Audio Reactive Kitty Ears

Screenshot from 2018-04-10 12-04-10

Mary Etta West at SparkFun has remixed Anouk Wipprecht’s Kitty Ear project to make it react to audio:

Audio Reactive Wearables

At the beginning of this year I began prototyping an audio reactive headband to wear in my everyday life, like while dancing with my dog in my lab listening to Legend of Zelda dubstep.

Screenshot from 2018-04-10 12-07-34.png

 A few weeks ago I saw this post by my favorite Engineer/Maker/FashionTech Designer/Roboticist Anouk Wipprecht – a kitty ears soldering project with 3D-printed headband. I immediately ordered the Electronic Kitty Ears Headband from Shapeways, and after more digging around I found the Instructables tutorial for the kitty ears soldering project. The tutorial includes the BOM, the .stl files for the headband and a link to the OSHPARK shared project.

I downloaded the gerbers and exported the dimension layer as a gerber by itself. Then I imported it to the dimension layer in EagleCAD so I knew I had the same dimensions and my circuit would fit in the Kitty Ears headband. You can see the prototypes in the first picture. In a day I captured the schematic from the original prototype circuit and laid out the PCB design in the Kitty Ears form factor.

The design files and source code are available on GitHub:


Audio Reactive Kitty Ears

Friday Hack Chat: How Do You Collaborate With Hardware?

Our guests for this week’s Hack Chat are Pete Dokter and Toni Klopfenstein of SparkFun Electronics. Pete is formerly the Director of Engineering at SparkFun and now the Brand Ambassador for SparkFun Electronics.

He hosts the According to Pete video series expounding on various engineering principles and seriously needs a silverburst Les Paul and a Sunn Model T. Toni is currently the product development manager at SparkFun. She’s served on the Open Source Hardware Association Board and participates in the Open Hardware Summit yearly. In her free time, she spends fifty weeks out of the year finding dust in her art and electronics projects.

via Friday Hack Chat: How Do You Collaborate With Hardware? — Hackaday

Friday Hack Chat: How Do You Collaborate With Hardware?

Rotary Encoder Breakout with Pull-up Resistors


This breakout board designed in KiCad makes it easy to put a rotary encoder and pull-up resistors on a breadboard.  (Thanks to Enrico for the idea to add pull-up resistors).  The footprints on the back are meant for 1206 SMD resistors.  I choose 1K Ohm resistors, marked 102, when I assembled this board.

Additional photos are available in the GitHub repo’s images directory and in a Google Photos gallery.

Here is the OSH Park shared project for the board:

Rotary Encoder Breakout with Pull-ups

Screenshot from 2017-04-04 15-55-27

Order from OSH Park

The KiCad design files are available on GitHub:



I used this KiCad symbol and footprint by Mike Cousins for a Sparkfun rotary encoder:



I’ve verified that these rotary encoders fit:

I wrote this Arduino sketch to run on the Teensy 3.2.  The brightness of one LED is controlled by the rotary encoder knob.  The other LED is turns on when the rotary encoder knob is pressed down:



Here’s a video of the breakout board being used with a Bourns PEC12R-4220F-S0024 and Teensy 3.2:

Rotary Encoder Breakout with Pull-up Resistors

Rotary Encoder Breakout Board

UPDATE: Check out the new version with pull-up resistors


I designed this simple breakout board in KiCad to make it easier to put a rotary encoder on a breadboard.   The KiCad symbol and footprint for the SparkFun rotary encoder was created by mcous on GitHub.  I used an updated version with corrected pin numbering.


Here are the rotary encoders that I’ve verified to fit:


The design files are available on GitHub:

Screenshot at 2017-02-14 20-58-40.png pdp7/rotary-encoder-breakout

The board is shared on OSH Park:

SparkFun Rotary Encoder Breadboard Adapter


Order from OSH Park

Rotary Encoder Breakout Board