Joel Frahm the Quotemaster 
Thursday, June 11, 2009, 05:32 PM - Jazz
Tenor sax virtuoso Joel Frahm was playing his regular Tuesday-night gig at La Lanterna in NYC this week, accompanied by Bill Campbell at the drums (as usual), and Johannes Weidenmuller at the bass (replacing Joe Martin). Joel is something of a "quotemaster": his solos are often peppered with snippets from all kinds of things from other jazz pieces, classical music, pop music, and just about anything under the sun.

This Tuesday, Joel was in a particularly playful mood, and his high-flying solos brought an unusally rich harvest of detectable/delectable quotes including such things as Peter and the Wolf, Michel Legrand's "Les moulins de mon cur" (Windmills of my mind), and (that's got to be a first) a theme from Star Wars!

Over the last 3 months, photographer Jimmy Katz has come to 8 or 10 of Joel's trio sessions at La Lanterna, equipped with a compact digital multi-track recorder. Each session he recorded has about 3 hours of music. Hopefully, these will soom be distilled and made available.

By ze way, the complete collection of Joel's sessions at Small's are available for on-line listening here.
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Huuuge collection of 3 views 
Saturday, June 6, 2009, 04:09 PM - Flying Contraptions
Bertrand pointed me to this positively gigantic collection of airplane 3 views at rcgroups.

They even have one of my favorites: the obscure the coleoptere.

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cyclogyro 
Thursday, May 14, 2009, 07:06 PM - Flying Contraptions
There seems to be a renewal of interest in the heretofore abandoned concept of the cyclogyro

The cyclogyro has two rotating sets of "paddles" whose angle of attack is cyclically modified to create lift in the desired direction. The principle is well described by the animation in this Wikipedia article.

There is a YouTube video of a thethered micro-size cyclogyro, which was designed at the National University of Singapore. A detailed description of the design is available here.

A team of Japanese roboticists has apparently revived the concept, using a "pantograph" mechanism to vary the angle of attack (link to IEEE Tans. Mechatronics article),
and a short description with pictures on PhysOrg.

I'm somewhat doubtful of the efficiency of the design, but it looks like a fun thing to build.

There is a number of article on the web that describe 1930's designs for cyclogyros. I am somewhat surprised that none of these designs seem to include an anti-torque system. These paddles are bound to generate a high torque that would make the vehicle pitch up (which is why the cyclogyro on the YouTube video has a propeller in the back).


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Rovio robots play soccer at NYU 
Thursday, May 7, 2009, 11:39 PM - Robotics
This past semester, I have been teaching an undergraduate course Introduction to Robotics. The first series of assignments included programming Arduinos to read sensors and actuate servos and DC motors. The second series included programming a Pololu 3Pi robot to follow a line (using a PID controller), and perform dead reckoning (coming home after following a line to its end).

The last series of homework consisted in getting Rovio robots to play soccer. I feel I should mention this here because the class page showing videos and pictures of the students' soccer-playing Rovios had been mentioned by a number of blogs, including Slashgear and RoboCommunity.

The Rovio robots can be seen as "Wifi webcams on wheels". The goal of the project was to push a tennis ball into a goal. The tennis ball is bright yellow, and the goal posts are red. The rovios are controlled by software running on a laptop which performs the vision and control algorithms. The software is written in our very own Lush language, which is a dialect of Lisp.

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Bill McHenry at La Lanterna 
Wednesday, April 1, 2009, 12:57 AM - Jazz
Tonight at La Lanterna in NYC tenor sax Bill McHenry was sitting in for Joel Frahm, with bassist Joe Martin and drummer Bill Campbell. They played two of Bill McHenry's new compositions "Violetta" and "Lines" which I thought were particularly interesting.

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micRo CNC kit 
Thursday, March 26, 2009, 03:00 AM - Misc TechnoToys
Lumenlab proposes the micRo CNC kit for $500 for a partial kit and $1000 for a complete kit. You can also get a low-end Dell PC to control the CNC machine for $330, pre-configured with Ubuntu.
The total travel dimensions are 34cm x 25cm x 8.9 cm.

[via Makezine blog]



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XBee carrier boards 
Thursday, March 26, 2009, 02:50 AM - Electronics
The Makershed has a new XBee adapter for $10 with 10 pins, some which directly fit in an FTDI serial USB adapter cable. It includes level shifters and a 3.3v regulator and can be plugged into a proto board.

Newmicros also has an XBee USB dongle, for $40.

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Cheap dual wireless cameras 
Saturday, March 14, 2009, 09:09 PM - Electronics
Intelspy sells a surveillance system with two wireless cameras and a 2-channel receiver for $130. The interesting thing is that the claimed range is over 500m.
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Arduino-based magnetic levitation 
Saturday, March 14, 2009, 09:00 PM - Electronics
A cool little hack in which an Arduino is used to levitate a magnetic object and regulate its distance from the levitating electromagnet.
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Arduino JEP shields 
Monday, March 9, 2009, 10:04 PM - Electronics
This page has a bunch of interesting prototyping shields for the Arduino, including relays, power FETs, motor drivers and such (via Makezine blog).


