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very simple project--probably

Discussion in 'Electronic Design' started by Paul Winters, Jul 10, 2007.

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  1. Paul Winters

    Paul Winters Guest

    I am trying to figure out the easiest way to have a bunch of LEDs
    alternate glowing continuously. I want to open a box and the lights
    to go on intermittently. Would I use a 555 timer or something else.
    And if so, how?

    thanks, Paul
  2. Paul Winters

    Paul Winters Guest

    And the sequencing should seem fairly random.
  3. Guest

    Hmmm, go to the dollar store and pick up a few 1$ fiber optic trees
    with RGB LEDs in them. These things cycle across all kinds of colors
    too. When you get bored of them, lots of parts are already laid out
    for you to tinker with.
  4. Use a PIC, of course.

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  5. Eeyore

    Eeyore Guest

    WTF does that mean ?

  6. D from BC

    D from BC Guest

    uC preferred but if that scares you then..

    MLS (maximum length sequence) generator.
    This uses a shift register + logic gates.
    Use RC networks to get the glow effect.
    D from BC
  7. Robbo

    Robbo Guest

    Make up 3 or 4 strings consisting of LEDs (say 4 leds), a current limiting
    resistor and a "flashing" LED (the ones with the integrated flashing
    circuitry) in series. Put the 3 or 4 strings all in parallel. The flashing
    LEDs flash at a slightly different rate to each other giving a random
    flashing effect. "Mix" up the locations of the LEDs so they are not all in
    the same area / line etc. Works well for little christmas trees.

    See how this goes:

    | |
    | |
    | |
    | |
    | ^ |
    pos flasher gnd/neg

    It worked for me, ymmv.
  8. neon


    Oct 21, 2006
    7475 Chip Use It As A Counter And It Will Cycle Continiously At Whatever Clock Rate Is Set. Use Lm555 And A Pot And You Can Set The Scanning Frquency. Done That For A Cross With Superbright Leds [[ Inpressive]].
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