I haven't used the QT touch wheel but have used other of the Quantum sensors. In general the simple ones are easy to use, the grid based sensors in my experience are trickier, and more fuss, but this is probably as one would assume.
I had the idea that it might not be too much of a hassle to implement a scroll wheel with just an Arduino. You would only need one "send" pin and maybe four or five "receive" pins, all linked to the send pin with 1 M resistors. You would then send a "burst" (cycle of square waves) from the send pin, to each receive pin (in order). After reading each pin (see the reference) it would be flipped to an input with pinMode().
Then some logic would be required to tell what the user wanted to do - this might actually be the hard part.
If others are interested I'd be willing to try this out and post the code.
e-art: New Technologies and Contemporary Art Ten years of accomplishments by the Daniel Langlois Foundation
September 20 to December 9, 2007 Free Free Admission Jean-Noel Desmarais Pavilion Level 3
e-art: New Technologies and Contemporary Art To mark the tenth anniversary of the Daniel Langlois Foundation for Art, Science, and Technology (DLF), the Montreal Museum of Fine Arts will present works by ten artists from Canada and abroad who have received funding from the DLF. The exhibition e-art : New Technologies and Contemporary Art – 10 Years of Accomplishments of the Daniel Langlois Foundation will present an outstanding selection of spectacular works, some of which were specially commissioned for this event.
This exhibition includes a Philip Beasley piece with 40 networked Bare Bones Boards(Arduinos) that control muscle wire and page motor activators. Also lots and lots of Jim Campbell's work featuring low res LED video and more.
Except for the fact that the Official Arduino hardware is all documented inside the site, so one link would suffice for that, why not a hardware page for "Arduino Universe" or "Visual Guide to Arduino" with any and all boards listed, with the specifications that are missing from just about everyone's boards such as size, weight and current draw. Daniel J. has already started one. The real place for this is in the Playground.
The text without links was something of utopian todo list. Or a roadmap to a (robust open-source) Arduino planet.
They could have links with question marks, that might get them one step closer to reality.
I am amused by the movements of Hardware listings for third party hardware, around the hardware page. It seems that third party hardware needs to be kept as far as possible from "official hardware". They're listed as Arduino-compatibles for clarity, with full referencing of debates, policy and discussion. What's the issue with having them listed under hardware? The core question is: Is there anything except copyright law separating an Arduino-compatible from an Arduino?
I also thought that the Playground was the community section of the Arduino website, and as such might benefit from the absence of the editorial control the Arduino Team exercises on the rest of the site. I had thought the Freeduino wars were about to quiet down and the energy go into more productive pursuits.
While I do think the Arduino community should have the most prominent voices on the Playground (as long as they are courteous), I also realize that I am an interested party, so welcome comments from the rest of the Arduino community. http://www.arduino.cc/playground/Main/ArduinoCoreHardware
PS - The reorganization looks great and is a pleasure to use already, kudos to all who made it happen.
PSS - how does commenting on the history page work? I've yet to figure that out.
I would rather see second and third-level headings with smaller fontsize than first-level being made even more bold. It won't break anything on the site as long as the original authors stayed with the "first level heading is more important than second level heading; etc."
I agree with this - kick the font sizes down on both second and third levels maybe third could stay bold. Anyway - make them look like they should be in order.
I found out that Daniel is really a cybernetic organism. After his graduation from Ohio State University, he was hit by a semi, and basically his whole body had to be replaced by a room-sized support mechanism.
He's really a very lively persona though, and very cute, for an aging male geek, with a robot body.
He had to take some time out to get his software and hardware tuned up, but watch out, he's got a new OS and a new MO.
I've seen all this on Skype so I'm in a position to know.
The LM324 is cheap and a Radio Shack item, but the output doesn't swing within 1.5 v of positive supply, so the highest output you're going to get out of it is 3.5V. This could be OK is you used the AR voltage to scale things, but sometimes it's a fuss.
I like the newer CMOS rail-to-rail types/
I use the TLV2372 - an 8 pin dip dual, (2374 for a quad) rail-to-rail CMOS type, in my classes - around $1.00 LMC6482 is also a dual, (6484 for a quad) is a higher current unit that handles capacitive loads, if you're trying to drive anything with the op-amp. around $2.50
A lot of choosing an op-amp depends on what parameter you're trying to optimize. I'm not an EE either, though.