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12 blinking led project???

Discussion in 'Electronic Basics' started by [email protected], Jun 17, 2005.

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  1. Guest

    I am working on a model that calls for 12 randomly (or appears to be
    random) blonking LED's. I am a total newbie to this so I am looking
    for help in working up a list of items I will need and help with the
    circuit board I am guessing I will need to make these LED's blink. Any
    help would be much appreciated.
     
  2. Bob Monsen

    Bob Monsen Guest

    You can buy blinking LEDs. Depending on your application, they may be
    just right.

    There are also circuits that simulate random times using shift registers
    and such. They are much more complex.

    I'd just go with the self-blinking LEDs. In that case, you need a
    voltage supply, and a resistor for each one. Try 1k and a 9V battery.
     
  3. Bob Eldred

    Bob Eldred Guest

    If it were me, I'd develop a single chip solution using a cheap PIC
    microprocessor with only 12 LED's, 13 resistors and a capacitor as
    peripheral components, nothing more. I'd use a two port processor and drive
    the 12 LED's with 12 of the 16 available bit lines. I'd run an internal
    oscillator and generate a low speed clock. I'd use this to run a 256 bit,
    maybe longer, pseudo-random shift register in eight or more of the
    processors registers. I would tap the registers at various points and output
    those signals to the LED ports. As the processor runs, the LED's would blink
    on and off in a random way. It sounds complicated but is really quite simple
    and is all accomplished in software (code). If you want more information or
    help with code, etc. please e-mail me at nsmontassocatyahoodotcom. Remove
    the ns from the beginning and put the normal @ and . in their places.
    Bob
     
  4. I needed to do a similar thing and used some novelty christmas
    decoration electronic kits available in th UK from Maplins

    wrote in @o13g2000cwo.googlegroups.com:
     
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