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November 6, 2009

Online servo database with user reviews

A reader just sent me a link to servodatabase.com, which lists RC servo specifications and provides user reviews, a comparison engine, and various forms of sorting. Looks like a very good resource. [Thanks, Phil!]

Posted by Sean Michael Ragan | Nov 6, 2009 06:00 AM
Electronics, Online, Robotics | Permalink | Comments (1) | Suggest a Site

Weekend Project: Making Char Cloth

Learn how to make a cheap and effective fire starter made from an old t-shirt.
To download The Char Cloth video click here and subscribe in iTunes.
See Char Cloth in action with the Fire Piston from William Gurstelle.
For more info on what Swedish Fire Steel is, check out this article.

Cupcake CNC build part 1: Introduction & background

Having just arrived home from a quick trip to the hardware store, I was pleasantly surprised to see a large, unmarked, cardboard box sitting on my front steps. This isn't an uncommon event, since I am constantly checking out cool products and projects for the Maker Shed, however this box was a bit larger than normal.

Oh wow, it's the Cupcake CNC kit from MakerBot Industries! I'd ordered it weeks earlier and had completely forgotten about it. (The truth is out: I have an atrocious memory, sad but true.)

And so the adventure begins! I'm going to document my "out of box experience" with a MakerBot. How many posts will the series be? I'm not sure since I've never built one. How often will I post about the build? Again, not sure, but I'll try to do at least one a week, maybe more, it all depends on how much free time I have between all my other maker-ly projects.

A little background: My CNC experiences

I've been tinkering with CNC for about 10 years, and consider myself an enthusiast, not an expert. I do own a few CNC mills, routers, and lathes. I have retrofitted old mills, and even build one from scratch. Pictured above is my mobile CNC machine, dubbed the "MobileC." I stuffed all the components into a mobile tool cart so I could bring it to hackerspaces, workshops, and events, all in the hopes of helping out fellow makers.

Read full story

Two-person AT-AT costume

From Photobucket user 8jarjar8, this video of a Chinese-lion-dragon style AT-AT costume with lighted cheek-lasers. Don't really know anything about the makers/wearers. Anybody with info, please feel free to comment. [via Geekologie]

SUCCEED Blog: "A collection of the world's most epic, awesome, mind blowing Succeeds"

Tumblr Ksnmhbzdsw1Qa9I3Bo1 500
"FAIL" is a shortcut for thinking, not very encouraging and overused, "SUCCESS" is where it's at - many of the "success" posts found on this new site are projects from MAKE!

SUCCEED Blog: "A collection of the world's most epic, awesome, mind blowing Succeeds"

The intersection of arts and science: Between the Folds

For folks interested in the intersection of arts and science, the PBS series Independent Lens is presenting a fascinating in-depth look into origami titled Between the Folds. The film documents "a determined group of theoretical scientists and fine artists who have abandoned their careers and scoffed at their graduate degrees to forge new lives as modern-day paper folders."

Featured in the film are MIT's youngest-ever tenured professor Dr. Erik Demaine; mathematician, sculptor, puzzle maker, and self-taught computer scientist Marty Demaine; master free-style folder Vincent Floderer; pioneering Israeli educator Miri Golan; mathematics professor Dr. Tom Hull; trained artist and instructor Paul Jackson; one of the most technically accomplished folders in the world, Eric Joisel; one of only a few handmade origami papermakers in the world, Michael LaFosse; origami "hyper-realist" and physicist Dr. Robert J. Lang (who was profiled in CRAFT Volume 05); material artist with a masterful understanding of patterns and geometry, Chris K. Palmer; and the father of modern origami, Akira Yoshizawa.

Screenings are part of the Independent Television Service's (ITVS) Community Cinema series, which are free, followed by discussion panels and access to resources.

