Picture of Led Earring
Do you like nightlife? This instructable tells you all you need to assemble LED earrings, including the instructions to make a transparent battery holder. The battery holder has an ON/OFF switch so you can turn the earring off to save on battery life.
This instructable requires medium capacity skills. Soldering is not needed.  Battery life :  approximately 20 hours

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Step 1: What you'll need - Materials

Picture of What you'll need - Materials
  1   Battery, non rechargeable, 3 volt,   lithium CR 2032                   

  1   Neodymium raw magnet,  diameter 6 mm, height 2 mm NdFeB, N45
        you can find it here www.supermagnete.it/eng/
  2   Neodymium raw magnet,  diameter 3 mm, height 3 mm NdFeB, N45 
        you can find it here www.supermagnete.it/eng/
  1   Screw M2x6 , inox    
        you can find it here www.ebay.com
  1   French Ear wire
        you can find it here www.ebay.com
  1   Jump ring light diameter 5mm  
        you can find it here www.ebay.com
  1   Small piece of plexiglas sheet , thickness 5 mm

10   cm of coloured ribbon like shoe lace
  1   small piece of Aluminum bar 30 x 30 mm  
        you can find it here www.item24.com/
  1   High Bright LED 3mm    7150 mcd   3.2V    20mA typ.   item# 751-1502-ND  
        you can find it here /www.digikey.com/

or you can buy all components in a kit here http://www.plugandwear.com/default.asp?mod=product&cat_id=96&product_id=253

or you can buy the earrings ready to wear here  http://www.blomming.com/mm/aisidream/items/led-earring

Step 2: What you'll need - Tools

Picture of What you'll need - Tools

Step 3: Battery holder - Sketch

Picture of Battery holder - Sketch
- print the drawing of the battery holder with a 1:1 ratio

- attach the drawing to the plexiglas sheet using a small piece of double sided adhesive tape

- mark the plexiglas sheet  in correspondence of  the five X  using a pin and a hammer

Step 4: Battery holder - cutting

Picture of Battery holder - cutting
- drill the holes of diameter 1.2 , 3 and 5.7 mm as described in the drawing

- make a countersink of diameter 18 mm depth 4mm inserting the pilot in the center hole

- make a countersink of diameter 20 mm depth 2mm inserting the pilot in the center hole

- cut  the battery holder using a  29mm hole saw inserting the bit in the center hole. IMPORTANT: be sure that the internal diameter of the hole saw is at least 25mm

Step 5: Battery holder - finishing

Picture of Battery holder - finishing
- remove the burrs of plexiglas using a diamond wheel or a small file

- drill the through hole of  diameter 1,6 mm

- thread it with the M2 threader

- drill a hole of diameter 1 mm perpendicular to the threaded M2 hole as shown in the last two pictures

- make sure that this last hole remains at the bottom of the 18 mm countersink plane

Step 6: Aluminum support manufacturing

Picture of Aluminum support manufacturing
- saw a 2.5 - 3 mm thick piece of 30x30 mm aluminum bar with a central hole

- make a 10.5 mm diameter countersink,  depth 2 mm

- remove the burrs of aluminum using a small file

Step 7: Magnets assembling

Picture of Magnets assembling
- insert the battery in the battery holder

- insert the 3mm diameter magnets from the rear of the battery holder until the touch the battery

- slightly lift the battery and the magnets 

- drip one drop of cyanoacrylate glue in each magnet hole, then press the battery back in its place

- assembly the M2 screw

- make a hole of  1mm diameter near the main hole  See the picture

Step 8: Led assembling

Picture of Led assembling
- Bend the led terminals as shown in the picture

- Insert the led in the main hole putting the + led terminal (99% of the times it is the longer terminal) throught the 1mm hole and then insert the - terminal in the central hole

- Insert the - led terminal in the 1mm diameter hole using small pliers.  Be careful as the led terminals break easily

- fasten the screw

- The - led terminal must be totally straight or it will cause a short circuit with the positive pole of the battery
  The + led terminal should be slightly bend in order to touch the + pole of the battery

- Put the 6mm diameter magnet over the battery and move it to touch the head of the screw.  The led will light up!! 

Step 9: Aluminum support assembling

Picture of Aluminum support assembling
- apply some epoxy resin on the aluminum support near the countersink and between the led and battery holder to glue all these parts together

Step 10: Ribbon assembling

Picture of Ribbon assembling
- assembly a ribbon sorrounding the battery holder in one hole of the aluminum support, using epoxy resin to fix it

- remove the extra remains of epoxy resin using a diamond wheel or a small file

Step 11: Finishing

Picture of Finishing
- fasten the jump ring and the French Ear wire to the aluminum support using the small pliers
bhvm1 year ago
Perfect Gift for a techie Wife!
Very good instructable.
Congrats on being a finalist!
rinkishimo2 years ago
nice project, i like that idea of using magnet as contacts and switch ;)
jtechian2 years ago
Instead of the white led, get some rgb 2 pin color changing ones. Rest would be same.
You can get them cheap on Ebay.
Lorenzo M (author)  jtechian2 years ago
I will test them asap Thanks !!!
lbateman12 years ago
Hi Lorenzo.
You may may need a current limiting resistor in your circuit depending on the forward voltage of your LED. eg. Some LEDs have a forward voltage of 2v. You LED probabbly needs about 2mA for nice night glow, so you would use (3v-2v)/2mA= 500Ohms (470 Ohms would be close enough). Some blue and white LEDs have a much higher forward voltage and either not work, or not bneed the series current limiting resistor.
this is awesome!
Lorenzo M (author)  andrea biffi2 years ago
thanks !!
apeace22 years ago
I want to see the schematic diagram of this,please
Lorenzo M (author)  apeace22 years ago

the shematic diagram of the led earring is the following

schematic diagram.jpg
never seen anyone use 8020 for accessories before!
turbonegro2 years ago
How i would love to have a 3d printer im full of ideas but low on funding
Clean and elegant. Love it!
die potato2 years ago
At first I thought it said lead earrings, ouch!
Sam DeRose2 years ago
I can't stop giggling to myself, I love this so much! Cant wait to to try it, maybe with different color LEDs. I absolutely love the incorporation of the 80-20 aluminum bar slice.
momoluv2 years ago
This looks REALLY HARD! Is it?
rmarchesi2 years ago
Very good project!
Oh, those are fun, I'm glad you added in the ribbon, really makes it stand out :D