How can I make LED christmas lights randonly twinkle?

Discussion in 'The Projects Forum' started by tduluk, Sep 13, 2018.

  1. tduluk

    Thread Starter New Member

    Sep 13, 2018
    Good Day:

    I have several sets of LED Christmas Lights (on a 50 LED string). I would like to have the LEDs in them randomly twinkle so that at any given moment, some would be steady on and others would be off. By "twinkle," I mean to softly fade in and out, instead of abruptly blinking on and off. Any circuit construction ideas would be very much appreciated. Thank you.
  2. dl324

    AAC Fanatic!

    Mar 30, 2015
    Welcome to AAC!

    Can't offer any assistance ithout knowing what you have to work with. But my initial impression is that you won't be able to do it because you won't have the ability to control individual LEDs.
  3. Uilnaydar

    AAC Fanatic!

    Jan 30, 2008

    If you just want to buy the kit:
  4. Sensacell


    Jun 19, 2012
    Best way to do "random" is to make each light it's own little oscillator / blinker.

    The will drift randomly in and out of sync with each other and look rather pleasing.

    When you first turn it on, they will be in sync, but depending on how accurate they are, in time they will drift apart.
  5. wayneh


    Sep 9, 2010
    You're pretty much out of luck from the start unless those strings already support different functions for different parts of the string. For instance I have a string that has a controller that can do a lot of that stuff, but that only works because the string has multiple conductors. It's essentially several strings in one.

    And by the way, my wife hates ALL the patterns and just wants the lights full on or off all the time.
    Last edited: Sep 13, 2018
  6. jpanhalt


    Jan 18, 2008
  7. Colin55

    Active Member

    Aug 27, 2015
    Put a fast fading LED with flicker in series with a flashing LED in series with a white LED on 12v and you will see the white LED flicker and flash randomly.