Mechanical Musical Sculpture Recalls The Four Muses

Music was created by humans, but often we find ourselves creating performances with machines. [Alana Balagot] and [Federico Tobon] did just that, constructing the stunning 4 Muses musical sculpture with their combined talents.

4 Muses is made up of four individual instruments, under the command of a single keyboard controller. The keyboard can be used to play the instruments live, or alternatively, can learn from the player or be used as a sequencer. It can also act as a simple device to play back music using the four instruments.

The pipe instrument uses servo-controlled valves, which allow air from a blower fan to reach several wood pipes. The xylophone instead uses solenoids to play its 13 tines. Percussion is provided by a mechanized cajón drum, using motors to actuate mallets that strike the various sections of the box. Meanwhile, hackers will be familiar with the concept of the motor-noise instrument, which drives stepper motors at different frequencies to generate tones.

Inside, a cavalcade of microcontrollers make everything work, from Arduino Megas and Teensys to NRF24s sending wireless packets from the controller to the instruments. [Alana] and [Federico] go in-depth with their documentation, highlighting the challenges they faced putting together the various instruments and showing how the final build came together.

Built with and brass hardware and sporting a variety of exquisite wood finishes, the final result is a quartet of machines that play beautiful music composed by [Alana] herself. Musical sculptures are often a great example of the artistry possible when putting electrons to work. Video after the break.

Continue reading “Mechanical Musical Sculpture Recalls The Four Muses”

Turkey fryer

Why Deep Frying Turkey Can Go Very Wrong

Tomorrow is Thanksgiving and that means Americans across the United States will be cooking up a turkey feast. One of the most popular ways to cook the bird is by deep frying it in oil.

Local TV stations everywhere spend this week warning about turkey frying. They’re not wrong… if things get out of hand you can end up burning down your house, if not your entire street. Let’s talk the science behind November turkey fires, and hopefully avoid a turkeyferno.

Simple Errors

The typical setup for deep frying a turkey involves lowering the bird into a big pot full of oil sitting on a gas burner. Ropes and pulleys are often used to lower the turkey into the pot to avoid getting one’s hands near the hot oil. Ideally, this should be done in a backyard, away from structures, to provide good ventilation and plenty of room in the case something does go wrong.

Continue reading “Why Deep Frying Turkey Can Go Very Wrong”

Sam testing the motor on his ebike

E-MonoWheel

Generally, monowheels are that wacky, wildly futuristic transport that we lump in the same category as hoverbikes and jetpacks: strange, currently impractical, but very cool. Not content with waiting for the distant future, [Sam Barker] made his own electric monowheel. (Video, embedded below.)

The hardest part of any monowheel is that the outside rim needs to stand enormous abuse. It supports the weight of the vehicle and provides most of the structural integrity, but also is the means of propulsion. [Sam]’s first thought was to use a trampoline frame as it is a round and reasonably sturdy tube steel. He 3D printed the rollers that connected the subframe to the trampoline frame. Flat bar stock was used to make the angles inside the subframe and straight tube steel connected the inner frame into a trapezoid. The trampoline frame was welded together and on the first test spin, it broke apart from the stress. It simply wasn’t strong enough.

Not to be dissuaded, he found a company that bends steel into custom shapes. He stole the e-bike kit from another bike he had converted earlier, and the wheel was turning. Some handles and foot-pedal later, it was time for a proper test drive. Overall, the result is pretty impressive and the double-takes [Sam] gets while riding down streets in town are wonderful. If you’re looking to scratch the monowheel itch, check out this wooden monowheel.

Continue reading “E-MonoWheel”

You Can’t Upgrade Soldered-On Laptop RAM? Think Again

Upgrading the memory in a computer is usually a straightforward case of swapping out a few DIMMs or SODIMMs, with the most complex task being to identify the correct type of memory from the many available. But sometimes a laptop manufacturer can be particularly annoying, and restrict upgradability by soldering the RAM chips directly to the board. Upgrading memory should then be impossible, but this reckons without the skills of [Greg Davill], who worked through the process on his Dell XPS13.

The write-up is a fascinating primer on how DRAM identification works, which for removable DIMMs is handled by an onboard FLASH chip containing the details of the chips on board. A soldered-on laptop has none of these, so instead it employs a series of resistors whose combination tells the BIOS what memory to expect. Some research revealed their configuration, at which point the correct chips were sourced. Surprisingly it’s not as easy as one might expect to buy small quantities of some RAM chips, but he was eventually able to find some via AliExpress. An aside is how he checked the chips he received for fakes, including the useful tip of hiring a dentist to take an x-ray.

