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January 18, 2010

Mandelbrot set viewer

Adam Wolf, hardware hacker and member of Twin Cities Maker, has created an Arduino-based viewer for Mandelbrot sets. Adam's website provides full shematics and code for the project.

January 14, 2010

The Anywhere Organ nominated for a grant from The Fun Theory

The Anywhere Organ is a amazing musical instrument project that desperately needs your help. By voting right now for The Anywhere Organ you help increase it's chance of receiving a $25,000 grant from The Fun Theory. The Anywhere Organ is the brainchild of über-maker Matthew Borgatti. You might remember some of Matthew's work on MST3shades, Printable Handcuffs, Bokode, the Best of Instructables, and Fairytale Fashion. Act now! (if you like it) The voting ends Friday.

Pipe organs are incredible, awesome instruments. One incredible aspect that contributes to their awesomeness is their ability to play a space. Each space an organ resides in reacts differently, creating different tones, and essentially allowing room for an infinite variety of instruments. Unfortunately nearly every pipe organ in existence is bolted irrevocably into a wall staring longingly at fornications all day. This is why I'm creating the Anywhere Organ.

I've designed a system where each note, each pipe of a pipe organ is attached to a central air supply through a hose. The air to each organ pipe is controlled by a solenoid valve articulated through Arduino. I'm writing modules to take MIDI keyboard information and translate it to the valves. Each hose is independent making for an octopus like instrument where each separate pipe can be installed with care and consideration relative to the space. This means the instrument can be installed anywhere; a park, a fire escape, an abandoned warehouse, a secret underwater cave. The pipes can be distributed to take advantage each location's specific character and personality. It also means that anyone can participate in the project and take a turn. I'd like to get people playing with the Anywhere Organ so they can see the effect space has on music and sound, so they have a public venue to fool around with music, and to have an opportunity to collaborate with other musical artists to create new sounds with it.

January 13, 2010

Intern's Corner: Makey robot's sonar and maiden voyage

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 Kris Magri, engineering intern

How I designed Makey, Part III: The Ping sonar rangefinder and maiden voyage

As we return to our robot design saga, making Makey the Robot for MAKE, Volume 19 ...

The actual robot is still just a prototype with 2 wheels and motors and no sensors, electronics, or brains inside. The better body exists only in the computer. Maker Faire is looming. I've been tapped to give two "Make Your Own Robot" workshops, and I reckon that having a working robot would be a very good idea.

I'm trying to get the Arduino into the robot body. Suddenly I learn a profound lesson regarding computer-aided design. In real life, circuit boards cannot morph through walls into their desired resting place. In the computer, it happens all the time. With a simple motion of the mouse, the Arduino circuit board has glided into place, right through the aluminum robot body ... but in real life, it won't fit. There is no possible angle or tilt that will get the Arduino into the robot. Out come the Vise-Grips and hacksaw. I saw, bend, and twist off the offending aluminum tabs. This is reality-aided design.

The battery pack doesn't fit because it hits the nuts and bolts that hold the motors in. It fit just fine in the computer model, since I didn't bother including the nuts and bolts. I'm ready to toss the computer out the window.

I show up at the Make: Labs with my fail robot. Our crew has been working like demons for weeks getting ready for Maker Faire -- preparing demos, packing everything under the sun, buying materials -- the lab is a madhouse. Eric, myself, and Steven are practically tripping over each other. I'm frantic to get the Arduino into the body and get the sonar sensor mounted somehow. Eric suggests double-stick tape. I refuse. Tape and glue, I assert, are for people who don't know about bolts and rivets. Eric manages to cram the Arduino in sideways. It barely fits, actually, it doesn't quite fit, it sticks up a little. When I drill a mounting hole, 1/3 of the hole isn't there. But the bolt manages to hold.

At this point I only have a vague idea of what motor will be turning Makey's "eyes" or how to fit it inside. We zoom off to the local hobby shop and pay way too much for the smallest servomotor they have in stock.

Steven offers to take on the servomotor/sonar sensor mounting problem. He's making detailed measurements and calculations, trying to figure out how much space there is and where the servomotor will fit into this 3D space without hitting the electronics. He marks everything and explains his calculations to me. I can't follow them, but it sounds good and looks like it might just fit. I drill the holes, we put the servo in, then close up the robot. It fits! There is much rejoicing.

