Wireless RGB light bulb


Want to make the above yourself? [Sprite_tm] did a thorough job documenting the build step by step (complete with pics, schematics, graphs, and links to the parts used). In summary, [Sprite_tm] busted open an Ikea CFL bulb to reuse the housing. Inside, he installed a scavenged power supply, ATtiny44, RGB LED module, and a radio receiver. A remote control allows [Sprite_tm] to change the lighting of his room to nearly any color. The cost of the project is a little under $30. The price tag isn’t so steep when one considers the insanely long lifetime of LEDs.


  1. Bill Hates says:

    Looks familiar…


    Nine bucks more and you get a five watt LED..

  2. jomegat says:

    yes, yes, but this is HACKaday.

    excellent hack as always from sprite_tm

  3. hpux735 says:

    Nice work!

    Honestly, even with the wires and circuit board hanging out it’s more attractive than the thinkgeek bulb. ;)

  4. thedudefrommiamivice says:

    I did something similar after seeing the one on thinkgeek.

  5. just some nerd says:

    why is there no heatsink ? besides this its nice.

  6. andrew says:

    i have to agree, sprite_tm never fails to deliver good hacks.

  7. ino says:

    Ok, it’s a nice design but he could have done this less complicated with only one buck converter for the 3 leds and 1 transistor per led for pwm.
    Simpler, cheaper, better efficiency and way less noisier.

    Anyway, for a first, it’s quite good.

  8. Sprite_tm says:

    Ino: I tried that… but unfortunately all the components had such losses that I couldn’t reach the needed 1amp to light the leds fully at 1/3th duty cycle. That’s why I took this approach.

  9. Sprite_tm says:

    Oh, to add to my previous post: why the 1/3th duty cycle? Because the leds have a different forward voltage, which means I still would have to use series resistors if I wanted to turn them all on at the same time. By switching them on one at a time, I could use the buck-converter to adjust for the difference.

  10. ino says:

    Oh ok, I see. Buck converters aren’t easy to design when you’re looking for efficiency.

    You should check on Dx, there’s a converter delivering 650mA under 3.6V. It’s almost perfect for this kind of application and around 3 bucks.

  11. ctabm says:

    Just wondering- didnt he break open a cfl which contains a small amount of mercury?

  12. ino says:

    My guess is he removed the ” tube ” from the pcb. No need to break it.

  13. Sprite_tm says:

    Nope. The internals of the lamp still are intact; I could put 220V on it and have some light if I wanted.

  14. Bill Hates says:

    just giving you a hard time sprite…. I like the hack!

  15. Jack says:

    Bulbs…? Don’t they grow out of the ground….Oh you mean a lamp! lol

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