Between the Folds will be showing in the Bay Area in Oakland on Tuesday, November 17 at 6:00 p.m. at the Oakland Asian Cultural Center and in San Francisco on Wednesday, November 18 at 5:45 p.m. at the San Francisco Main Library. For a list of screenings taking place across the country, check out the film site.

Here are a couple of interesting excerpts from the documentary to get a flavor for it. The following clip features Paul Jackson, an origami artists and art teacher living in Tel Aviv, Israel, speaking of the "one fold":

And this clip shows Michael LaFosse, a master artisan who not only makes origami, but is one of the only handmade origami paper makers in the world, providing a window into his workshop and processes:

"Letters, we get letters..."

Mark Frauenfelder and Dan Woods got sent this letter about the latest issue of MAKE, Volume 20. We got the sender's permission to post it here:

Mark and Dan,

This is Jim Kelly, the freelance tech writer in Atlanta. Hope you guys are doing well.

Just wanted to write and tell you how impressed and inspired I am with issue 20 of MAKE magazine. The interview (and foreword) with Adam Savage was extremely fun to read. As a father of a 2.5 year old, I too am anxious to encourage my son to explore, take apart, design, and enjoy the creative process.

Issue 20 was directed at kids, and I think you hit the bullseye, with force behind it. I hope this issue is one of your bestselling ones, and I for one am encouraging parents I know to pick up a copy. I'm also purchasing a few extra copies for some teachers I know.

My son just got done watching me configure my new CNC machine to mill out some fun designs on wood; his eyes could not have opened any wider. I wish all kids could have access to this level of technology and machinery, but unfortunately, our school systems seem to be cutting shop class and art projects and focusing time and money on standardized test-taking skills... how unfortunate.

To bring this all home, I guess what I'm trying to say is that there is such a demand for material/content that encourages our youth that a void has been created and cannot be filled fast enough. MAKE is in a unique spot to develop something that goes a little beyond the Maker Shed and the quarterly magazine. Maybe it's a subscription-based activity website, with monthly special projects broken down into categories such as "Do It Yourself" (no parents required), "Dad and Me" (or "Mom and Me" - projects with the parents), and more. Maybe it's a special magazine (like your Halloween special issue) that focuses on even more kid-friendly content. Or maybe a mixture of projects and inspirational interviews (Dean Kamen comes to mind) in a book format.

I'll wrap this up by saying that I, Jim Kelly, hate the three month wait between issues of MAKE... I read every issue over and over again. I'm starved for this type of content. And I'm an adult - imagine what those kids who have this creative streak inside them must feel? They're in need of something... not sure what... and maybe you guys can figure out what to offer them. Issue 20 could easily be just the tip of the iceberg.

Take care,

Jim Kelly

Thanks for your thoughts and kind words, Jim. Reaching the educational market, be it home-schooling parents or teachers in grade school and college, is an increasing focus of ours. We see the new Make: Science Room as part of that effort. We also have the Make: Education social network to reach out to educators and and to create a place where they can network with each other. We've also been working on a dynamic new project-based program of making and mentoring designed to raise the next generation of makers. We're developing this with some very innovative, high-profile partners and are very excited about the prospects. Stay tuned -- we'll be making an announcement about this in the next few months and looking for some kids to participate in a pilot program.

We'd also like to point out that there is something to tide maker parents, kids, and educators over between issues of the magazine: this website, Make: Online! Over the past year, we've been adding much more original content, regular columns, weekly projects, guest authors, and special programs. And then there are our regular Weekend Project podcasts, and special videos, like Collin Cunningham's MAKE Presents series, and Marc de Vinck's how-to and kit build videos. There's a lot going on here, so we hope you're getting your daily dose of MAKE from us. If there's anything else you'd like to see us do here to satisfy your MAKE fix, please let us know. We're always looking for ways to expand and improve the site.

