Stroboscopic patterns for Easter eggs

Jiri Zemanek from Prague sent in this fabulous video of eggs decorated using the EggBot, some with markers, and some with the Electro-Kistka.

Various patterns are generated in Matlab using mathematical equations similar to ones describing Spirograph (or harmonograph) and Phyllotaxis. The patterns are calculated in such a way that when rotated under a stroboscopic light of suitable frequency or when recorded by a camera, they start to animate. It is kind of zoetrope— early device for animation. … Eggs are rotated at a constant speed, special for each pattern, by a brushless motor. No computer graphics tricks are used in the video.

Additional information is available at their site.

Introducing the AxiDraw

AxiDraw drawing machine

We are very pleased to introduce our newest art robot: the AxiDraw.

The AxiDraw is a simple, modern, precise, and versatile pen plotter, capable of writing or drawing on almost any flat surface. It can write with your favorite fountain pens, permanent markers, and other writing implements to handle an endless variety of applications. Its unique design features a writing head that extends beyond the machine, making it possible to draw on objects bigger than the machine itself.

AxiDraw drawing machine

The AxiDraw is a fantastic machine for making art — along with all those other things that you might use a pen-wielding robot for: Making “hand written” invitations, signing forms, or making neater whiteboard art than one might otherwise be able to.

AxiDraw is available to order today, and begins shipping next week. See it in action and learn more on the product page.

555 Teardown

Ken Shirriff has posted a teardown of the beloved 555 timer IC. He sawed the top of a metal can packaged 555 to expose the die underneath.

On top of the silicon, a thin layer of metal connects different parts of the chip. … Under the metal, a thin, glassy silicon dioxide layer provides insulation between the metal and the silicon, except where contact holes in the silicon dioxide allow the metal to connect to the silicon. At the edge of the chip, thin wires connect the metal pads to the chip’s external pins.

He goes on to explain how it works and its cultural significance. He even mentions our discrete 555 and 555 footstool in the footnotes.

The Adafruit Dronies

I’m pleased to announce that I’m on the judging panel for the new Adafruit Drone Film Fest, the Adafruit Dronies 2016.

The Adafruit Dronies celebrates videos taken from drones. The contest is open to everyone in the United States to show and share their amazing drone videos. You’ll be judged on creative use of technology, storytelling, and cinematography.

Entries are limited to five minutes and winners receive trophies as well as gift certificates to the Adafruit store. The lineup of judges is amazing, and  we’re looking forward to seeing your entries!

Linkdump: February 2016

dictation machine

Evil Mad Scientist Valentines: 2016 Edition

2016 valentines

Today we are releasing our newest set of “Download and Print” cards for Valentine’s day. This is our fourth year, and fourth set of cards: The 2013 set had six equation-heavy cards, the 2014 set was a set of six symbol-heavy cards, and the 2015 set included love, hearts, and arrows.

This year’s set of six new cards features a note about warming Pluto’s cold heart, at least one embarrassingly bad pun, and the perfect card for your robotic expression of love.

Solve for x
“I was supposed to solve for x. So glad I found u instead.”

Pluto heart

And, from the distant reaches of our solar system:
“Just knowing you’re out there warms my heart.”


“ROSES ARE RED
VIOLETS ARE BLUE
THIS VALENTINE AUTOMATICALLY
GENERATED FOR YOU”

2016 valentines

You can download the full set here, which includes all 24 designs from all four years (a 1 MB PDF document).

As usual, print them out on (or otherwise affix to) card stock, personalize, and [some steps omitted] enjoy the resulting lifelong romance.