RGB LED earrings for festivals, parties, raves, etc. Each earring weighs about 2g, or 3g including the battery (which is comparable to other earrings).

WARNING: these earrings come without a battery. See "What's in the box" below where you can buy them.

Patterns

These earrings can be run with various patterns! Using a button on the back you can cycle through the different patterns:

1. Rotating colors, cycling through all rainbow colors with the two sides having opposite colors.
2. Red and blue ("fire and ice") rotating in a similar fashion.
3. 3 rotating pink/purple LEDs with some fade out.
4. Rainbow colors "falling" from the top to the bottom along the sides.
5. Fire-like animation (in red).
6. Fire-like animation but now with green fire.
7. Fire-like animation but now with blue fire.
8. Pride flag 🏳️‍🌈 colors.
9. Trans flag 🏳️‍⚧️ colors.
10. Shut down / low power mode. The earrings can last a while in this mode (up to a few months) but if you're going to store them, it's best to remove the batteries.

How to use

Insert the battery with the flat side (with markings) to the outside. The rounded side goes to the inside, pressed to the PCB. Inserting them the wrong way around might destroy the earring and/or drain the battery, so check the polarity. The earring should light up immediately after inserting the battery.

You can select the mode using the button on the back. For a list of modes, see above.

Afterwards, it's best to remove the battery and store it in a safe way, in a way that avoids short circuits. You can use the included wooden stick to remove them by pushing from the top.

The batteries will typically last for over 24 hours, depending on the mode, and the type and quality of the battery. So you can use them for multiple nights at a festival. The blue color will fade first when the batteries run out.

What's in the box

• A pair of earrings (or just a single one of you've chosen that option).
• A protective case, to store the earrings.
• Some documentation on paper.
• Two small plastic bags to store the batteries safely.
• A small wooden stick to easily push out the batteries for storage.

Unfortunately, batteries are not included since shipping these batteries comes with various restrictions. Luckily, they're easy to find online on your local Amazon/eBay/Bol/etc under the name CR1220 (usually in a pack of 5 for a few euros). There's another type (CR1225) with a slightly larger capacity that is slightly thicker and should also fit, but after you've used those, the CR1220 batteries may not fit very well anymore and may fall out.

How they are built

These earrings use an ATtiny1616 microcontroller to control 18 RGB LEDs. These LEDs are controlled directly by the microcontroller (using a simple 9x6 matrix).

These earrings are assembled by JLCPCB. Since it's all open source, you can do this yourself if you want.

Open Source

These earrings are open source! The design files and the code is on GitHub, see the documentation link below.

The firmware on the earrings is written in the Go programming language (yes, really) using TinyGo. Controlling the LEDs is done directly in assembly due to the tight timings, but the animation is all done in Go. See the documentation link below for the source code. So if you feel like it, you can even program your own LED animations! Of course, they come pre-programmed so you don't need to do anything special.

I got inspiration from the really cool earrings made by California STEAM, also here on Lectronz. Check them out!

It may take a few days for me to send the package.

Currently, all packages are sent via normal mail and and will fit in a standard letterbox. You don't need to be home to receive the package. If you want other options (or no shipping option is available), please message me.

Import fees outside the EU are the buyer's responsibility. Check your customs for more information.