Make: Online: Education Archives

Archive: Education

November 20, 2009

Make: Projects - Pneumatic trough, part II

image from golden book of chemistry experiments page 28.jpg

Last week I wrote about how to construct a simple sheet metal "bridge," which, in combination with an ice cube bucket and an olive jar, makes an effective pneumatic trough for collecting gas samples over water. This week I'm going to show you how to use this apparatus to generate and collect pure oxygen, and how to use that oxygen to observe the brilliant blue flame of sulfur oxidation.

Tools:

Pneumatic trough apparatus from part I
Small piece of plate glass (I used the mirror from a makeup compact)
Lighter
Twisted wire sample loop
250 mL Erlenmeyer flask (I got mine from The Maker Shed)
#7 two-hole rubber stopper to fit Erlenmeyer (mine came from this assortment)
Two 80 mm lengths of 5 mm glass tubing to fit stopper (such as this)
Approximately 18" length of 5/16" OD x 3/16" ID PVC tubing to fit glass tubing (common hardware store item)

Materials:

Water to fill bucket
Elemental sulfur powder (also called "Flowers of Sulfur," available at some drugstores and here.)
3% hydrogen peroxide (common drugstore item)
Manganese dioxide (can be recovered from an alkaline dry-cell battery or purchased here)
Petroleum jelly (drugstore)

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November 14, 2009

STEM resources for teachers

This weekend I had an opportunity to attend a renewable energy workshop organized by the Southeastern Massachusetts Achievement and Retention in Technology group at Bristol Community College. The morning was packed with teachers sharing their lesson and unit ideas on ideas based around the STEM subjects of green technologies and energy.

The college offers a Lending Lab for tools and lab equipment that most schools are unlikely to stock. Through using these equipment resources, teachers can get their students' hands onto enough materials to for a series of lessons on windmill design, hydrogen cars, air purity testing, and more. Teachers shared their experiences in bringing this equipment into their classes and how it affected student learning.

The NEED Project was a new one to me, focusing on bringing the ideas of energy systems to the classroom. Their site has an extensive collection of materials organized by grade level that are ready to implement in the classroom, from background information to student handouts. Chuck Lawrence of Upper Cape Regional Technical High School shared his experiences of having his students evaluate the energy use of educational spaces in the school, and has encouraged his students to help their families understand their use of energy from environmental and financial perspectives.

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November 13, 2009

Transparent solderless breadboard

Recently I've been helping a friend's 11-year-old daughter get started in electronics. The use of a solderless breadboard was counterintuitive to her until I gave her one of these clear-cased versions, available through Solarbotics. As she puts it, "you can see where the metal is."

November 11, 2009

How education threatens creativity …

Ken Robinson speaks on the importance of creativity and how closely it depends on our freedom to make mistakes. Hmmm … to put it more accurately - Sir Ken Robinson explains how our modern education system represses creative thought by discouraging mistakes. If you've ever stared paralyzed at a blank canvas/page/protoboard/ etc, you likely understand the problem. In fact, when I find myself stuck in a loop of perfection paralysis, the best cure seems to be starting off in an intentionally wrong direction. Sometimes demonstrating how I don't want a project to go, can define how I do want things to turn out … or at least 'break the ice'. [via The Stretta Procedure]

November 8, 2009

Cigar box music player

Cigar boxes are great containers for loads of things. I had a bunch on hand after going to the local wine shops and asking for donated cigar boxes. Inspired by the Rock and Roll Speakers project in Fashioning Technology, it seemed like a good idea to have my students build their own music player embedded in a cigar box. This is a major project, taking several weeks, though it probably could be done by an individual in an afternoon without introducing many of the concepts we've worked on.

Box preparation
The boxes are pretty well made, and we found that we could sand them and coat them with spray paint. Boxes with colorful printed designs can be left unpainted. We have a vinyl cutter, so a lot of class time has gone into making custom multicolor stickers from photos. We're using the Threshold tool in Gimp to convert the image to a high contrast black and white, and then importing it to Open Office Draw to add a border. Having a border makes the sticker weeding process much easier.

