Led Sequence

Discussion in 'The Projects Forum' started by Rabster, Mar 5, 2011.

  1. Rabster

    Thread Starter New Member

    Mar 14, 2010
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    HI all

    IM about to start work on a new project, what im trying to do is to get a cirle of LED's to power up in sequence starting at 1 going all the way through to say 15 when it his the 15th one they flash off then on again and stay on till the power is removed.

    Any Ideas how i can do this im thinking a Decade counter maybe with a timer chip...
     
  2. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,771
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    google up 'ring counter circuit'
     
  3. Kerim

    Member

    Mar 3, 2011
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    What about 555 and CD4017 with 10 outputs (1 of ten counter) as a start? Using the CLR pin of 4017 shorter ring could be made.
     
  4. John P

    AAC Fanatic!

    Oct 14, 2008
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    Two 74HC595's in sequence, with an oscillator and counter.
     
  5. Wendy

    Moderator

    Mar 24, 2008
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  6. SgtWookie

    Expert

    Jul 17, 2007
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    Well, if the goal is to light them one by one and keep them on until they're all lit, I think I'd go with something like a couple of 74HC595 shift registers daisy-chained together, using the same clock. You'd then have 16 outputs. When the 16th output changes states, have it trigger another circuit that causes them all to flash for a number of cycles.

    You might use a 4017, but only one LED would be lit at a time. It's possible to use OR gates to cause the current & all previous outputs to show as high, but that's a lot of extra wiring and parts.
     
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