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From MAKE magazine:
make volume 19 cover.gif

In MAKE, Volume 19: Robots, Rovers, and Drones, learn how to make a model plane with an autopilot and a built-in robot brain. We'll also show you how to make a comfortable chair and footstool out of a single sheet of plywood, a bicyclist's vest that shows how fast you're going, and projects that introduce you to servomotors. All this, and lots more, in MAKE, Volume 19! Subscribe here. Buy the issue in the Maker Shed.

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Synth + visuals controlled by light

Jakub's Decaudion project uses Supercollider, Processing, & Arduino along with an array of photocells to create some elegantly simple interactivity. [via Arduino Forums]

Arduino + toilet = performance art

"Noise performer" 23N (a.k.a. Stéphane Perrin) has created a performance called Nunk on Droise.

Simply put, the performance consists in dynamically generating noise music from the alcohol drunk by the performer during the performance. During the performance, the performer drinks alcohol and several breathalyzers are used to generate sounds and interacts with the visual. In addition, the abuse of alcohol inevitably leads to uncontrollable results and the body of the performer becomes itself a musical instrument.

Several alcohol sensors output each a voltage that depends on the alcohol content in the breath of the performer. These voltages are measured by an Arduino board and sent to a program written under OpenFrameworks that processes them and sends them through OSC (Open Sound Control) to a Pure Data patch. The patch dynamically generates sounds from the received data. In addition, the use of a microphone allows the sound emitted by one of the (un)desirable effects of the consumption of various alcohols in a very short time, namely vomiting, to be processed too by the Pure Data patch.

See Perrin's Flickr page for more images, as well as YouTube videos of his Nunk on Droise performances: part one and part two.

More:

January 12, 2010

MIDI exercise bike sets the pace

Toby writes -

I've just finished writing up my first-attempt at converting the reed-switch signal from our exercise bike into MIDI. Makes for an interesting workout when you have to keep pedalling or the music grinds to a halt.

Nice - sounds like a great way to enhance a workout! More project info + source code available @ 55th Floatilla.

Arduino vs. Maple - early impressions

For those that haven't heard, LeafLabs' Maple board is an Arduino-compatible microcontroller platform based on an STM32 ARM Cortex-M3 chip. The full feature list includes -

Microcontroller: STM32 F103RB
Clock Speed: 72 MHz
Operating Voltage: 3.3V
Input Voltage (recommended): 3.0V-18V
Digital I/O Pins: 39
Analog Input Pins: 16
Flash Memory: 128 KB
SRAM: 20KB
64 Channel nested vector interrupt handler (including external interrupt on GPIO's)
Integrated SPI/I2C and 7 Channels of Direct Memory Access (DMA)
Supplies up to 800mA @ 3.3v
Support for low power and sleep modes (<500uA)
Dimensions: 2.05"x2.1"

I recently got my hands on one of these new boards, and although a fully-functioning version of the Maple IDE has yet to be released, I compiled available source files from the project's repository, allowing me to upload a sketch from Windows XP (via Parallels on OS X).

My example sketch uses the shiftOut function to create a sine waveform via an MCP4921 DAC chip. I also ran the same test setup on an Arduino Duemilanove (ATMega328p) and superimposed the two resulting signals for the sake of comparison -

Arduino Duemilanove (ATMega328p) in blue, LeafLabs Maple (STM32F103RB) in green
Note - differing voltage ranges due to difference in DAC VREF (5V, 3.3V)

As expected, Maple's STM32 (running @ 72MHz) updates the DAC a whole lot faster than Arduino's ATMega328p (@ 16MHz) - in fact about 9 times faster! This was a bit of a surprise to me as I'd only expected a 4.5x speed boost considering the difference in clock speeds. Definitely good news for Arduino users in need of extra clock cycles, but for most, the Duemilanove still offers big advantages - specifically:

Maple IDE software still in prerelease development stage
ATMega328p available in easily replaceable DIP package
Lower-level code (i.e. - port manipulation, timer interrupts) used with Arduino would need to be rewritten for the STM32
Arduino widely available in multiple forms, great big user community

In any case, it's very cool to see more options (and speed!) made available to the Arduino community. It'll definitely be interesting to see how things progress with the Maple and its slated relatives.