Speaker insert
Using some scrap cardboard a metal ruler, utility knife, and careful measurement, we made an insert to hold the speakers and cover up the electronics. The speakers sound much better when enclosed. Just putting them inside the box improves their sound even without the cardboard insert. The speakers are secured to the cardboard with hot melt glue, and some students are making speaker grilles for further protection.

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October 29, 2009

Flammable ice

This awesome little chemical machine is from Mr. Kent's chemistry page. Ice is laid in a Pyrex dish over a layer of calcium carbide. As the ice melts, the liquid water reacts with the carbide to produce acetylene gas, which of course is highly flammable. A match starts it off, and then it burns continuously on its own. My first thought was that the system could rapidly spiral out of control--more heat melts more water makes more gas makes even more heat. But it's limited by the amount of oxygen that can get down into the pan, I think. My second thought was that maybe a bit of sodium metal down there with the carbide could make the process self-igniting.... (For God's sake, no one try that.)

October 25, 2009

MassTEC Conference

Last week, at the annual MassTEC conference, an interesting collection of technology engineering education, science, and math teachers gathered to share experiences and information. Here are some highlights:

Johanna Bunn, of the Boston Museum of Science, introduced the Engineering the Future curriculum, with interactive demonstrations of hands-on projects introducing students to structures, fluids, and electricity.

The forum on the Massachusetts state science and technology curriculum frameworks introduced a series of strand maps that show how the concepts and possible activities in the various STEM subjects interrelate. Their hope is that existing and new courses could be designed so that they step students through learning ideas within courses and how the courses could build upon each other. Right now, the maps are static PDFs, but their goal is to have them be more interactive in the way they connect projects and concepts.

Martha Cyr, Director of K-12 Outreach at the Worcester Polytechnic Institute, showed the TEACHEngineering site, which has resources for K-12 teachers. The site's search engine allows teachers to find curriculum and projects that map to many states' frameworks, and loads of scientific and engineering concepts. The curriculum tools on the site have a consistent look and feel and have been tested by STEM teachers.

Nate Ball of Design Squad told of his experiences in backyard, garage, and kitchen making. Though his school in Oregon lacked a hands-on technology and engineering program, his childhood was filled with adventures of the making sort. His rigorous personal projects and academic record led him to MIT, where he discovered what engineers do. When WGBH uncovered a need for youth to understand more about the realities and techniques of engineering, he was in a group of students who helped to develop possible projects for the show before he tested for and ultimately filled the role of host. The show encourages creativity, teamwork, and real world problem solving. The third season of Design Squad has just begun airing, and the site has lots of curriculum resources, and full episodes of the show.

If you are involved in an organization helping to prepare teachers and their students for a lifetime of making, pass along some links in the comments.

October 24, 2009

Inside-out horse for educational purposes

Gillian Higgins teaches horse owners about what's "under the hood." To do so, she very carefully paints detailed anatomical art onto the pelt of her white horses "Freddie Fox" and "Henry." [via Neatorama]

October 19, 2009

Bildr: componentized, crowdsourced DIY how-tos

What Bildr is attempting to do is very admirable. It makes good sense. It will be glorious, if it happens. Something similar has been talked about in tech DIY circles for years. The idea is to create a visual Web-based library of componentized instruction sets, "building blocks," for doing various hardware and software constructions. Put a bunch of these components together, and you have all of the instructions you need to execute a multi-part project. It's extraordinarily ambitious, but when you look at other crowdsourced creations, such as Instructables and Wikipedia, it just seems so doable. But to make it happen, it'll need LOTS of love, care, sweat-equity, money, and people power. Let's hope it happens, 'cause... how cool would such a resource be?

October 16, 2009

Litmus candy

Windell of Evil Mad Scientist Laboratories noticed that the "Blueberry Blast" candies he picked up contained red cabbage extract, which, as every evil mad scientist knows, is a classic homebrew pH indicator. So he dunked three samples in baking soda solution, neutral water, and vinegar. Sure enough, visible color changes.

October 11, 2009

Junkbot student videos

As a summation assignment for the CD scrounging, battery pack and junkbot projects, students made videos showing their junkbots. In the videos, which were made on whatever equipment they had available, they were to show the 'bot, explain what they did to make it, and explain a bit about how it works. Part of the project was a writing assignment where they wrote about their junkbot and what they learned from the project. Not all of the students put the videos online, instead, emailing them in. Having the videos online definitely creates a better, more lasting record.

