Rubik’s Robot So Fast It Looks Like a Glitch in the Matrix

From Ferraris to F-16s, some things just look fast. This Rubik’s Cube solving robot not only looks fast, it is fast: it solved a standard cube in 380 milliseconds. Blink during the video below and you’ll miss it — even on the high-speed we had trouble keeping track of the number of moves this solution took. It looked like about 20.

Beating the previous robot record of 637 milliseconds is just the icing on the cake of a very cool build undertaken by [Ben Katz]. He and his collaborator [Jared] put together a robot with a decidedly industrial look — aluminum extrusion chassis, six pancake servo motors with high-precision optical encoders, and polycarbonate panels for explosion containment which proved handy during development. The motors had to be modified to allow the encoders to be attached to the rear, and custom motor controllers were fabricated. [Jared] came up with a unique board to synchronize the six motors and prevent collisions between faces. Machine vision is provided by just two PlayStation Eye cameras; mounted at opposite corners of the enclosure, each camera can see three faces at a time. They had a little trouble distinguishing the red from the orange, which was solved with a Sharpie.

[Ben] and [Jared] think they can shave a few milliseconds here and there with tweaks, but even as it is, this is a great lesson in optimization and integration. We’ve covered Rubik’s robots before, like this two-motor slow and steady design and this six-motor build that solves a cube in less than a second.

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PS3 Eye Lives Again Thanks To Low Prices

[Henry Tonoyan] has started getting into OpenCV and digital control system projects. He needed a decent webcam that could do higher than standard frame rates. As it turns out, the PS3 Eye is actually a pretty capable little camera. Now that it’s kind of obsolete, you can have it for as little as $7 from places like Amazon!

The PS3 Eye has a standard USB interface, and after messing around with it a bit in Linux, [Henry] was able to adjust the frame rate settings for his application. He’s using a library called video for Linux with an application called qv4L2. It’s capable of 60fps at VGA, which we admit isn’t amazing, but at $7, we can’t complain — if you drop down to QVGA (320×240) you can go up to 120fps.

From there you can play around in OpenCV to your heart’s content.

Seeing as the Eye has been out for over 7 years now, it has been used in quite a few hacks since then. From an actual eyeball tracker (seriously), to an interactive projection globe with touch tracking to even a physical tower defense game.