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November 4, 2009

Digital Mixtape plays mp3s old school style

MAKE subscriber Justin fused the convenience of digital music with the feel and playback functionality of a cassette -

It is a cassette tape adapter and a micro usb port hooked up to a tiny mp3 player that I picked up at target. Its a simple build and only took an evening. Its an on going project I started a while back.

Neat idea! More pics plus earlier versions of the project can be found on Justin's blog. Hmmm ... maybe the next incarnation could have FF/REW capabilities triggered by turning the spools?

Posted by Collin Cunningham | Nov 4, 2009 04:30 AM
Electronics, Music, hacks | Permalink | Comments (7) | Suggest a Site

iPod touch POS system

If you've ever shopped at an Apple store you've probably experienced their relaxed point of sale (POS) system. You walk in, try out new gear, talk to a sales rep, swipe your card, sign a screen, blurt an email address, and you're out of there. Usually you skip the register, yet your wallet always seems lighter after each visit. It's all very smooth and thought out. But something has always bugged me about the whole process. The sales reps have always used a third-party mobile device to complete the transaction. It just didn't go well with the jeans and black turtleneck vibe.

Well, it would seem that Apple has picked up on customers pestering them about this minor user experience discrepancy and are about to remedy the situation with a new POS system based on their wildly popular iPod touch mobile entertainment device. Dubbed EasyPay, each unit will consist of a iPod touch and a special case which houses a barcode scanner, card reader, extra battery and mini-USB connector. The system runs custom POS software and uses a Pogo Sketch stylus to capture cardholder signatures.

Apple's new iPod touch-based EasyPay checkout [via AppleInsider]

In the Maker Shed: Gennai Hiraga's Spark Generator

Hiraga Gennai (1729-79) was an Edo period Japanese pharmacologist, physician, author, painter, and inventor who is well known for his Erekiteru (electrostatic generator). The Gennai Hiraga's Spark Generator kit by Gakken replicates his early work in creating static charges. Easy to build -- instructions are in Japanese but feature highly detailed assembly pictures (sorry, no English translation at this time).

MAKE is proud to be the exclusive distributor in North America for these brilliant kits from Gakken.

Giger: Custom humanoid robot

Giger is a really cool looking humanoid robot with impressive specs. The bot stands about 2 feet tall, weighs in around 11 lbs, has a WiFi camera, and runs embedded Linux. Did I mention it cost $10,000 to build! I guess all those actuators are expensive!

Steampunk exhibition documentary

Here's a very nice bit of video documenting the recent Steampunk exhibition at the Museum of the History of Science, University of Oxford.

Steampunk Art @ Oxford

All-Sky Milky Way Panorama 2.0

Axel.Mellinger Mwpan2 Aitoff 1200X600
Stunning...

Between October 2007 and August 2009, a new digital all-sky mosaic image was assembled from more than 3000 individual CCD frames. Using an SBIG STL-11000 camera, 70 fields (each covering 40° × 27°) were imaged from dark-sky locations in South Africa, Texas and Michigan. In order to increase the dynamic range beyond the 16 bits of the camera's analog-to-digital converter (of which approx. 12 bits provide data above the noise level), three different exposure times (240 s, 15 s and 0.5 s) were used. Five frames were taken for each exposure time and filter setting. The fields were photometrically calibrated using standard catalog stars and sky background data from the Pioneer 10 and 11 space probes. The new panorama has an image scale of 36 arcsec/pixel (approx. 3× the resolution of the old, film-based mosaic), a limiting magnitude of approx. 14 mag and an 18 bit dynamic range. At full resolution and bit depth, it is a 648 MPixel, 7.7 GByte FITS cube. Unlike the old image, the new panorama was carefully calibrated to preserve the large-scale star and dust clouds.

Instrumentube: Play instruments on YouTube

Want to rock out, but forget to bring your instrument? Then you might want to check out Instrumentube, a collection of YouTube-based instruments that you play by dragging the video time slider to match up to the correct note. I can't imagine this being a very efficient way to play music, but it is a pretty funny hack.

[Thanks, Jacob!]

BIBI, the "plastician"

BIBI is a French artist who almost entirely uses trash plastic in his art. He calls himself a "plastician." [Thanks, Karen!]

BIBI, Plastician Artist

Eavesdropping on the moon, circa 1969

In July, 1969, a ham radio operator named Larry Baysinger, from Louisville, KY, used a 20-year old radio from an army tank and a homemade folded dipole antenna array to listen to the Apollo 11 astronauts on the moon. This page is an archive with the original newspaper piece, photos, PDFs of a couple of radio hobby mags and books of the time, and a sort of where are they now update. MP3 of Baysinger's recordings of the audio are also there. Fascinating stuff.

