Tindie

Name: Spiral LED earrings (pair)
SKU: 15320
Price: 29.00 USD
Availability: InStock
Rating: 4.92 (3 reviews)

Spiral LED earrings (pair)

(3 Reviews)

White LED earrings using ATtiny84a micro-controller, battery included

Designed by California STEAM in United States of America

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White LED earrings using ATtiny84a micro-controller, battery included

What is it? Earrings with LED's to light up any occasion. The different patterns are controlled by an ATtiny84a and programmed with the Arduino IDE. These earrings are powered by a CR1225 coin cell...

What is it?

Earrings with LED's to light up any occasion. The different patterns are controlled by an ATtiny84a and programmed with the Arduino IDE. These earrings are powered by a CR1225 coin cell battery, and will last at least a day, and up to 2 weeks (depending on the pattern and the color (voltage forwarding) of the LED). A button on the back of the earring can be used to select different patterns, or to turn off the device.

Why did you make it?

Challenged myself to use the ATtiny84a in something special. The small foot print of the micro-controller allowed using this in an earring. I wanted a very simple design, and by using the coin cell battery, I was able to run the LED's without current resistors (current of the coin cell is low enough). Two capacitors are placed close to the VCC pin of the ATtiny84a to make sure the voltage stays consistent while the LED's are flashing. I also wanted to experiment with using different layers on the PCB. The 'silver' on the earring is accomplished by removing the soldermask in that area.

What makes it special?

The earrings are entirely assembled by hand. I use a stencil and reflow oven to install the components on the font, the back is done with a soldering iron. Programming is done with the Arduino IDE. To conserve energy, the ATtiny84a is in sleep mode, 99.9% of the time. It only wakes up to determine which LED should be turned on or off before entering sleep mode again.

Extreme close-up of the ATtiny84a microcontroller used to control the LED's (3x3mm foot print!)

Rates to United States of America

Shipping Rate	Ships From	First item	Additional items
United States Postal Service: First Class Package	US	$4.00	$0.00

Quantity	Price
1-4	$29.00
5-9	$24.00
10+	$20.00

Review Breakdown

Average Ratings

Product: (5.00)

Documentation: (5.00)

Shipping: (4.00)

Communication: (5.00)

Tom | April 20, 2020

Snazzy earrings!

These earrings are super nice, bright LEDs with a bunch of interesting animation patterns. The power button is a bit sensitive so they tend to turn on when being handled so I have to be very careful to make sure they are off when I put them away. As a result, one showed up with a dead battery. No big deal, I have plenty of batteries!

Nina | Jan. 1, 2020

Beautiful earrings! I love them.

Really fun and creative earrings. I love the style and design.

I wish they featured two things -- an ability to turn the brightness up/down, and an extra set of batteries included.

Otherwise, they're perfect.

Response from California STEAM | Jan. 1, 2020

Thank you for the feedback. Implementing the ability to change the brightness should not be difficult to implement, I just have to figure out how to add a brightness option to the push button without making it too complicated. Unfortunately there are shipping restrictions on shipping batteries separate, but there are great options on Amazon for replacement batteries. Just search for CR1225 :)

David | Dec. 3, 2019