Sunday, January 11, 2015

Simple Circuitry Projects: Make a Lightbulb Necklace!

Note: This is a more seasonally appropriate version of my  Holiday Bauble Project - both projects can be made from the same parts, and are put together in a similar way, and are great as a first project for individuals or groups interested in circuitry!

Here's what you'll need: 

1 Miniature Glass Ornament
Some silver ribbon (I used Easter Basket filling)
2 Pieces of Wire
1 Lithium Coin Battery


A hot glue gun
A pencil
Some tape (electrical tape works best)

How to make your ornament:
Carefully pull the silver top off the glass ornament, then pull the pin out.

Use a pencil to push the silver ribbon into the ornament.
Put a piece of tape on the inside of the silver ornament top so that it covers the two holes. Poke one of the leads of the LED through the tape and through the hole so that the bulb is UNDER the ornament top.

Use the hot glue gun to secure the LED to underside of the lid so that the bulb sticks out by about half an inch. 

Then glue the lid back to the top of the ornament so that the edge of the lid touches the top of the glass neck of the ornament, and wrap both in your choice of duct tape. 

Make sure to test it! If the LED doesn't light, it could mean that you need to wiggle the leads so they aren't touching the lid of the ornament. 

Loop one of the metal ends of the black wire around the shorter lead on the LED, and secure it with hot glue or tape.  Make sure the wire is directly touching the lead! Then, do the same with the red wire on the longer lead.

If you're interested in doing the experiments (which require 2 or more baubles), here are the instructions I'm giving out with the kit below:


Series circuits are created by wiring all the components of a circuit in a line. The electricity moves straight from one component to the next. They’re useful when you want a circuit to shut down completely if it’s damaged. 

Just connect the wires red to black for series, and make sure the red wire goes to the positive side of  the battery, and the black to the negative. 

What happens when you add more ornaments to the chain? Try touching a paperclip to both leads of an LED in the circuit. What happens? Why is this? 

Parallel Circuits are created when each component gets its energy directly from the same energy source. They’re useful when you want each component to work independently of each other, or if you don’t want damage to one component to affect the others. 

For a Parallel circuit, the black or red wires for each ornament connect with the black or red wire leads of the next LED. The last black wire in the chain goes to the negative side of the battery, the last red wire to the positive. 

What happens when you add more ornaments to this chain? Try touching a paperclip to both leads of an LED in the circuit. What happens? Why is this? 

Finally, to finalize the lightbulb, tape the other end of the red wire to the positive side of the battery, and the black wire to the negative. The LED should light up. If it doesn’t try swapping the wires or moving the LED’s leads. If they’re in contact with the metal of the ornament top, the LED won’t light.

Now you can use your lightbulb as an ornament, a necklace, or whatever strikes your mood! And don't be afraid to personalize it with further decoration.

And if you happen to make one, please, send me a picture at I'd love to see it!