Homebrew dual-core Arduino

The project consists of a shield you can add to an Arduino equipped with another Altmega 168/328 chip and a whole 'nother set of digital and analog I/O pins.

Instructable user johndavid400 explains:

The shield design can use the base Arduino's power supply or it can supply power to the base Arduino via it's onboard power-terminals and 5v regulator. You can select which power mode you want to use via the on-board jumper selectors.

Using I2C, you can connect 1 Arduino (master) to a host of slave Arduino's through Analog ports 4 and 5.

Also, you can add the security of having a completely separate CPU to your project that is unaffected by any code running on the base Arduino. I use this shield as a failsafe on my R/C lawnmower. The base processor uses the 2 external interrupts to sample and decode 2 servo signals from an R/C transmitter/receiver, while a 3rd servo signal is sent to the Core2duino that controls a relay for the motor-controller power supply. This way, even if there is a problem with the main code and it stops responding, the Core2duino will still be able to carry out it's main function unaffected (which is to kill the power to the bot if anything unusual happens).

[via Embedded Projects]

More:

January 11, 2010

The weather clock

From the MAKE Flickr pool

Sean built a digital weather display with a very analog feel -

I took an old clock, removed the mechanism and replaced it with an Arduino (micro-controller) that checks the weather on the Environment Canada website every fifteen minutes and update the hands accordingly. It also has a web server so I can check the weather and update the settings from a web browser.

He notes that the lowest temp the clock can display isn't quite as low it goes in his neck of the woods. Yowza - it gets mighty cold in Winnipeg! For more info & source code check out the project's blog entry.

January 10, 2010

Gelatin brain mold with arduino synapses

A while ago, I had a spectacularly bad accident on my bike. There was a dog, a leash and a human. The leash acted kind of like a finish line ribbon, but without the breakaway segment they use in the proper races and marathons. I landed on my (helmeted) head. Hard. A few hours later I came to in the ER of the local hospital blabbering to my wife, asking the same questions over and over (and over). They 'offered' to let me stay there a while, so I took them up on the offer and spent the night.

For a long time, I have consistently worn a helmet on every bike ride. It always puzzles me to see adults and kids riding with out proper head protection. I also often see teens with skateboard helmets riding with the straps undone, as if having the protective gear perched on their head is enough to keep it there. Why not clip the straps? If I hadn't had a helmet on and properly secured to my noggin, I'd still be on the hospital feeding program, if I even survived my brief flight.

As I was floating in the ER I got a vision: A brain with little toy objects suspended in it like ideas in a mind. Around the objects are blinking lights acting as synapses. As I recuperated in the days after my misadventure, the image continued to return for further refinement. One of the first things I did on return from the hospital was to order a gelatin mold in the shape of a brain. It arrived very quickly, much sooner than I could have hoped.

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January 9, 2010

Tweeting photos with an Arduino

Here's another impressive Arduino project from Japan. Blogger arms22 combined a serial camera module, Arduino, and Ethernet shield to build a photo-twittering microcontroller (English translation). Hmm, this could be the basis for all sorts of cool projects- I'm thinking statues with eyes that follow you and twitter what they see, what would you make?

In the Maker Shed:

Arduino Family

Make: Arduino

January 8, 2010

Andy Holtin's "Glance"

Andy Holtin, Assistant Professor of Sculpture at American University, in Washington DC, just posted an in-progress video of an installation project he's working on called Glance. He writes:

I'm using the audio line from the DVD to sync eye movement with the Arduino (used the Pro Mini this time and loved it) through an opto-coupler as input. Physically fun, too -- used casting processes to copy some gears, and etched my own PCBs for the first time. Maybe I will do a build blog for this one.

Note to Andy: Please do! [Thanks, Alberto!]

Arduino-powered mood meter

The Arduino-powered mood meter monitors an IRC channel and displays the current "mood" of the maker. I bet a lot of our readers already have all the necessary components to build this project. All you need is an Arduino, a servo, and some tape. Check out the link for the Ruby and Arduino source code.

