All posts by Lenore Edman

About Lenore Edman

Co-founder of Evil Mad Scientist Laboratories.

Art Controller for Aquaponics

Control box

Logan wrote in to let us know how he is using our Art Controllers for his aquaponics project:

The system has two 140 gallon fish tanks and three 4×8 grow beds filled with grow stones. The beds water flow control is metered with Arduinos with data from Adafruit flow sensors on each bed. The important part is the bed water control, that is controlled by Art Controllers. We have almost 100 fat Talipia fish to fertilize the plants. The room is red because of all the high power LED grow lights.

grow beds under red light

The grow beds fill until a float switch trips the Art Controller that then opens a big 24 V solenoid valve draining the grow beds to a sump that pumps the cleaned water back to the fish tanks. The controller lets me program how long the beds stay drained so the plant roots get some O2 and not rot.

Thanks for sharing your project and pictures, Logan!

Highlights of Maker Faire New York

Mayoral Proclamation of Maker Week

Maker Faire has grown to an overwhelming event, where it just isn’t possible to experience everything, but we’ve pulled together a few highlights of the 2012 “World” Maker Faire in New York.

Maker Faire started out on Friday night with a Mayoral Proclamation declaring Maker Week in New York.  Mayor Bloomberg’s words— about his own tinkering background —were surprisingly personal and resounded with many of us.

Jeri Ellsworth

Shortly after the reading of the proclamation, Jeri Ellsworth was crowned Maker Hero at the Makey Awards while decked out in LEDs from eyelashes to skirt hem. Congratulations, Jeri!

Once Maker Faire got into full swing, we only were able to catch a few heats of Nerdy Derby, but it was a huge hit.

 We also enjoyed the wooden automata by Dug North.

We had the pleasure of speaking with Alden Hart about TinyG and grblShield, two motor controller boards designed for low-cost CNC machines.

DIWire is an open source CNC wire bender from Pensa.

Another CNC project we were excited to see in person was Pancake Bot, a pancake batter dispenser made from Lego.

MFNY3

While the sheer number of 3D printers was somewhat overwhelming, a couple of newcomers stood out from the crowd: the B9Creator and the Form 1, both resin-based printers.

Felt touch sensor arms

The Touched installation by artist Rebecca Strauss would quickly retract when touched, and then gradually relax again.

arms without their felt cover

It was made with conductive felt sensors mounted over wooden armatures.

Flipbookit

The flipbookit mechanical animation kit is on kickstarter right now. It looks much better in person than on the internet.

OLED boards

These tiny OLED oscilloscopes by Gabotronics made us go “squee”!

lasercut textures

Our good friend Jenine Bressner created rich textures from laser cut fabric.

MFNY2

And forming a bridge with the makers of the past, there was a beautiful collection of patent models from The Rothschild Petersen Patent Model Museum.

Photo of Jeri Ellsworth by Becky Stern.

Field Trip: Bell Labs Technology Showcase

Bell Labs

Bell Labs in Murray Hill, New Jersey is one of the sites that should be on every geek pilgrimage itinerary.

Bell Labs 004

Their Technology Showcase is a enshrined in a small exhibit area off of the main lobby. In the center of the exhibit, on a pedestal of its very own, is the first transistor. It looks like a very small piece of mixed media abstract sculpture, with geometric forms and wires bent in wonderful angles. If that were the only thing to see, it would still be worth the visit.

Bell Labs 003

Nearby, the first MOSFET sits in an impressive array of other firsts, including an early CCD and a micro-mirror array.

Telstar at Bell Labs

Telstar, the world’s first active communications satellite hangs overhead. This one is a flight backup unit that was never used.

Glass for fiberoptics

These fiberoptic preforms were placed under a polarizer so that the optical qualities of the cores would be more apparent to visitors.

There are many more beautiful objects, as well as interactive wall for exploring many world-changing developments that happened at and through Bell Labs.

Huge thanks go to Drew Fustini of Pumping Station: One for organizing our post-Maker Faire pilgrimage via twitter and driving us all up to New Jersey.

Open Hardware Summit 2012 Badges

ohs lego badge 015

The 2012 Open Hardware Summit is happening today in New York City and we had the pleasure of designing and building the badges for this year’s conference.

As you can see, the badges are built out of Lego bricks, and are a bit on the whimsical side. The hardware community’s connections to Lego run deep, as so many of us developed our mechanical understanding with it, and many of us continue to use it both for prototyping and play. (This is really only part of the badge; there is also a paper underlay below the Lego, with the attendee name and affiliation.)

We used LEGO Digital Designer, free software for Mac and Windows, to create the preliminary designs for the badges.  As we started shopping on bricklink (“the unofficial Lego marketplace”) to figure out exactly how many parts were actually available in the world in the particular shapes and colors that we needed, we gradually modified our designs to make them work with more commonly available parts.

ohs lego badge 012

We ended up running with four slightly different designs: one with plates, one with tiles, one with bricks, and one “dot matrix” with single round tiles.

ohs lego badge 014

Here is the most important part: The “modified 2×3 plate with hole” on the top, where your lanyard clips, has to be held very securely.  To be able to work with different sizes of backing plates available, we used a couple of slight variations on this theme.