Lunar Eavesdropping in Louisville, Kentucky

Functioning X-men "Pyro" costume flamethrower appliance

pyro_costume_build (Custom).JPG

OK, my awesome meter has kind of overloaded on this one. Everett Bradford's "Prometheus Device" is a hand-mounted appliance that shoots, like, real fire. It looks, you know, dangerous, and all, but it's so cool I don't really care. And he's done a great job documenting the build, although obviously no one should attempt this who doesn't know what they're doing. Amazing work, Everett. Thanks!

Make: Halloween Contest 2009

There's still time left to enter the Make: Halloween Contest 2009! Deadline is 11:59 PM PST, November 3rd. Show us your embedded microcontroller Halloween projects and you could be chosen as a winner.

Type chess set

Linda and John Meyers built this beautiful chess set using typography, a scroll saw and boxes (in the form of a old type-holding tray). It's from Wary Meyers' Tossed & Found, their new book about re-purposing found objects. [via dudecraft]

Alien twins life support system haunt prop

alien_twins_01 (Custom).jpg

John Russell made this fantastic haunted house prop. In his own words:

Two aliens contained in suspended animation chambers. A central control unit monitors and sustains life support functions. The control screen is a looping flash animation. Every few minutes, a malfunction state is triggered. Sound and graphics announce the error, and a Make Controller board is used to trigger emergency flasher lights and a fog machine (simulates a cryogenic coolant leak).

The video shows the system going into its "malfunction state." Awesome work, John!

Make: Halloween Contest 2009

Make: NYC Meeting November 12

If you tried to go to the last Make: NYC meeting and were thwarted, like me, by the police blocking the street (for an unrelated construction problem), you'll be happy to read this announcement for the next Make: NYC meeting, featuring fewer cops!

Make:NYC Meeting 16 - Thursday November 12th, 6:30PM

We're bringing back a favorite challenge for all you makers! We're excited to see how new faces and new ideas can take this challenge to the next level

Challenge: Return of the Blimps

You've got brains, we've got blimps! Three teams will compete to make ordinary RC blimps perform extraordinarily. We'll provide the blimps, helium and some standard Make:NYC challenge materials. Arrive on time to make sure you get in on all the lighter-than-air action cause it's gonna be a blast!

Show and Tell

Meet your fellow NYC Makers and show off your creations! Bring your gadgets, gizmos, sketches, ideas, anything you'd like to put in the spotlight. We encourage NYC Makers to collaborate on and discuss DIY projects. If you're planning to bring a project, drop us a note at meetings@makenyc.org.

If you'd like to attend we have plenty of space for everyone, but please RSVP!

Make: NYC meeting 16
Thursday, November 12th, 6:30PM
Bug Labs
598 Broadway at Houston, 4th floor
New York, NY 10012

Do you have an event coming up? Check out the Maker Events Calendar and add yours!

Build a voice-powered RF transmitter

Fred points out this schematic for a rather interesting radiotelephone transmitter instantaneously powered by the operator's voice -

One of the neatest minimalist amateur radio transmitter circuits around - this one is voice powered - it provides DSB, (double side band)modulation and power from an ordinary 8-ohm speaker - if are in doubt that the circuit works, the maker has the contacts and the voice recordings to prove it!

An explanation of how it works + schematic and audio sample can be found on the El Silbo page.

Tic-Tac-Toe computer learns with beans

James Bridle built this version of Donald Michie's Tic-Tac-Toe solving computer, MENACE (Matchbox Educable Noughts And Crosses Engine). Not what one would think of as a typical 'computer', the instruction to choose the next move is performed by the user. To do this, they select a bead at random from the matchbox that represents the current game state. The type of bead then represents the move that the computer makes.

At first, the machine has an equal chance of making each possible move, but this is corrected by adding or removing beans at the end of each round. The way this works is that if the computer won the round, an extra bean of the same type played is added to each box involved in that round, to make it more likely that the computer will choose the same path on the next game. Likewise, beans are removed from the path if the computer loses, to decrease the chance that it chooses that path next time. This way, the computer slowly 'learns' to play the game correctly, merely by counting beans.

James uses this algorithm to demonstrate the awesomeness of scale. This strategy should work for learning any game, however it quickly becomes infeasible to make a set of matchbooks large enough to represent anything but the simplest game. For instance, he estimates that a computer to play the game Go would be at least the size of the Crab Nebula!

