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Description: These color-changing LEDs take the work out of creating crazy, flashy, blinky... ness. Simply apply power and the LED will cycle through the RGB colorspace: no external controller necessary! These bright and festive LEDs make great decorations, LED "throwies", indicator lights, etc. Typical forward voltage is 2V.

These 3mm LEDs are of the "slow-changing" variety, meaning they cycle at a rate of one color every few seconds.


Comments 3 comments

  • Just received a pack of 10. I timed a single one and it takes about 37 seconds to cycle through each color. There is some variation on timing for each unit. The colors go red, green, blue, yellow, cyan, pink/purple, white, and then repeat. I’m powering the LED from a single ATtiny85 pin, with regulated 3.3 volts, so a 68 ohm resistor is used and this little guy is bright! I tried a 1.5k resistor and the blue and maybe green elements do not light up, as one might guess. A magic eraser works okay to diffuse the light a little, but I’ll probably grab some sandpaper and rough it up better to give a softer and more uniform appearance. Maybe obvious, but blinking and PWMing does not allow the integrated IC to cycle through colors, even if one uses AnalogWrite with a relatively high value like 240 (of 255). This is sort of neat though, because as it will still fade or blink red as a status indicator, the color changing becomes like a secret that only activates when you just leave the pin it’s attached to high, understatedly cool. The blue element in one started flickering and gave out relatively quickly, but I can’t confidently say it was defective based on some of the stress testing I initially put it through. I’m going to use these with a cutesy board using the aforementioned uC I’m making to give out to friends. Rainbows are cool. If anything you can hot glue a bunch of optical fibers to the top and make a soothing little tree thing. I feel like those things have a therapeutic element that appeals to anyone who tends to fall asleep with the TV on. I don’t do that but I still like them.

  • Anyone know where I can find an SMD version of this?

    • I asked an acquaintance at Philips on this - he replied saying he’s not an expert (they don’t really do autocycle RGB LEDs) but asked around and nobody knows of any retail SMDs. 10mm, 8mm, 5mm, 3mm in these packages, and 5mm, 3mm (lens size) in superflux/piranha packages are all they know of. Once you go further down for individual LEDs, you’re looking at either off-the-shelf RGB SMD LEDs being driven by a tiny microcontroller off the side, or individual R, G and B emitters wired straight to the board (and a blob of clear epoxy dabbed on top of them) driven by a tiny microcontroller itself directly wired to the board (with regular ol' epoxy/cement on top).

      So if you wanted to make something like that yourself, you’d have to pick up an SMD RGB LED and a tiny microcontroller (apparently people have done this sort of thing even with a 6-pin ATtiny10!) and wire those up.

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