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Picture of LED Jewelry
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Create yourself a unique necklace or earrings that will glow in the dark!

Step 1: Gather All the Tools and Material

Picture of Gather All the Tools and Material

The key to success is proper material and tools. Here is what you gonna need.

Tools:

  • Narrow pliers - 2 kinds
  • Round-nose pliers
  • Side cutters
  • Soldering station with 900M-T-2C soldering tip
  • Tweezers
  • Double sided tape
  • Piece of paper

Material:

  • 1mm/0.8mm straight brass rod
  • SMD 1206 LEDs
  • coin cell battery (CR2016, CR2025, CR2032, ..)
  • tin solder
  • soldering paste
HildaD38 hours ago
¡¡¡Hola!!! Me encanta tu trabajo. Mis felicitaciones.
This project is so cool!
We've actually started teaching it as a workshop to kids. There are a couple of modifications that we've found that make the process easier:

1) Using brass armature mesh (#80) for the battery holder instead of a wire across the back. It can be really hard to get the wire tight enough to hold the battery, but loose enough and the right shape so as not to crack the solder off when putting the battery in. The flexible nature of the mesh makes the margin for error much wider.

2) Using a nail template for bending the wire. This works really well for regular polygons and stars. As shown in the pictures, you only need two nails to measure and bend each side of the shape against. The result is a pretty consistently symmetrical shape.
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Can You please share the tree and the pentagram templates. I just can't make them… I tried several times but I just can't. Please
jiripraus (author)  KarloHorcicka1 month ago
Contact on my email maker@jiripraus.cz and I will provide you the sketches.
Arx3 months ago
This is nice and simple, but some leds won't be very reliable without any current limiting. Also, paralleled LEDs without any individual current limiting tend to hog current. This is the reason why cheap led flashlights with many paralleled LEDs tend to be uneven in brightness, and burn out over time.

Unfortunately, there's probably not a really good way to properly limit the leds and keep the design as simple, so I guess you have to decide on a reduced lifespan (total life of the led, not per cell), or a slightly more complicated design.

A single resistor in series with the coin holder set to limit the current to a safe value for a single led should reduce degradation over time, though it will also be less bright.

IamTeknik Arx3 months ago
From an electronics point of view, this is pretty poor but its an awesome art project. As you say, no current limiting and the battery will die after about 1-2 hours of use. I think the best option would be to add small SMD resistors in series with each LED. 1206 is small but 0603 would be better and you wouldnt reduce the aesthetics of the project at all. If you can also find LED's with a Vf of 3.2V, it would naturally draw the rated current (somewhat) of about 15-20mA. Ill give this a go with 0603 LED's and series resistors for each LED. You could also get decorative with where you place the resistors.
jiripraus (author)  IamTeknik2 months ago
That's true, it's no electrical beauty. But try it yourself. From theoretical point of view it is nonsense, it should not work. But experiments prove the difference. CR2032 battery can power circuit with 2 LEDs for 24h without any problem. No LED has been blown up either.
pjharro Arx2 months ago
I'm no expert but if I calculate the numbers right then it would need a 100ohm resister at 3v and 30mA. I wonder that the resistance of the brass wire would be? Is it true there can not be different resistance values at different points of a circuit? Or is it because they are in parallel this means it is not one circuit?

I am interested in the answer to this :)
indirshop Arx3 months ago
nice :)
Udon3 months ago
Seriously dig this.
How to prepare this one sir pls tell me
dejanf23 months ago
Amazing idea,very cool!
Yes! :)
Kiteman3 months ago
These are wonderful pieces - bravo!
KarloHorcicka3 months ago
This is amazing. I like hov you made that purple pentagram and tucked it behind out of focus. This idea is brilliant. I'll definetly make it
vrsolanki3 months ago
Very good simple and eligent design, just add smallest vibration sensor as switch to preserve battery and it will light only when needed !!
cool, I will try this! thanks for sharing
Cat00x3 months ago
I love this!!! Great way to combine electronics with jewelry. Very elegant design. Good luck in the contest.
prnet3 months ago
Very, very nice shaped. Amazing idea and realization.
DbiswasB4D3 months ago
excellent idea .
kaz.sommers3 months ago
How sweet is this idea, and so incredibly simple!
Brilliant idea that I'm sure many young people will just love to wear to concerts etc. :)
S0dyP0p3 months ago
The brass wire & SMD's takes the old LED throwie concept to a whole new level. This is classy and so nerdy all at the same time!
bambiix23 months ago
Damn this is nice !!!
Ham-made3 months ago
Also! Have you ever seen the work of Leonardo Ulian? I think you'd like his Technological Mandala series! He also has jewelry but it doesn't light up... http://www.leonardoulian.com/works/

jiripraus (author)  Ham-made3 months ago
This guy is incredible! But my "sculptures" have to work :)
Where can I get the led and the brass rod?
jiripraus (author)  ssbotrodriglez3 months ago
You can either buy a coil probably in any shop that sells beads and jewelry imitations. Or you can buy a straight rod in hobby model shops - they use it for the construction of planes. It depends on where are you from.
jkkucharik3 months ago
Beautiful work, very ingenious!
onetruegod3 months ago
This is elegant in its simple design. Nice!
Ham-made3 months ago
Hey Jiří!
Brilliant work incorporating the coin cell batteries into your designs! Have you ever considered making 3D shapes that connect together with magnets to form larger light structures? That way you could create a modular platform and let the consumer decide to build anything from a table lamp to a chandelier! You could even make templates available for light diffusion sheets that you could fold around and glue to the 3D shapes, that way you could choose what material to use from Mylar, to rice paper, to fabric, etc. as well as, have a choice of colour!
Cheers!
Mr. Ham
Vapowrite3 months ago
Oh wow, so cute and interesting. Nicely done :-)
crickleymal3 months ago
Nice designs although you're relying on the internal resistance of the coin cell to limit the current through the LEDs. Ideally you should have a resistor in series.
jiripraus (author)  crickleymal3 months ago
You are exactly right. It works without any trouble. CR2032 battery will lit 2 LEDs for 48h.
These look perfect!
watchmeflyy3 months ago
Clever idea for incorporating the battery. Nicely done!
KushagraK73 months ago
That's quite useful to practice some soldering skills.
gdai3 months ago
this is great. i wanna know, this brass rod is for welding? or it sells in craft stores?
Firewolf2483 months ago
Cool!
afcurlin3 months ago
thats pretty cool, I love the battery idea, no wiring :)
These look great! I love the clean and simple designs :)