When [DonHo] sang about tiny bubbles, he probably wasn’t thinking of them embedded in glycerine. But that’s where the bubbles in [ShinodaY]’s clock reside. The viscous fluid holds the bubbles better allowing the time to be read more easily. You can watch the relaxing display in the video below.
The theory of operation is simple and reminds us somehow of a reverse Tetris game. Solenoid valves at the base release air bubbles to form a row of the display. The bubbles rising makes room for the next row. The display has as many columns as there are air outlets at the bottom. Spacing the bubble pixels is as simple as adjusting the timing between air bubbles.
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[Craig Shultz], a mechatronics grad student at Northwestern University, sent us a video of his group’s project from last winter: a 3D bubble display. We’ve seen some pretty impressive and innovative bubble displays around here—most recently the 60-tube RGB LED build—but [Craig’s] is the first we’ve seen that adds some depth to the project.
For the most part, its construction is what you’d expect: an acrylic case enclosing the 4×4 arrangement of tubes, 16 valves 16 individually controlled solenoids, and some small air pumps; all driven by a PIC microcontroller. In the video, however, you’ll have to strain your eyes if you want to see the tubes, which is a clever design choice on [Craig’s] part to showcase the display’s depth. Each of the bubbles was visually separated by pairing glycerin with a tubing material that had a similar index of refraction, Pyrex. As a result, the tubes blend seamlessly into the fluid. Check out the video after the break.
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Many of our cherished computers and consoles from the past have not stood up well over time. It’s not the hardware as much as the color. From Commodores, Apples, to Super Nintendos, the machines have slowly drifted towards a sickly yellow and even brown. The culprit appears to be the fire retardant chemicals used in the plastics. Amiga enthusiasts have spent the last year perfecting a technique that restores the plastic of these machines to its original splendor. Dubbed ‘Retr0brite‘ it’s a gel made from hydrogen peroxide, xanthan gum, glycerine, and ‘Oxy’ style laundry booster. The results are really impressive. If you do start restoring your own machines, caution should be used since it requires strong concentrations of hydrogen peroxide typically employed in bleaching hair.