneously, the signals interfere. Any
    suggestions?

    Jeff Schwartz
     
  2. Guest

    Use fourier transform to determine which phase is earlier.
     
  3. John Fields

    John Fields Guest

    ---
    Here's what I'd do:

    I'd have the handheld units be transmitter-receivers, each with a
    crystal oscillator and a counter which would start accumulating
    oscillator clocks as soon as the button was pushed. At the same
    time, a signal would be sent to the remote receiver (in the control
    unit) which would cause the remote transmitter to send a signal to
    all of the handhelds, at once, telling them to stop counting but to
    hold the count. It would then query each of the handhelds, one at a
    time, as to what number of clocks its counter had accumulated.
    After determining which one had accumulated the largest number of
    clocks (the winner) and lighting the lamp (or whatever) it would
    send a signal to all of the handhelds which would clear the counters
    and start another round.
     
  4. Ken Moffett

    Ken Moffett Guest

    Are there simple R/C model transmitter/receivers that can be set to
    channels, and have the outputs fed to "Jeapordy" logic circuits already
    available on several web sites. I have a 6 position unit that I would like
    to "cut the wires" and go RF. I just haven't looked yet.
     
  5. Jasen Betts

    Jasen Betts Guest

    yes typical RC transmitters are operate on separate channels unlike thise
    doorbels, door openers, and infrared remote controls, which just use coded
    pulses to diferentiate.

    Bye.
    Jasen
     
  6. Rich Grise

    Rich Grise Guest

    What about Radio Shack fob transmitters? Are they all pretty much at the
    same frequency? I wonder if it'd be worth it to poke around with retuning
    a set.

    Thanks,
    Rich
     
  7. Jasen Betts

    Jasen Betts Guest

    that'd probably require replacing the tuning component (SAW filtter or
    crystal)

    If only three transmitters are needed three of those cheap
    golf-ball sized radio-controlled toy cars would have the neccesary
    parts.

    Bye.
    Jasen
     
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