Introduction: Raccoon Skull USB LEDs

howdy! so, I made a raccoon skull non-useful led usb light thing that plugs into the computer and is shiny and colorful. Taking the wiring technicalities from eXtremeSomething's hardwired usb led cube link here https://www.instructables.com/id/STEP-X-STEP-LED-CUBE-NO-Programming/ , I made a string of led's and shoved 'em all up in the cranial cavity of a raccoon skull. So, it gives mom a headache cuz it flashes a bunch but it's pretty cool looking. The bone softens the lights so they're not so blaring. 

If I find something dead soon that I have time for, I may in the future post an instructible on how to macerate (warm water maceration AKA letting the bugs clean up) a skull and how to wire it.  The raccoon skull was one I had cleaned up last winter and it's been kicking around so now it's colorful and wonderful.

Alright so hope this is clear-ish and if you have questions let me know!

Comments

author
eXtremeSomething (author)2011-09-01

OK WTF? You actually had done it, cool

author

Yes it is a present for a friend's birthday. I'm afraid that the resistor isn't doing its job and that I have hooked it up wrong. is there a backwards and forward on the resistor? the skull heats up some and I'm wondering if that's from the resistor not working, or if its from the closeness of the skull cavity and the heat from the leds gets trapped.

author
PedroDaGr8 (author)cabbagehats2011-09-04

Assuming your voltages are right, you can put the resistor either before or after the LEDs it doesn't matter. As for the heat, it's likely the heat from the resistor. There is a reason that a 2W resistor was spec'd. 2W is a good amount of heat for a tiny contained space.

That being said, do you know the ratings for you LEDs (forward voltage and current). If so, then we can check and see if that resistor is the right value.

author
cabbagehats (author)PedroDaGr82011-09-05

Also, the resistor is a metal film type rather than a carbon film. I didn't think it mattered so I got the metal film.

author
cabbagehats (author)PedroDaGr82011-09-05

forward voltage is 3.5, and forward current is 20. There are twelve LEDs in the cavity if that's useful.

I drilled some small holes at the top of the skull near the base where they'll blend in and not look bad and the heat has gone down. It's still there but more like forehead warm.

There is a coyote outside of town that I am looking at and perhaps it's skull cavity will be more spacious and allow for heat to dissipate.

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