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newbie question - jeoperdy game circuit

Discussion in 'Electronic Basics' started by Ashton, Nov 3, 2003.

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  1. Ashton

    Ashton Guest


    I am working on some project that works like the Jeopardy Game. What happens
    is, there are three teams, with buttons infront of them, and on each team's
    desk is a light bulb.

    After asking the question, the first one to press the button gets the ligth
    go on, on their table, while the rest of the team's buttons are disables,
    hence their ligth bulbs dont go on even if they press their button(as ong as
    one light is on.. the rest are disabled).

    Anyone who can give me an idea of how to do this? I know how to work if it
    were only two teams, but what do i use (if realys, any specific one? ) that
    would help me resolve this issue?

    Thank you for the help in advance,

  2. Hal Murray

    Hal Murray Guest

    I am working on some project that works like the Jeopardy Game. What happens
    Two suggestions...

    If you can do it for two, then start with AxB, BxC, and AxC. Then feed
    the results of that to another layer of the same logic. That should
    give you a simple result.

    I'd do it with silicon rather than relays. I's use a PIC or AVR, and
    do it in software. First run each input signal through a pair of FFs
    to avoid metastability. (That's probably included in the PIC/AVR front
    end.) Then in software, spin until at least one bit comes on. If
    there is only one, your job is done. If two or three, then you have
    more work to do.

    One approach is to change the rules of the game. Say everybody gets
    an extra $100 in the case of a tie. (Or only the teams that tied.)

    Or you could run a counter in the background, and use the counter to
    decide ties. Say divide the counter by 2 or 3 and use the remainder
    to decide.
  3. GPG

    GPG Guest

    _/ __
    +V -o/ o----|------------| |
    | B--|& |o- A
    .-. C -|__|
    | |
    | |
    _/ __
    +V -o/ o---|-------------| |
    | A --|& |o-B
    .-. C -|__|
    | |
    | |

    _/ __
    +V -o/ o--|-------------| |
    | A --|& |o- C
    .-. B -|__|
    | |
    | |
    created by Andy´s ASCII-Circuit v1.24.140803 Beta
    Triple 3 input nand gate, eg 4023. Outputs can drive a load through a suitable
    interface. Connect points marked with letters as shown.
  4. There are also bus-based circuits out there that can run any arbitrary
    number of stations. Most are quite simple and one can find several examples
  5. Yep. Just pick one at "random". If the quantization period is short
    enough and your "random" choice is fair enough no one will notice.
  6. ashton

    ashton Guest

    How do i work with this situation...

    inA--------> | | -------->outA
    inB--------> | |--------->outB
    in-C-------> | |--------->outC

    The logic is to be:

    Whichever input point is first to send the signal (example, value 1),
    then the other inputs are discared, and the ouput goes to the point
    that did the first input.

    Example would be, if three players press the button, the first player
    who presses the button gets the light on his table switch on, while
    the other player's lights on their respective tables dont go on, even
    if they pressed the button (thats because they pressed it late)

    Anything i can use to accomplish this?

  7. Well, you could probably do this with discrete logic, but for a couple
    of bucks you could make it with a PIC micro. The cost of the wiring
    and the table lights and such are going to swamp the cost differential
    between the two, and development kits are pretty cheap ($36 for the
    PICkit 1).
  8. Bill Bowden

    Bill Bowden Guest

    You could try this "Who's First" indicator circuit. It uses 3 parallel
    SCRs with a common cathode resistor so only one SCR can be triggered
    to light one light. Fairly simple, no micros or logic chips needed.

  9. JeffM

    JeffM Guest

  10. GPG

    GPG Guest

    Andys is not made for a lot of wires. Draw it out. The first switch
    will inhibit others. Output is logic low, uses 1 very cheap IC. Speed?
    Have not checked all available chips (and the one suggested is not
    alone) but the res sponse time is sub microseconds
  11. Franc Zabkar

    Franc Zabkar Guest

    - Franc Zabkar
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