Introduction: LightBuddy: a Superbright LED Necklace

LightBuddy is a handy D.I.Y. LED necklace. It's a highly functional jewelry-gizmo that serves as a bright source of light. It's completely rechargeable and can be charged through any USB port.

Intended Purpose:

The project is ideal for illuminating dark areas for short periods of time. The 3W LED inside the necklace has a tendency to heat up. The design isn't intended to run more 15 minutes, going beyond could damage the LED. A heatsink can be added but it will take too much space.

Quick Description:

- USB Rechargeable (w/ Battery Indicator)

- Glows as bright as your AC LED bulb!

- Light weight (weighs 40-60g)

- Insturctable robot FTW! :D

Here's A Video Demo:

Last Minute Jewelry Contest Entry:

Please give this inscrutable a fighting chance! If you like it, don't forget to vote for my project in the jewelry contest! :D

Step 1: Parts & Materials

These are just alternatives. Parts are available at local stores (ex. RadioShack, Ace).


Parts & Materials:

- Two Instructable Patches (or similar)

- USB Lithium Battery Charger Module

- 3.7v 1000mAh Li-ion Battery (BL-5C)

- 3W Bright-White LED

- Tact/ Toggle Switch

- Wire


Tools & Equiptment:

- X-Acto (Hobby Knife Set)

- Leatherman Multitool

- 30W Soldering Iron

- Hot Glue Gun

Step 2: Slicing Holes

Cutting the patch with a hobby knife is the cleanest way of cutting holes for the LED and tact switch.

Step 3: Melt the Thread

Use a lighter to melt the thread around the holes, this prevents the cloth from tearing-apart.

Step 4: Battery Hack! Make the LED Run 3x Brighter

If you have enough experience with lithium batteries, I say give the hack a try. If you barely use lithium batteries, it's better to leave the battery's current limiter in tact, this way it is much safer. I have a separate Instructable for the tutorial.

Read More:Make A Cheap Lithium Battery Pack

Step 5: Add Wires on Every Component

Solder the necessary wires on each component. It's make the assembly, on step #9, much easier.

Step 6: Hot Glue the LED

Mount the 3W LED by applying a thick blob of hot glue.

WARNING: Never run the LED for more than 10 minutes, the hot glue coumelt due to the heat dissipation.

Step 7: Choose a Switch

There are tons of switches out there. I recycled mine from an broken transistor radio then hot glued it on the upper left portion of my instructable patch. I prefer the tact switch since I won't be using LED for long periods.


Pressing the tact switch should close the circuit, making the LED glow.

Step 8: Hot Glue the Remaining Parts

The charging module, battery and switch barely makes heat. A drop of hot glue should keep them intact for a lifetime.

Step 9: Wire Them All Up

Heat-up your soldering iron and follow this simple diagram! :D

Step 10: The Necklace

I have no use for my dog tag necklace. It has been lying around for years, so re-purposed it by recycling the metal-bead necklace for my LightBuddy project.

Step 11: Sewing - Borrow Mom's Sewing Kit

Most tech-geeks don't have a sewing kit but I bet everyone's mom has one! :D


Luckily, my teacher taught us how to sew clothing when I was in elementary. From what I learned and experienced, back-stitch is the strongest hand-stitched pattern. If you really have no idea on sewing, ask your mom or someone you know for help.

Here's A Video From Youtube (not mine)

Step 12: Give It a Try!

The LED should light up when the button is pressed.


I hope you enjoy the project and don't forget to vote!

- Thank You! :D

Jewelry Contest

Participated in the
Jewelry Contest

Instructables Robot Contest

Participated in the
Instructables Robot Contest

Green Electronics Challenge

Participated in the
Green Electronics Challenge

Battery Powered Contest

Participated in the
Battery Powered Contest