As long as computers have existed, we've tried to represent the physical world in the virtual one. This trend goes as far back as the punched cards and tabulating machines used in the 1890 United States Census, but it doesn't end there. When computers became common enough that regular people -- without specialized training -- may use them, interface designers went straight for spacial metaphors. We pulled more of the physical world into the machine.

What I find fascinating about hardware hacking, and platforms like the Arduino, is that we can reverse that trend. We can interact with computers through the physical world, rather than interpreting the physical world through a virtual one. And we can do it trivially.

In the Maker Shed:

Make: Arduino

January 7, 2010

Secret handshake of the future

While at the MIT Media Lab earlier this week, I met David Cranor, a student in the Object-Based Media group, who showed me his LilyPad Arduino secret handshake project he made with Amanda Peyton, Arlene Persaud, Rajiv Bhatia, and Sinbae Kim for their Tangible Interfaces class last semester. He writes:

We ironed on conductive fabric pads on different parts of the gloves, and read them off like a multiplexed keypad. The pads on one glove are the rows and the pads on the other glove are the columns, and strobing rows and columns sees what combination of pads were connected to each other). The LilyPad then figures out what gesture is being made and transmits a number through serial to a Processing program which displays the gesture on the screen and checks for the correct pattern.

January 6, 2010

Alarm clock overkill

Spotted in the Make: Forums:

Eric Ayars needed a complicated alarm clock to match his complicated schedule, and thus was born the Alarm Clock Overkill project. Instead of going off at the same time each day, the wake-up alarm can be set to go off at a different time for each weekday. As an added bonus, it also tells the temperature and alerts him to any 'special events' that might be going on that day, such as birthdays or holidays. With an alarm clock this fully featured, who needs a calender!

Original forum post is here.

Bill Gurstelle's article on DIY in The Atlantic

MAKE contributor Bill Gurstelle has an awesome article in the latest issue of The Atlantic about DIY, Arduino and art:

For a few dollars, creative and motivated individuals--rather than just corporations or institutions--can make highly intelligent tools, perfectly customized for a particular need.

...large artistic installations used to require multiple programmers and engineers. But now "artists and designers have the ability to do 100 percent of these projects by themselves and have total control over everything," [artist Dan] Rozin says. "The expertise isn't that specialized anymore."

[Thanks, Leah Buechley!]

January 4, 2010

DIY New Year's Eve LED ball

Garrett Mace, aka Macetech, built this LED NYE ball, using his own Macetech LED controller and Arduino shield kits (and a Seeduino). He writes:

I used six Satellite Modules (high power RGB LED arrays), six ShiftBars (three channel LED controllers), a Seeeduino, and a ShiftBrite Shield to build a New Year's ball for our own mini Times Square event. The ball was a "sparkleball" made of about 120 16oz plastic cups hot-glued together. We threw a rope over a branch and lowered it at midnight...it lit up the whole yard!

2010 New Year's ball

How-To: Laser tripwire with webcam + twitter

Action_owl (awes name!) set up a versatile intrusion detection system using Arduino + Processing -

This instructable will show you how to construct a laser tripwire that can twitter and grab an image from a webcam, as well as execute any command you can put in a bash script. This instructable is actually quite simple and is even suitable as a beginner arduino project. It requires a GNU/linux (or possibly Mac) operating system with the arduino IDE and Processing IDE working properly.

Sounds like a good way to keep an eye on your pad while out and about - check out the full project deets here.

December 31, 2009

10 things to do with a new Arduino

Matt over at Liquidware posted an evolution of simple introductory sketches for those fresh to the world of Arduino. A good starting point for those who find themselves with a new board, the examples require no additional hardware and demonstrate/combine digital output, serial communication, and their relevant functions.

In the Maker Shed:

Make: Arduino

December 29, 2009

Commodore 64 synth chip emulated on an AVR

Because of its classic sounds & serial-controllability, the Commodore 64's Sound Interface Device (SID) chip is much sought after by many synth DIYers. Instead of plucking one from a vintage piece of computing history, Christoph recreated the SID's functionality in firmware using an ATMega8 chip. The resulting emulator can be controlled via serial protocol - an Arduino shield was even designed to do just that.

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