Posts with «turntable» label

Automated Turntable For 3D Scanning

Those just starting out in 3D printing often believe that their next major purchase after the printer will be a 3D scanner. If you’re going to get something that can print a three dimensional model, why not get something that can create said models from real-world objects? But the reality is that only a small percentage ever follow through with buying the scanner; primarily because they are notoriously expensive, but also because the scanned models often require a lot of cleanup work to be usable anyway.

While this project by [Travis Antoniello] won’t make it any easier to utilize scanned 3D models, it definitely makes them cheaper to acquire. So at least that’s half the battle. Consisting primarily of a stepper motor, an Arduino, and a EasyDriver controller, this is a project you might be able to assemble from the parts bin. Assuming you’ve got a pretty decent camera in there, anyway…

The general idea is to place a platform on the stepper motor, and have the Arduino rotate it 10 degrees at a time in front of a camera on a tripod. The camera is triggered by an IR LED on one of the Arduino’s digital pins, so that it takes a picture each time the platform rotates. There are configurable values to give the object time to settle down after rotation, and a delay to give the camera time to take the picture and get ready for the next one.

Once all the pictures have been taken, they are loaded into special software to perform what’s known as photogrammetry. By compiling all of the images together, the software is able to generate a fairly accurate 3D image. It might not have the resolution to make a 1:1 copy of a broken part, but it can help shave some modeling time when working with complex objects.

We’ve previously covered the use of photogrammetry to design 3D printed accessories, as well as a slightly different take on an automated turntable a few years ago. The process is still not too common, but the barriers to giving it a try on your own are at least getting lower.

PC Fan hack lets you scra... scra... scratch analog audio, ah-yeah (video)

Digital DJ controllers let would-be grandmasters get up to all sorts of fancy new tricks, but if you're one of those old dogs who can't be taught, then this PC-fan-come-DJ-turntable might tickle your fancy. Connected to an old-school personal cassette via an Arduino, with a little voltage level smoothing in the mix, moving the fan "scratches" the audio, by controlling the speed of the tape player. The initial plan was to have the fan spinning with the music, like a real turntable, but as you'll know if you've ever caught your finger in one of these things, it's probably best it didn't work out. Despite its home-made charms, one final flourish is VU style LEDs for some mixer-style visual feedback. Alas, there's no built in cross-fader, so don't start work on that DMC routine just yet.

Continue reading PC Fan hack lets you scra... scra... scratch analog audio, ah-yeah (video)

PC Fan hack lets you scra... scra... scratch analog audio, ah-yeah (video) originally appeared on Engadget on Tue, 22 Nov 2011 04:29:00 EST. Please see our terms for use of feeds.

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Engadget 22 Nov 09:29
arduino  audio  dj  hack  led  pc fan  pcfan  scratch  turntable  video