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

Step 1: 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

Step 3: 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

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- fasten the jump ring and the French Ear wire to the aluminum support using the small pliers

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    20 Discussions


    5 years ago on Introduction

    Perfect Gift for a techie Wife!
    Very good instructable.


    6 years ago on Introduction

    nice project, i like that idea of using magnet as contacts and switch ;)


    6 years ago on Introduction

    Instead of the white led, get some rgb 2 pin color changing ones. Rest would be same.
    You can get them cheap on Ebay.

    1 reply

    6 years ago on Introduction

    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.


    6 years ago on Introduction

    How i would love to have a 3d printer im full of ideas but low on funding

    die potato

    6 years ago

    At first I thought it said lead earrings, ouch!

    Sam DeRose

    6 years ago on Introduction

    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.


    6 years ago

    This looks REALLY HARD! Is it?