Mood lamp without mcu

Discussion in 'General Electronics Chat' started by majkl7777777, Jan 26, 2011.

  1. majkl7777777

    Thread Starter New Member

    Sep 18, 2009
    Hi there,

    I want to make a "mood lamp". Is there a way how to do it without need of a MCU?

    There should be 16 red LEDs, 16 green LEDs, 16 blue LEDs.

    And if it is possible there should be a potenciometer which will control the speed of transition. Maybe via PWM.

    Anyone can help???
  2. tom66

    Senior Member

    May 9, 2009
    Get some automatic rainbow color LEDs which cycle color over a few seconds. Wire them in series. The LEDs need to be powered from about 15V for 5 LEDs.

    The varying voltage across each LED due to sudden transitions will create a quite nice mood light, causing the LEDs to reset mid-cycle and run at different speeds.

    However the speed cannot be easily changed.
  3. Audioguru

    New Member

    Dec 20, 2007
    Years ago I made many Mood Lamps with opamp triangle-wave generators. The 3 oscillators oscillate slowly at different frequencies so the RGB colours add "randomly" and produce millions of colours at all brightnesses. The LEDs have a wide-angle beam so their colours overlap on the ceiling.
  4. SgtWookie


    Jul 17, 2007