Starting a 4017 from an output other than 0

Discussion in 'The Projects Forum' started by Otaku, Mar 24, 2010.

  1. Otaku

    Thread Starter Active Member

    Nov 19, 2008
    128
    2
    Hi all,
    I'm working on a LED sequencer and am wondering if a 4017 can be "told" to start on an output other than "0". I want to sequence 3 LEDs from outputs 0-2, using O3 as the master reset. No problem there, but I also want to be able to sequence 3 LEDs from outputs 4-6, using O7 as the MR. There would have to be two separate triggering conditions, I think. If this can't be done, I can just use two 4017s for this project. Thanks for all advice.

    Gary
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Nope. Go fish!

    You might consider using a universal shift register that has the parallel inputs pre-set. Have the 4th and 8th parallel outputs trigger the parallel load input.

    [eta]
    Since you can't wire two outputs together, you could use a pair of 1N4148/1N914 diodes and a pull-down resistor to create an OR gate.
     
    Last edited: Mar 24, 2010
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,733
    759
    LMAOF :D
    Good one.
     
  4. Otaku

    Thread Starter Active Member

    Nov 19, 2008
    128
    2
    Yep, that's what I was afraid of - thanks!
     
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