Grayson writes in his video notes:

Three things I learned about components that I did not use on my junkbot are things about LEDs, stepper motors, and potentiometers. I learned that LEDs only allow electricity to flow in one direction. If you hook up an LED backwards, it will not light up. Another thing I learned is that you cannot control a stepper motor without a computer chip. They are controlled with many coils and one person cannot run one with a single battery pack and a motor. I also learned that potentiometers (variable resistors) control the amount of electricity flowing through a circuit. Potentiometers can control things such as volume, motor speed, light intensity, etc.

What are your classroom projects this year? Do you have videos or photos that you could share with us to show off the creative makers you're working with? Post up some links in the comments, and add some photos to the MAKE Flickr pool.

October 10, 2009

How-To: Time lapse movie from photos

Sometimes you want to tell a story that takes a while to unfold. One of the beauties of digital photography is that you are not limited by how many shots are on the roll of film, now you can shoot until your camera's card is full. With the high capacity cards available now, you can shoot a very large amount of high resolution photos and barely fill your card.

In this project, we'll use Windows Movie Maker, which comes bundled with the operating system on many computers. If you have a Mac or Ubuntu machine, keep looking. iMovie surely has a process similar to this, and I haven't found a good way to work with movies on Ubuntu. Add your thoughts in the comments if you know of good software for other other platforms. All the windows machines in my classroom run on XP, I have heard that Moviemaker is a bit harder to find in Vista.

Making movies and sharing them online is a great way for students to sum up what they have learned from doing a project. By using the video description, students have a place to park a written explanation of what the project helped them learn and what the photos depict. They can write the text in any word processor and then add it to the video description when it is uploaded. If they need to alter it later, they can just edit the notes by logging in and making the changes.

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October 8, 2009

New in the Maker Shed: 4-Bit Microcomputer Kit

The 4-Bit Microcomputer Kit from Gakken features a 20-key keypad, a 7-segment LED, and 7 individual LEDs. It comes pre-programmed with 7 different applications, and you can even program your own via the keypad. It's a fun retro kit, just begging to be hacked! Don't forget to check out Gakken magazine 4-bit computer rollout party in Tokyo.

October 7, 2009

Intern's Corner: My robot of mass destruction

MAKE: Intern's Corner
Every other week, MAKE's awesome interns tell about the projects they're building in the Make: Labs, the trouble they've gotten into, and what they'll make next.

By Eric Chu, engineering intern

Let's admit it. We've all had thoughts of building our own robot of mass destruction. Well, I was able to do just that for my college class Engineering 102: Robotics Design Challenge ... sort of.

Last spring my class used the Lego NXT robotics platform to solve two engineering challenges. The first was to build a robot that can cross a pit filled with ping-pong balls, racquetballs, and mini whiffle balls. The second was to build a robot that navigates through a maze, distinguishes between orange and blue balloons, and pops all the orange balloons. Both challenges had a time limit of 2 minutes.

Meet Poke-e, my team's balloon-popping, maze-navigating robot:

Poke-e is made completely out of Lego Mindstorms NXT parts, except for the straight pins that are attached with green duct tape (generously donated by my friend, Dan). I felt horrible putting the non-Lego parts on, but at least it looked pretty killer afterward!

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October 4, 2009

Christina and Forest at Maker Faire Rhode Island

At Maker Faire Rhode Island, I saw Christina waiting near the AS220 Fab Lab for her son Forest. She was holding some of the replacement parts that he had made for his MakerBot. We talked a bit about what making means to her and Forest. They're already looking forward to Maker Faire 2010.

MAKE subscribers, watch your mailboxes for Volume 20: Kids, which should be arriving very soon.

October 3, 2009

Chutney jar PCB etch

I had two circuit boards nagging me to be etched this morning. Without a photo developing tray, it seemed some modifications in technique were in order. Into the recycling bin I went, looking for a smallish, wide-mouthed glass jar. Yesterday's sandwich polished off a tasty mango chutney, and the jar was just about right. A little bit of cleaning, and it was ready for business.