Backs waiting to be finished

We ordered nearly fifteen thousand Lego bricks, sourced from twelve different suppliers, to make sure we could get all of the parts we needed.

Badges in progress

ohs lego badge 017

When all the parts finally arrived, our shop staff was happy to drop everything else they were doing to spend several days building Lego badges in time for the summit.

ohs lego badge 020

And for a final touch, we added a tool in a holder to each badge.  There are a few different tool types— our own little easter egg.

As we did with last year’s badges, we are releasing the design files (such as they are) in the preferred format for modification (lxf files). The four representative models are available for download here (37 KB zip file).

Open Hardware Summit and Maker Faire New York

Open Hardware Summit Logo

We’re very excited to be heading to New York for the sold-out Open Hardware Summit next week. There is another fantastic lineup of speakers this year, and it will be good to have the opportunity to catch up with the community after an eventful year for open source hardware.

See me at Maker Faire!After that, we’ll be going to Maker Faire New York, where you can find us demoing our kits in the Maker Shed.

We’ll be on the Make Demo Stage with the Egg-Bot on Saturday at 2:30 and Sunday at 3:00.

We hope to see you there!

Shuttle Endeavour Bay Area Fly-By

STS-126 Endeavour atop carrier aircraft

The Space Shuttle Endeavour will be passing through the Bay Area on Friday morning, September 21, and the NASA Ames Research Center has invited the public to come watch.

The shuttle is on its way to its new home at the California Science Center in Los Angeles, where it will be on display starting in October. It is passing over Mountain View on the way as a tribute to the work that was done there on the shuttle systems, including wind tunnel testing and thermal protection systems design and testing. NASA staff will be manning booths to share information about their contributions to the space shuttle program.

Event details are available on the NASA Ames website. All of the available parking passes have already been given out, so taking public transportation is encouraged. Hearing protection is recommended, as the 747 will be flying at 1,500 feet above the viewing area. We’ll hope to see you (and the space shuttle) there!

From the mailbag: flickering LEDs in series

We recently got a question about our flickering LEDs:

I’m wondering if it’s possible to wire these in series?

It’s a good (and not entirely uncommon) question, and the short answer is: “Yes, but not with each other.”

These LEDs have a little chip inside that turns them on and off in a flickering pattern. You can see it in the photo of the flat-topped white LED above. On the upper pad is the yellowish phosphor over the LED die. On the lower pad is the chip that turns the LED on and off.

If you put two of these in series, the first one turns the next one on and off repeatedly, interrupting the second chip and preventing it from executing its flickering pattern. The result is that you get momentary blinking, but not the nice flickering pattern.  (So yes, both would in fact light up; they just don’t behave how you might hope that they would.)

So how can you hook up a bunch of flickering LEDs together? If you want each LED to flicker separately, you can hook them up in parallel. But there is a way to use these in series with other LEDs. We can even use this to combine multiple LED colors to create some fantastic LED “flames” that would be great for stage props or putting inside pumpkins.
Continue reading From the mailbag: flickering LEDs in series

Vector engraved stipples

Laser-etched Hoan Bridge

Over at rasterweb, Pete has been playing with StippleGen2 to create artwork with the laser engraver at the Milwaukee Makerspace.

Laser-etched Hoan Bridge

StippleGen’s output consists of lots of tiny overlapping circles and this piece was made by using vector engraving, where the laser traces out each circle individually. In some places, the lasered marks overlap many times, leading to a new and unusual surface texture. In the closeup above you can see the ridges and valleys formed by the overlapped engraved areas. Go check out his article for the rest of the story about the project!

Makerspace Launch

The Makerspace program is a joint effort by O’Reilly’s Make division and Otherlab to put dedicated space and tools for hands-on making into high schools. They describe their aims on their about page:

By creating makerspaces in an educational context, students can have access to tools and equipment that they might not have otherwise; they can collaborate on projects that are driven by their own interests, and by doing so, develop the capacity and confidence to innovate. We see making as a gateway to deeper engagement in science and engineering but also art and design.

On Monday, September 10, we’ll be attending the Makerspace launch event at the College of San Mateo. We’ll be demoing a few kits and are excited to have the opportunity to meet educators interested in bringing making into the classroom. If you’ll be attending, please stop by our table and say hi!

Klein Bottle Openers

Klein Bottle Opener by Bathsheba Grossman

This is one of the coolest things that you can actually buy. It is a Klein Bottle Opener by Bathsheba Grossman.  It is made in the shape of a Klein Bottle, a 3D representation of a single sided shape.  And it opens bottles. It’s a 3D printed stainless steel sculpture that fits nicely in the hand, giving you just the right kind of leverage; an absolute pleasure to use.

Klein Bottle Opener

But— and this is where we were caught off guard— there’s a second great, yet completely independent, kind of Klein bottle opener out there: the Beverage Tool by Klein Tools. Klein tools is quite truly (as they say), “the #1 choice among professional tradesmen.”

We happened upon this gem at Hand-Eye Supply, the Core77 store, while visiting Portland, Oregon.  As far as we can tell, it was there because they like well-made tools, including those from Klein, not because they like mathematics.

Klein Bottle Opener

The tool has convenient “Tip-Ident” mark in the shape of a bottle cap so you can quickly find it among other tools.

And now, dear reader, you know where to get a complete set of Klein bottle openers.