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Micro RC Spitfire RTF from Plantraco: 1.7g and 15cm wingspan 
Thursday, March 5, 2009, 07:47 PM - Flying Contraptions
Micro RC manufacturer Plantraco has a Ready-to-Fly 1/72 scale RC Spitfire, with a wingspan of 15cm, and incredible weight of 2.7 grams. The plane is available for $99 including the radio. It uses a 4mm coreless motor with a 32mm prop, a 0.38g 2channel receiver (rudder and throttle), a 0.07g rudder actuator, and a 0.95g 20mAh lipo battery.

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Akai EWI 4000s patch editor for Linux 
Sunday, March 1, 2009, 01:52 AM - Misc Music
I just noticed this nice Akai EWI 4000s patch editor/librarian app called EWItool. The best part is that it runs on Linux (as well as on Windoze). There is a pre-compiled debian package too.

It can automagically fetch patches from EWIpatchExchange.

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WRAM show 
Monday, February 23, 2009, 01:28 PM - Misc TechnoToys
The WRAM show is an R/C modeling trade show that takes place every February at the Westchester county center in White Plains, north of the New York City. The show usually occupies two floor and the booths are filled with manufacturers, importers/distributors, and retailers showing their exotic gear. This year however, the show was rather disappointing and occupied only one floor. Many of the manufacturers that usually have a booth were absent, and many of the big on-line retailers like Hobby Lobby and BP Hobbies were absent. It looks like the economic crisis is having an impact.

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Random fun links of the day 
Monday, February 23, 2009, 01:03 PM - Misc TechnoToys
- Box2d-js is a physics engine written in Javascript. It's automatically translated from the popular Box2D engine which is written in Flash.

- Trace En Poche (which could be translated as "pocket plotter") is an amazing on-line tool geometry, kinematics, and plotting tool. It allows you to enter descriptions of geometric figures using a GUI or a simple description language, and to plot and animate the result. The tool is available in a number of languages (French, English, Spanish, German, and Arabic). Thanks to Bertrand for the pointer.

- Command-line-fu: a bunch of random semi-non-obvious Unix/Linux command-line idioms to do various useful tasks. These simple tricks will occasionally aleviate the need to plow through the man pages of find, awk, egrep, sort, and such.

- Diamonds in the Sky: a collection of scientifically correct astronomy-related science fiction stories (sponsored by NSF).

- GPS homing device: Hammacher-Schlemmer has a simple GPS homing device for $80. Press a button when you are at a particular location, and the device will keep track of the distance and bearing to that location. It's small and simple to use. It integrated a self-calibrating digital compass in addition to a GPS.

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Universal Robots: fantastic play. Totally r0kz 
Friday, February 20, 2009, 12:28 AM - TechnoPolitics
I went to see Universal Robots, the play by Mac Rogers at the Manhattan Theater Source yesterday. It's a fantastic play, very clever. The play is quite long (about 2.5 hours, or 3 hours including the intermission), but it is riveting from beginning to end. Each little dialogue and detail that seems gratuitous at first turns out to have major consequence for the future of humanity. The play feels like an elaborate scaffolding in which every small part plays an important role in keeping the construction together.

Practically every moral, social, and political issue raised by the possible emergence of intelligent robots is raised during the play: the military funding of scientific research, the political control of a unique and powerful technology, the role of human labor in an automated world, robotic wars, robot pain, robot morals, robot love, robot compassion, robot sex....

Go see the play. It's on until March 7 (and come to the panel discussion on Saturday Feb 21 at 3:00PM).
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Minoru stereo webcam now works under Linux 
Tuesday, February 17, 2009, 02:53 AM - Robotics
Thanks to Laurent Pinchart, maintainer of the uvcvideo driver, the Minoru stereo webcam now works on Linux.

If you are in a hurry to get it to work, here is the installation process under Ubuntu (or any Linux distro with kernel version 2.6.27-xx):
0. make sure you have installed the linux-headers package, probably called linux-headers-generic.
1. download Laurent's latest driver from linuxtv.org (click on the .gz link near the top of the page).
2. do "tar xvf <the-file-you-just-downloaded>". This will make a directory named "uvcvideo-XXXXXXX" in the current directory. cd to that directory.
3. do "make", and "sudo make install".
4. plug in the Minoru webcam.

The left and right webcams will appear as /dev/video0 and /dev/video1 (unless you already have a video device plugged in). You can grab from both cameras simultaneously at 640x480 at 15 frames per second, or 320x240 at 30 frames per second.

Thanks to Laurent for the quick fix, to Jan Ciger for testing the patches, and to Steve Jamieson and David Holder from Minoru for being supportive.

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