The leftover etchant from yesterday's vinyl PCB resist adventure was in a plastic bottle and still had some potency. The tea water was hot on the stove, so it was ready to provide some double-boiler action. I poured some hot water into a steel pan, put the ferric chloride into the jar in the pan, and dropped in the first board.

With a jar, you can tighten the lid and do more vigorous agitation than in a tray. Between the shaking and the heat, the process is quite a bit faster than when using a room temp bath and a pan. I forgot to check the time, but it was definitely quicker than yesterday. After the first of today's boards was cleared, I dropped in the second at 10 minutes to 11. This one I agitated even more than the first one, and it was easily done by 11. When it was clear, I rinsed off the boards and headed to the soldering iron.

After wiping down the boards with acetone to remove the adhesive from the vinyl sticker, I tinned the traces to get them ready for the chip, which will be soldered onto the PCB SMD-style.

This technique would be a lot simpler and safer to use with students in your maker classroom than agitating in open trays. Since the chemicals are sealed away inside the jar, there will be much less of a chance of spillage or splashing. Check out the PCB etching article in MAKE, Volume 02 for more ideas and techniques.

Vinyl cut PCB resist

Recently, we are working in class on a variation of the Rock and Roll Speakers from Fashioning Technology. Rather than using perfboard for the circuit, we'll be burning our own circuit board. The chips are through-hole LM386's, but I don't think it is realistic to have the students drill 8 aligned holes on the circuit board at this point in the course. Jockeying for time on the drill press would create a logjam in the project. There is an excellent primer on printed circuit board etching in MAKE, Volume 02. After thinking this through a bit, I came up with an idea to turn the through-hole component into a smd component. The technique is a bit like the design of the Broadcast Your Podcast FM transmitter circuit, which just has you solder the components together in pools of solder on chips of board. However, in the BYP project, there is no custom board, the blank copper clad board is cut with a utility knife to create the various connecting points.

When the chips finally arrived from Electronic Goldmine, I looked up the datasheet for the LM386 to get the measurements. In Open Office Draw, I drew out a design that would match up with the pins. With the help of Pat, who is doing an independent study on CNC tools this year, I sent the file to the machine with the vinyl cutter. He cut the file, then we weeded it to see if it matched the chip. The file matched the pin locations of the chip, so we made a few more iterations to get the process down and the layout right. When we got it right, we cut three copies of the file for boardmaking.

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October 2, 2009

'Logicomix' - A Comic Book About Logic, Math and Madness

Holt-650
Book Review - 'Logicomix' - A Comic Book About Logic, Math and Madness - Review @ NYTimes.com...

Well, this is unexpected -- a comic book about the quest for logical certainty in mathematics. The story spans the decades from the late 19th century to World War II, a period when the nature of mathematical truth was being furiously debated. The stellar cast, headed up by Bertrand Russell, includes the greatest philosophers, logicians and mathematicians of the era, along with sundry wives and mistresses, plus a couple of homicidal maniacs, an apocryphal barber and Adolf Hitler.
Improbable material for comic-book treatment? Not really. The principals in this intellectual drama are superheroes of a sort. They go up against a powerful nemesis, who might be called Dark Antinomy. Each is haunted by an inner demon, the Specter of Madness. Their quest has a tragic arc, not unlike that of Superman or Donald Duck.

October 1, 2009

Organizations that promote hands-on learning

In the upcoming issue of MAKE, we have a feature in which teachers share their favorite classroom and science fair projects. As an additional online resource for this article, we want to compile a list of organizations that promote hands-on learning.

Photo from the Museum of Science and Industry website

The Exploratorium, the Museum of Science and Industry, TechShop... these are the sorts of places we want to include. So please help us out! Comment on this post with the name, URL, and location of organizations near you that belong on this list.

September 30, 2009

Math Midway

Last night PT and I got to check out the Math Midway (soon to become the Math Museum), including the square trike PT already posted. Check out their website and mine and PT's photos on Flickr. That other lovely lass in the pictures is Alicia Gibb from Bug Labs.

The Math Midway is in NYC until October 14th, at the Urban Academy, after which it will travel to the Da Vinci Science Center in Allentown, PA. This group of exhibits wants to turn into a full-scale museum, so if you're interested in getting involved, now's a good time!

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