Category Archives: Engineering

Maker Faire Bay Area 2007 was fantastic!

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Kill your television and make stuff!Maker Faire was a smashing success. The big message of the fair was summarized succinctly and stamped on the back of a card we were given: “Kill Your Television and Make Stuff!”

We had a great time in our little prototyping world off in the corner of the Expo hall by SRL. Near us Bathsheba Grossman had her beautiful sculptures, Fab@Home was printing with cheese and frosting, John Guy had his 3D CNC gantry next to his margarita machine, and Lee Krasnow had an entire workshop for his precision puzzle making. We were also by a couple of exhibitors (as opposed to makers): Epilog and Protopulsion, but I have to say, it seemed like the makers all got a lot more traffic than the corporate folks with their tradeshow-style setups. We were all off behind the Tesla coils, which stole our visitors’ attention hourly. Nobody could compete with the Tesla coils when they were running!

We can’t possibly list all of the cool things we saw, and we didn’t see half of the stuff there, but read on for some of the highlights for us.
Continue reading Maker Faire Bay Area 2007 was fantastic! →

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Interactive LED coffee tables

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BWC's new coffee table

Last year at Maker Faire, we showed off our interactive LED dining table. There, we met the fine folks at Because We Can, who make amazing mostly wooden things with a little help from their robot. We eventually all decided on collaborating to design and build a new series of interactive coffee tables. We’ve just wrapped up the project and are introducing them this weekend at Maker Faire.

Besides what is written about them on this page, you can read more about them on the
Because We Can Blog, and you can also see lots of photos in the product pages for the two different coffee table designs: the wave and the ripple.

The new tables are designed to look really great whether or not you can see the LEDs. The wooden bases are elegant and attractive, and also if you go up to one and touch it, it will respond by pleasantly lighting up in that area. The tables are designed to respond in a subtle and gentle fashion to stimulus provided by human interaction. They are normally dim and constant– the most you’ll see in a dark room is a faint glow of twinkling like the night sky. When you set your glass down on the table, however, the table “sees” the motion that induces a slow ripple starting in that location that spreads out to other areas of the table as it dissipates. The overall effect is a bit like touching a pool of water, in that your local disturbance turns into an overall gentle rippling, and eventually settles down. It is decidedly not a disco floor– there is no blinking, no programmed oscillations, or for that matter, any digital electronics at all– the circuitry is completely analog to improve aesthetics and reduce eyestrain.

Continue reading Interactive LED coffee tables →

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A few more sugar sculptures

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Sugar Soliton

This is a rendering of the sculpture Soliton by Bathsheba Grossman, as output by the CandyFab 4000; it’s a three-dimensional form made out of pure sugar. Seeing Bathsheba’s sculptures at the 2006 Maker Faire was the inspiration for us to build the machine in the first place, so it’s quite exciting to be able to print this. (The design is used by her kind permission– please buy some of her sculptures!)

This is our second try at fabbing this difficult shape. Our first attempt was at a somewhat smaller size and ran into trouble with the thin beams when *one* of our thin horizontal layers turned out to be too weakly bonded. To avoid a second failure, we enlarged the model but also ran the heater element very hot and for an extended period of time to make the pixels srong, but also larger, more rounded, and richer in color– a darker caramel.

In this view we’re looking right down at the printed layers of sugar; we think that the grain of the layers makes this look a lot like a wood carving.

Of course, that’s not all that we’ve been printing this week. Here is one more large-scale object that we made:

mobius monster

The shape is a 3/4 twist mobius strip with a square cross section and windows cut at regular intervals in all of the sides the side. Even though it’s hollow, it still weighs seven pounds and fourteen ounces– that’s a lot of sugar. We’re bringing this monster to Maker Faire this weekend, so you can see it for yourself, too.

This entry was posted in Art, CNC, EMSL Projects, Play with your food and tagged , , , . Bookmark the Permalink.

Solid freeform fabrication: DIY, on the cheap, and made of pure sugar

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CandyFab Sign

In February we gave a sneak preview of our project to construct a home-built three dimensional fabricator. Our design goals were (1) a low cost design leveraging recycled components (2) large printable volume emphasized over high resolution, and (3) ability to use low-cost printing media including granulated sugar. We are extremely pleased to be able to report that it has been a success: Our three dimensional fabricator is now fully operational and we have used it to print several large, low-resolution, objects out of pure sugar.

Coil Screw, dodecahedron

Continue reading Solid freeform fabrication: DIY, on the cheap, and made of pure sugar →

This entry was posted in Art, CNC, Electronics, EMSL Projects, Engineering, Play with your food, Robotics and tagged , , . Bookmark the Permalink.

Reminder: Intro microcontroller class tomorrow (Saturday)

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Reminder: This Saturday, April 21, I’ll be giving a seminar at TechShop that’s an introduction to microcontrollers, called Choosing a Microcontroller. This is designed to be an introduction to the capabilities and variety of single-chip computers, as well how to actually pick one for a given application. It’s easy to get overwhelmed looking at the variety of range of micros, from four-bit micros that have a 4-bit wide data path — and actually cost four bits— to AVRs and PICs, basic stamps and Arduinos, to 32-bit gorillas with names like ARM, Blackfin, and Coldfire. So, we’ll try and cut through the fog and help you figure out where to get started.

If you’ve heard people getting excited about or doing cool things with microcontrollers and want to learn more, this might be a great introduction to the field.
Sign up for this and other TechShop classes here!

[Related: EvilMadScientist Microcontroller Projects]

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Resources for choosing a microcontroller

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ATtiny2313 I’ve put together a short list (after the jump) of some potentially useful resources that may be of help in choosing a microcontroller for your project, or just getting started with microcontrollers in general. I plan to add to this list from time to time. If you have other suggested resources to add to the list, please feel free to leave them in the comments here– good suggestions may be incorporated into future revisions of the list.

Continue reading Resources for choosing a microcontroller →

This entry was posted in Basics, EMSL Projects, Microcontrollers and tagged . Bookmark the Permalink.

Reminder: POV-Ray class this Saturday

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We posted earlier about (Evil, Mad) classes that we’re teaching at TechShop, the SF Bay Area’s public-access workshop. The first of these, Technical Graphics with POV-Ray is this Saturday afternoon, 3/31.

POV-Ray is free software that can make genuinely impressive 2D and 3D graphics and animations (examples), but the learning curve is such that it can be difficult to get started on your own. So, drop in and learn how to make it look easy!

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