From the pages of MAKE:

Want to know how to build a hydrogen rocket? How about a laser light show in a lunchbox? Or a simple remote-controlled videocam car? Or maybe you want to go old-school and build a wooden mini sailboat or toy car launcher? All this and tons more, plus revealing photos of Adam Savage's maker childhood, can all be found in MAKE, Volume 20, "For Kids of All Ages." Get your individual copy in the Maker Shed, or subscribe now.

Meeting makers in Detroit this Saturday

I'm in the Detroit area this week, exploring plans for a Maker Faire here next summer. I've been spending most of the time at the Henry Ford Museum in Dearborn, a treasure-trove of American making.

On Saturday, I'll be stopping by the new hacker/maker space called I3 Detroit in Royal Oaks, MI. I'll be there from around 11 am to 1pm (give or take a half-hour). If you are a maker in the area, and don't mind giving up some time that you might otherwise spend on your favorite project, please drop by I3 Detroit and share your thoughts on doing a Maker Faire in the Detroit area. I am always looking to discover new makers and learn more about cool projects -- at home, in schools, or even at work. I am also proud to talk about our new "kids of all ages" issue.

I3 Detroit is located at 322 East Fourth Street, Royal Oaks, MI.

Linking mugs

I can't seem to find a way to describe these "link mugs" without venturing into uncomfortable sexual metaphors, so I'll just let the photos speak for themselves. So you can, you know, carry a bunch of them at once. [via Slippery Brick]

Halloween on Berkeley's Russell Street

Our very own Michelle Hlubinka, MAKE's Educational Director, is quoted in this Daily Californian piece about the celebtrational insanity of Russell Street, in Berkeley, known for it's elaborate decorations and large, costumed crowds.

Below is one of the yard decorations Michelle's family put together. Their theme was "Attack of the Killer Tomatoes." I love the Dixie cups for monster teeth.

Halloween Revelers Flock to Russell Street

Marble skull looks like foam

Fabio Viale makes incredible marble sculptures that appear to be made of foam. No description of the build process is included, however I assume that it includes a healthy dose of elbow grease. [via kottke]

Art Heist build complete

My friend Tod Kurt and I finished building our laser tripwire art heist! (He did all the heavy lifting.) This is for the Machine Project Benefit this Saturday night. Here's a sneak peek:

We're using a hazer to make the laser beams visible, which works surprisingly well in this semi-open space. To increase the spectacle we installed a few extra lasers that are not being sensed for tripwires, but just look cool. The heisters won't know which these are, however, so it adds to the challenge without increasing complexity.

In this side view you can see what happens when you break too many beams: lots of lights come on, including a blinding, red LED array. For this Tod used an Arduino-controlled AC optical relay. I'm hoping Tod will write up the whole project for a MAKE article, because he has all kinds of neat tricks like this throughout.

The event is shaping up to be truly wonderful, and affords the attendee a rare chance to hang out in Mister Jalopy's secret underground lair. I'm totally shameless, so if you ask I'll eat some laser for you. There are still a few tickets available, hope to see you there!

"Large Hadron Collider scuttled by birdy baguette-bomber"

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The God machine just can't catch a break...

A bird dropping a piece of bread onto outdoor machinery has been blamed for a technical fault at the Large Hadron Collider (LHC) this week which saw significant overheating in sections of the mighty particle-punisher's subterranean 27-km supercooled magnetic doughnut.

According to scientists at the project, had the LHC been operational - it is scheduled to recommence beaming later this month - the snag would have caused it to fail safe and shut down automatically. This would put the mighty machine out of action for a few days while it was restarted, but there would be no repeat of the catastrophic damage suffered last September. On that occasion, an electrical connection in the circuit itself failed violently, causing a massive liquid-helium leak and knock-on damage along hundreds of metres of magnets.

Beautiful scrap wood butcher block table

I love this. Instructables user wholman has gathered together a bunch of scrap wood from "dumpsters, back alleys, vacant lots, abandoned buildings, recycling yards, and architectural salvage centers" and laminated it together using all-thread. Then he's very carefully smoothed and polished only one side of the finished block, leaving the underside rough to show off the process. Beautiful.

