random timer to control banks of LEDS

Discussion in 'The Projects Forum' started by nottechnical, Jun 12, 2011.

  1. nottechnical

    Thread Starter New Member

    Aug 6, 2010
    9
    0
    Not an expert in electronics but can construct circuits.

    I need a circuit that when a push switch is activated, 16 banks of five LEDs will illuminate in sequence for a period of approximately 10/15 seconds and then stop at a randomly selected bank on each occasion. Active push switch to restart sequence. If possible battery operated but not essential.

    Appreciate any advice.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    True random is a lot harder than you realize. One common trick is to have a push button and a very fast oscillator, so fast that you can't follow the LEDs. Where it stops becomes unpredictable, which may still not be random, but close.
     
  3. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
  4. nottechnical

    Thread Starter New Member

    Aug 6, 2010
    9
    0
    KJ6EAD
    Thanks for the info. Although both circuit would suit my needs I think the 37 LED roulette version would be easier for me to adapt.
    Many thanks for your interest and advice
     
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