If you are curious, there is a (Windows only) simulator of MENICE here. [via boingboing]

New synth engine for Arduino Pocket Piano!

Designed for use with the Pocket Piano shield for Arduino, Marc Nostromo's Squealer synthesis engine-

The engine implements a small monosynth with a few waveforms, a HP/BP/LP continuous resonant filter, decay and a few little own tricks that generate a LOT of aliases, making a great dirty digital synth. Since the Pocket Piano has only 3 potentiometers available for control (the 4th one being hardwired to the volume), I use a "page" system to implement series of 3 parameters to fiddle with. To switch "page", use the rightmost note of the A.P (NOT the one under the led, the one left to to it). To help you know which page you are at, you can use the led: it will flash a number of time equivalent to the current page you are at.
Here's the parameter list:

Page 1: wave selection / octave / release

Page 2: filter type (continuous lp-bp-hp) / filter cut-off / filter resonance

Page 3: wave loop position / wave loop length (makes the oscillators go wako)

The audio samples sound quite awesome! Grab the relevant Arduino code here. [via Create Digital Music]

District 9 SPLAT gun replica prop

Instructables user msraynsford presents this detailed tutorial on how to build a prop replica of one of those District 9 guns that makes intelligent, loving, civilized creatures explode with a nauseating SPLAT. I want one!

Notebook based on "Jacob's Ladder" principle

You kind of have to see this thing move to get the point. The brand name is RevolveR and, apart from novelty, the "floating spine" binding seems to serve no particular function. Still, it's pretty delightful, and seems to operate on the same principle as the toy commonly known as a "Jacob's Ladder" (Wikipedia). [via Boing Boing]

Alex Rider Eagle Strike book giveaway!

As a special preview for our upcoming Alex Rider Dream Gadget Contest, we're giving away two copies of Eagle Strike by Anthony Horowitz, part of the Alex Rider series! Just leave a comment in this post and tell us why you or your kid(s) needs one of these books. That's all you need to do to enter! Please make sure you include your email address in the comment form field (it won't be published). All eligible comments will be closed by Noon PST on Sunday, November 8th. The winners will be announced next week on the site. Good luck!

Alex Rider's Smokescreen Bike Pump: contest preview

On November 17th, we'll be launching the Alex Rider Dream Gadget Contest, to coincide with the release of the next chapter in Alex's adventures, Crocodile Tears . The book comes out the same day that MAKE, Volume 20 (the kid-themed issue) hits newsstands! In case you're unaware, Alex Rider is a young spy whose exploits are chronicled in a popular series of teen spy/adventure books. Alex uses all sorts of crazy high tech contraptions, made from things in his school backpack, to get out of sticky situations.

Attention all adventure-seekers, gadget lovers, and closet inventors. You are invited to join in the fun! If you were Alex Rider, what gadget would you want in the upcoming adventure Crocodile Tears? Design your Alex Rider dream gadget, inspired by an everyday object (i.e. an iPod, a toothpaste tube, a pen). The winning gadget will be built here at MAKE Labs. Send us a schematic, tell us what your gadget is made from, and how it works. Your entry can be a schematic, sketches, and/or an explanation by you. Remember that the winning gadget should be inspired by an everyday object that one could realistically build (as much as we wish we could create a pair of scissors that fly us to the moon)!

For the next two weeks, we'll be offering excerpts from the Alex Rider books, highlighting the fantastic, clever (and entirely fictional) gadgets used by Alex. Up this week is the Cannondale Bike Smokescreen Bike Pump from Eagle Strike.

Cannondale Bad Boy Bike Smokescreen bike pump:This is activated by the blue button. The pump included with the modified Bad Boy does not, in fact, work as a pump; the flat-free tires should mean that punctures and deflation are never a problem. Instead it contains a miniature smoke machine designed to facilitate evasion of pursuers.

The smoke machine heats a mixture of distilled water and propylene glycol and forces it into the air under pressure. The smoke is dense and nontoxic. Because it is heated, it tends to rise slowly; this means that the screen should work to mask the bike rider for thirty seconds before the fluid reservoir runs out, and for a further ten seconds until it disperses. Times may differ in windy conditions.

The heating coil wrapped around the fluid tank will heat the contents to the correct temperature in under one second. The batteries powering it contain enough charge for one use and, like the fluid, must be replaced afterward.

You can download the high-res schematic for the bike pump and download a sample chapter from Eagle Strike to see how Alex uses it to get out of trouble.

Disclaimer: Excerpts from Alex Rider: The Gadgets by Anthony Horowitz are fictional and for inspiration only. Readers should not attempt to recreate these gadgets.

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