AIRduino guitar

Ever wished that when you play air guitar, it would make real sounds instead of just the ones from your best death metal face? David Fournier, Jean-Louis Giordano, Monireh Sanaei, Maziar Shelbaf and Gustav Sohtell are here to help. They build the AIRduino guitar, a wearable virtual instrument. Open source with full documentation, naturally. [via Fashioning Technology]

Ask MAKE: Image sensors: CCD vs CMOS

Ask MAKE is a weekly column where we answer reader questions, like yours. Write them in to mattm@makezine.comor drop us a line on Twitter. We can't wait to tackle your conundrums!

Ian writes in:

I was looking at buying a digital camera, and read that there are two kinds of sensors that they can use to take a picture- CMOS and CCD. Can you tell me what the difference is, and if one is better to get?

Sure! It's actually a pretty topical question, as the inventors of the CCD just won this year's Nobel Prize! As you mentioned, there are two basic kinds of image sensor that are used in today's digital cameras, CCD (charge-coupled device) and CMOS (complementary metal oxide semiconductor). They both work by converting light energy (photons) into electric charge (electrons), and the difference is in how this charge is read out.

To start, both kinds of sensor are made of a grid of 'buckets' placed evenly across a flat semiconductor surface. Each bucket acts as an individual sensor, which only sees a tiny portion of the image. By displaying a bunch of these tiny points in a grid (using a computer monitor or printer), we see the image.

Making color images is a bit more complicated. Because the buckets are sensitive to any wavelength of visible light, if we just looked at the results we would see a monochrome image. To get color information, we arrange the sensors into groups of four, and place tiny red, green, and blue color filters over them. Each group of four sensors is what we call a pixel, and it is interesting to note that modern cameras have millions of them.

Ok, so both CCD and CMOS sensors are basically just big arrays of individual sensors, so how are they different? The difference is in how the charges are collected and read out. In a CCD, the 'bucket' that collects charge is just a capacitor. To read the image data out of the CCD, the charge in each bucket is pumped individually over to an ADC (analog to digital converter), which actually measures charge. In a CMOS sensor, each bucket contains a photodiode and some amplifier circuitry. To read the image data out, the output of each amplifier is connected to an ADC through a multiplexer, which measures the voltage at each cell.

I don't think that either technology is necessarily better, but each has its own quirks. There is an interesting site at dvxuser which talks about the different kinds of sensor artifacts associated with each kind of sensor. For most cases, though, I think that other specifications, such as ease of use and sensitivity to light, are probably more important to think about when choosing a digital camera. Good luck!

[photo by SarahCartwright]

Nonexistent town in Google maps

Nonexistent town in google maps.jpg

Interesting article in the Telegraph about "Argleton," a town that appears in Google maps but does not, apparently, exist in the real world. The best theory I've heard is that the town is a "trap" intended to catch those who steal map data. [Thanks, Glen!]

How ice spikes happen

Anybody else might shrug off these ice spikes as a meaningless hiccup in the preparation of a frosty beverage, but not Lenore and Windell at Evil Mad Scientist Laboratories!

Snowcrystals.com has a fairly detailed explanation of how these things form, and it's documented elsewhere as well. (Roughly speaking, supercooled water is pushed up through a hole, somewhat like magma forming a volcano.) It's relatively easy to form these in your freezer if you start with distilled water, but occasionally-- as in our case --they do occur with regular tap water.

How-To: DIY Apple Remote shield for Arduino

Care to hand control of your playlist over you to an Arduino?

Awhile back I was working on a project that that I wanted to be able to start music the on my mac through the IR receiver. After a while of looking around I found this library which allows you to use your arduino as an Apple Remote. I integrated it in to my project and it worked great! So the other day I decided to make an Apple Remote shield for my arduino.

Check computergeek's instructable for the step-by-step.