Picture of PCB Hummingbird Necklace on the Othermill

Welcome to another OMC project tutorial! If you like making jewelry and have some experience using the Othermill, then this is a great project for you! This style of necklace offers a wonderful way to get creative and artistic with double-sided machining on the Othermill.

This necklace has four LEDs on the back of the pendent, which provide a beautiful glow around the outline of the pendant and highlights the pattern on the front of the necklace by illuminating the etched traces.

This Instructable has the files needed for three different designs: one has a blank front, one has a circle design on the front, and one has actual bird patterning on the front. Download these files in the next step!

Please feel free to use this technique to design your own pendents by mixing and matching your favorite shapes with your favorite colored LEDs. If you do design your own unique necklace, please post pictures of your creation in the comments. All of us here at Other Machine Co. would love to see them!

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Step 1: Tools & Materials & Files

You'll need the following for this project:


  • An Othermill
  • Otherplan
  • 1/64" flat endmill
  • 1/32" flat endmill
  • Double-sided tape
  • Soldering Iron and Solder
  • Hotplate
  • Solder Paste
  • Jewlery Tweezers
  • Needle-nose Pliers


  • FR1 boards (single and/or double sided)
  • Surface mount LEDs and resistors
  • Jewelry making supplies
    • Jump rings
    • Clasps
    • Sterling or Steel wire for wrapping (you can use stripped hookup wire!)
    • Chain, Chord, and/or Beading thread
  • CR1025 3 Volt battery
  • A surface-mount battery holder for the CR1025


  • Single-sided hummingbird, no pattern on the front (hummingBirdNoFront.brd)
  • Circle pattern for the front (circles.brd)
  • Double-sided pendent with bird pattern on front (hummingBirdWithFront.brd)
  • Clasp (claspBoard.brd)
jessyratfink10 months ago

I think this might be my favorite project you've done so far, really beautiful! :D

NTT10 months ago
Really nice! Why not use the actual necklace as wires?

Wow, gorgeous!

Thanks, Danger!

nqtronix10 months ago

Stunning beautiful.

The one with the engraved feathers is my favorite I guess :)

Now the only thing left to do is adding a little microprocessor and a few RGB LEDs. And of corse a little capacitor to hold the energy while the energy is temporaly lost. And maybe a little microphone to trigger on external events. The LEDs could also serve a light and color sensor. Patterns and color changes could all be handeld by the microprocessor. Of course it would need to be an absolutly tiny package with a very low power consumption, such as an attiny44a... hmm... Low current LEDs could also cut the power consumption down. Further improvements could be done by dimming the LEDs when the full brightness is not needed, or switched completly off when they would be invisible in bright sunlight anyway. A smd version of the famous joule thief could be utilized to squezze out the last droplets of power. The copper on the front could turn into a capacitiv touch button for manual interface... hmm.. so many possibilities :D

Too bad I neither have the time to design something like that nor somebody who would appreciate all the work so I'll leave it to somebody else to mashup these ideas with their own project. ;)

This is awesome :). Thank you so much for sharing.

samalert10 months ago

Ohhh thats very awesome. Great design and a very usable outcome. While reading i thought it will be again the same pendant which will not be practical where battery comes in place. But the lazer printing made me read till last and its really worthy. The way the connections are made are godly. Nice one !

dackermans8410 months ago

Cool idea of combining LED with jewelry!

Honus10 months ago

That is really cool!

Victor8o510 months ago

Impressive and very beautiful! I wish I could work at that scale...

ChrysN10 months ago
It looks so lovely. I like that it looks good even without the lights on.
gabrieltaft10 months ago

This turned out so great... That othermill is looking pretty sweet.

dktousti10 months ago
First sorry for my english.Your instructable is wonderful. You arrived to married art, technologies, design and mode. Please tell me what muse call to you . Congratulation. Fred