The final step is the non-trivial task of reballing and reworking the new BGAs onto the board, before testing the laptop and finding the process to be a success. We’ll leave you with his final words though: “But next time I think I’ll just buy the 16GB variant upfront.“.

We’ve seen quite a lot of [Greg]’s work here at Hackaday, one of his most recent was this amazing LED D20.

Cracking Open The Prince Floppy After The Purple Reign

Readers of a certain vintage will no doubt remember the time when Prince eschewed his royal position and became an unpronounceable symbol. People had no choice but to refer to him as TAFKAP, The Artist Formerly Known As Prince, and members of the music press were sent a 3.5″ floppy disk with a font file containing a single character — that gender-transcending shape that would soon become another one of Prince’s guitars. But it’s 2021, and now you can get it from the Internet Archive. Fun fact: the file wasn’t ever locked down. In fact, the symbol was available on Prince’s Compuserve and fan club CD-ROM.

While some people trawl auction sites for overalls and weird keyboards, others look for ridiculous items from the zeitgeist, like a copy of this floppy. Take [Anil Dash] for instance. [Anil] finally pulled the trigger after 15 years of debating this particular purchase. [Anil]’s interest was reignited after reading this analysis of whether the symbol could ever be put into Unicode. (Between being trademarked, a logo, and a personal character, it’s ineligible for inclusion.)

Earlier this week, [Anil] teamed up with Adafruit to extract the data from the floppy. The Twitter thread that ensued led readers to another old source of the font — the 1994 game Prince Interactive. We wonder if they broke out the oscilloscope, though it doesn’t look like it.

Thanks for the tip, [pt and limor]!

X-ray image of a camera lens

Observing A Plant’s Vascular System With X-Ray Video

[Ben Krasnow] has a knack for showing us what’s inside of things while they’re moving. This week’s Applied Science experiment has him making time-lapse X-ray videos of things. This plant’s vascular system is just one of a few examples, the others being a dial clock and the zoom lens on a DSLR.

X-ray of plantThe trick here is having an X-ray sensing panel that can be reused. It takes around five seconds of exposure to grab each 40×40 cm frame which are then assembled back into video.

Now watching mechanisms move is cool — [Ben’s] video back in 2015 to show what a phonograph needle in the groove of a vinyl record looks like under a scanning electron microscope is still one for the coolest “camera tricks” we’ve ever seen pulled off. But watching the vascular system of a plant function is the recipe for one of those ah-ha educational moments, so we hope that 7th-grade biology teachers everywhere will find their way to this video.

The apparatus is described in great detail, but regular Hackaday readers will most likely want to focus in on the teardown of the X-ray panel, which [Ben] describes as a giant digital camera sensor tuned for receiving the X-rays. The source is a 50 kV 1 mA tube that he compares to what is used at the dental office. (Obviously this requires forethought to ensure his automated time-lapse setup will fail safe with the X-ray tube.) A Cyclone III FPGA drives the panel, communicating with the sensor array via two Ethernet interfaces.

A friend sent a the broken panel to [Ben] and he was able to easily repair a MOSFET that got knocked out of place. [biluni] shows up in the comments of this video, sharing his recollection from working in the industry 15 years ago that a panel like this would have cost $150k! But considering the stellar resolution, and repeatable use, it sure as heck beats the old film process.

Continue reading “Observing A Plant’s Vascular System With X-Ray Video”

Live Jam Kit Helps Electronic Musicians Stay In Sync

Jamming live with synths and drum machines can be fun, but for [Christian], there was a little something missing. He was looking for a way to keep everyone in the group on the beat and rocking out, and decided to build something to help.

The ethos of the build was to put one person ultimately in charge of the mix using Ableton. This stops the volume race, as each musician turns their own volume up and the jam devolves into a noisy mess. Each musician also gets a sync button they can hit if their instrument has drifted out of time. Everyone in the jam also gets their own monitor signal in their headphones, as well as a looper as well.

Individual players in the electronic jam can whip up a cool little loop, and spit it out to the main controller running Ableton using the looper. Then, they can mix up something else in their headphones without disrupting the main mix, before spitting it out as a loop again.

[Christian]’s demo video does a great job of showing how it all works. We particularly like the sync button, which gets rid of the usual frustrations when a sequencer in the jam trips over the tempo signal.

It’s all built with a Teensy, and seems like a great way to organize a jam with a bunch of different synths and drum machines. We’d certainly love to join in the fun.

We’ve seen other fun jam kits too, like this neat networked solution. Video after the break.

Continue reading “Live Jam Kit Helps Electronic Musicians Stay In Sync”