Modular Drum Machine Creates Random Rhythms

Don’t worry, the rhythms themselves aren’t random! That would hardly make for a useful drum machine. [kbob]’s creation does have the ability to randomly generate functional rhythms, though, and it’s all done on a breadboard.

The core of this tiny drum machine is two Teensy dev boards. One is an FM synth tuned to sound like drums, and the other is a random rhythm generator with several controls. The algorithms are from Mutable Instruments’ open source Eurorack modules. The entire thing fits on a breadboard with JIGMOD modules for the user interface. The machine runs on lithium batteries in the form of USB cell phone chargers. The battery holders were designed in Fusion 360 and 3D printed.

The function of the drum machine is pretty interesting as well. There are a set of triggers tied to the buttons on the machine. When a button is pressed, the drum machine plays that sound at the appropriate time, ensuring there are no offbeat beats. The potentiometers are polled once every millisecond and the program updates the output as required. There’s also a “grid” of rhythms that are controlled with two other knobs (one to map the X coordinate and the other for the Y) and a “chaos” button which adds an element of randomness to this mapping.

The modular nature of this project would make this a great instrument to add to one’s musical repertoire.It’s easily customizable, and could fit in with any of a number of other synthesizer instruments.

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Paper Tape Drive for a Live Performance Music Box

Music is a mystery to some of us. Sure, we know what we like when we hear it, but the idea of actually being able to make it baffles us. And the idea of being able to build new instruments to create it, like this paper-tape programmable music box (YouTube, embedded below), is beyond impressive.

You’ll no doubt remember [Martin Molin] of the group “Wintergatan” and his astounding marble madness music machine. This instrument is on a much more modest scale and is centered around an off-the-shelf paper tape music box. But the cheap plastic drive gears kept failing under performance conditions, so [Martin] headed to what appears to be his cave-based workshop and started grinding. He prototyped a new paper drive from Lego Technics, and while it worked, it needed help to pull the paper. What followed was an iterative design process that culminated in a hybrid of plastic and metal Technic parts that drive the paper reliably, and a musical instrument that’s much more than just a tinny wind-up music box. Hear it in action below with another new instrument, the Modulin, which sounds a little like a Theremin but looks like – ah, just watch the video.

The build video hints at more details to come, and we’re hoping for a complete series like that for the marble machine. We’d also love to see details on the Modulin too – if there ever was a hacked musical instrument, that’s it.

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Niklas Roy’s Music Construction Machine

If you think of a music box, the first image that might come to mind is that of a small tabletop device with a simple mechanism and a single instrument. Usually a row of chimes triggered by points etched on a roller. If you are a bit more ambitious maybe you thought of a player piano with a roll of perforated paper carrying a tune, but yet again with only the single voice of one instrument.

mcm_06[Niklas Roy] however has a different vision when it comes to mechanical music. He’s created an entire ensemble with real musical instruments, a drum kit, keyboard, and electric guitar. His Music Construction Machine is no simple music box with a single tune though, it generates a constantly changing melody through a mechanically implemented algorithm with a complex interaction of cyclic variables that periodically alternate between harmonic and discordant. Unfortunately we can’t find any audio examples of the installation at work.

There is a timeliness to this post, the machine is part of an art installation at the Goethe-Institut Pop Up Pavillion on the Nowy Targ square in Wrocław, Poland, and it will be exhibited until the 10th of July. We hope some of our Central European readers will be within range and can make the trip. If you do, we’d love to hear some sample audio from your visit.

We’ve featured [Niklas]’s work many times before here at Hackaday. Just a few highlights are a past musical project powered by water, God on the CB radio, and his all-terrain mobile beer crate.

UPDATE: [Niklas] has posted details of the exhibition in Wroclaw on his blog, including several videos like the on below the break that show the machine in its full glory.

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Autonomous Musical Soundscapes from 42 Fans and 7 Lasers

[dmitry] writes in to let us know about a new project that combines lasers with fans and turns the resulting modulation of the light beams into an autonomous soundscape. The piece is called “divider” and is a large, wall-mounted set of rails upon which seven red lasers are mounted on one end with seven matching light sensors mounted on the other end. Interrupting the lasers’ paths are forty-two brushless fans. Four Arduino Megas control the unit.

3Laser beams shining into light sensors don’t do much of anything on their own, but when spinning fan blades interrupt each laser beam it modulates the solid beams and turns the readings of the sensors on the far end into a changing electrical signal which can be played as sound. Light being modulated by fan blades to create sound is the operating principle behind a Fan Synth, which we’ve discussed before as being a kind of siren (or you can go direct to that article’s fan synth demo video to hear what kind of sounds are possible from such a system.)

This project takes this entire concept of a fan synth further by not only increasing the number of lasers and fans, but by tying it all together into an autonomous system. The lasers are interrupted repeatedly and constantly, but never simultaneously. Listen to and watch it in action in the video below.

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Life-Size Vu Meter Gets the Party Started

There’s nothing better than making a giant version of one of your hacks. That is, other than making it giant and interactive. That’s just what [Est] has done with his interactive VU meter that lights up the party.

The giant VU meter boasts a series of IR detectors that change the colors and modes of the meter based on where the user places their hands. The sensors measure how much light is reflected back to them, which essentially function as a cheap range finder. The normal operation of the meter and the new interactivity is controlled by a PIC16F883 and all of the parts were built using a home-made CNC router. There are two addressable RGB LEDs for each level and in the base there are four 3 W RGB LEDS. At 25 levels, this is an impressive amount of light.

[Est]’s smaller version of the VU meter has been featured here before, if you’re looking to enhance your music-listening or party-going experiences with something a little less intimidating. We’ve also seen VU meters built directly into the speakers and also into prom dresses.

Retrotechtacular: Examining Music in 1950’s Russia

If you had told 12-year-old me that one day I would be able to listen to pretty much any song I wanted to on demand and also pull up the lyrics as fast as I could type the artist’s name and part of the title into a text box, I would have a) really hoped you weren’t kidding and b) would have wanted to grow up even faster than I already did.

The availability of music today, especially in any place with first world Internet access is really kind of astounding. While the technology to make this possible has come about only recently, the freedom of music listening has been fairly wide open in the US. The closest we’ve come to governmental censorship is the parental advisory sticker, and those are just warnings. The only thing that really stands between kids’ ears and the music they want to listen to is parental awareness and/or consent.

However, the landscape of musical freedom and discovery has been quite different in other corners of the world, especially during the early years of rock ‘n roll. While American teens roller skated and sock-hopped to the new and feverish sounds of Little Richard and Elvis Presley, the kids in Soviet Russia were stuck in a kind of sonic isolation. Stalin’s government had a choke hold on the influx of culture and greatly restricted the music that went out over the airwaves. They viewed Western and other music as a threat, and considered the musicians to be enemies of the USSR.

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Digital Wind Chimes

Quality wind chimes are not cheap. No matter how much you spend, though, they generally sound the same year after year. If that bothers you, maybe [sensatroniclab] can help. They’ve posted a simple design for a digital wind chime using the Ototo music generator.

The Ototo is reasonably priced and promises to let you make music from anything (well, anything conductive, anyway).  Because the Ototo handles all the music production, the only real building part of the project is the wind sensors. The sensors are made with conductive fabric with a marble at the end for weight.

In the video below you can see [Matthew Ward] talk about the device and actually play it like you might a harp. This would be a good school project owing to the simplicity of using the Ototo, although [sensatroniclab] is actually working on accessibility music projects.

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