To build any sort of autonomous vehicle, you need a controller. This has to handle all sorts of jobs – reading sensor outputs, controlling motors and actuators, managing power sources – controlling a vehicle of even moderate complexity requires significant resources. Modern cars are a great example of this – even non-autonomous vehicles can have separate computers to control the engine, interior electronics, and safety systems. In this vein, [E.N. Hering] is developing a modular autonomous vehicle controller, known as YAUVC.
The acronym stands for Yet Another Unmanned Vehicle Controller, though its former name – Fly Hard With A Vengeance – was not without its charms. The project is built around the concept of modularity and redundancy. The controller, designed primarily for flying vehicles, has an ATMega328P as its primary processor, into which various modules can be plugged in to handle different tasks.
This design choice has several benefits – having separate processors to handle individual jobs can make sense in real-time systems. You’d hardly want your quadcopter to crash because the battery management routines were stealing CPU time from the flight dynamics calculations. Instead, by offloading tasks to individual modules, each can run without interfering with the others. Modularity does come with drawbacks however — the problem of maintaining efficient communication between modules is one of them. [Hering] also plans to make sure the system can be set up to use multiples of the same module for redundancy – similar to modern flight systems in passenger aircraft that weigh the results of several computers to make decisions.
Much work has already been done – with the YAUVC platform already fleshed out with a backbone design as well as modules for WiFi, accelerometers and GPS navigation. We look forward to seeing YAUVC reaching flight-ready status soon!
When operating any kind of hydroponic farming, there are a number of lighting solutions — few of them inexpensive. Originally looking for an alternative to the lighting of IKEA’s expensive hydroponics system, [Professor Fartsparkle] and their colleague prototyped a rail system that allows clip-on LED boards for variable lighting options.
Taking inspiration from wire and track lighting systems, the key was the 5mm fuse holders mounted on the bottom of the LED boards. Snipping off their stopping clip makes them easy to install and remove from the mounting rails. The rails themselves double as power conduits for the LED boards, but keeping them out of the way is easily done with the variety of 3D printed hangers [Professor Fartsparkle] has devised. Lighting is controlled by a potentiometer on the power injection board, as well as any home automation control via an ESP8266.
[Professor Fartsparkle] asserts that the boards can be slid along the rails without any noticeable flickering, but they do suffer from heat dissipation issues. That aside, the prototype works well enough that the 3W LEDs can be run at half power.
This is an ingenious — and cheap — workaround for when sunlight isn’t an option, but you are still looking for a solution capable of automation.
It sounds a little like a Theremin and looks a lot like the contents of your scrap bin. But it’s a unique musical instrument called a modulin, and after a few teasers we finally have some details on how it was built.
Making music with marbles is how we first heard of [Martin] of the Swedish music group Wintergatan. He seems as passionate about making his own instruments as he is about the music itself, and we like that. The last time we saw one of his builds was this concert-ready music box, which he accompanied with an instrument he called a modulin. That video gave only a tantalizing look at this hacked together instrument, but the video below details it.
“Modulin” comes from the modular synthesizer units that create the waveforms and pressure-sensitive ribbon controller on the violin-like neck. The instrument has 10 Doepfer synthesizer modules mounted to a hacked-together frame of wood and connected by a forest of patch cables. [Martin]’s tour of the instrument is a good primer on how synthesizers synthesize – VCOs, VCAs, envelope generators, filters – it’s all there. We’re treated to a sample of the sounds a synthesizer can make, plus majestic and appropriately sci-fi sounding versions of Also sprach Zarathustra and the theme from Jurassic Park. And be sure to check out the other video for another possibly familiar tune.
This might be old hat to musicians, but for those of us to whom music is a mystery, such builds hold extra sway. Not only is [Martin] making music, he’s making the means to make music. We’re looking forward to hearing what’s next.
Continue reading “It’s a Synthesizer. It’s a Violin. It’s a Modulin”
Ever since Jimi Hendrix brought guitar distortion to the forefront of rock and roll, pedals to control the distortion have been a standard piece of equipment for almost every guitarist. Now, there are individual analog pedals for each effect or even digital pedals that have banks of effects programmed in. Distortion is just one of many effects, and if you’ve built your own set of pedals for each of these, you might end up with something like [Brian]: a modular guitar pedal rack.
Taking inspiration from modular synthesizers, [Brian] built a rack out of wood to house the pedal modules. The rack uses 16U rack rails as a standard, with 3U Eurorack brackets. It looks like there’s space for 16 custom-built effects pedals to fit into the rack, and [Brian] can switch them out at will with a foot switch. Everything is tied together with MIDI and is programmed in Helix. The end result looks very polished, and helped [Brian] eliminate his rat’s nest of cables that was lying around before he built his effects rack.
MIDI is an extremely useful protocol for musicians and, despite being around since the ’80s, doesn’t show any signs of slowing down. If you want to get into it yourself, there are all kinds of ways that you can explore the studio space, even if you play an instrument that doesn’t typically use MIDI.
A lot of work with binary arithmetic was pioneered in the mid-1800s. Boolean algebra was developed by George Boole, but a less obvious binary invention was created at this time: the Braille writing system. Using a system of raised dots (essentially 1s and 0s), visually impaired people have been able to read using their sense of touch. In the modern age of fast information, however, it’s a little more difficult. A number of people have been working on refreshable Braille displays, including [Madaeon] who has created a modular refreshable Braille display.
The idea is to recreate the Braille cell with a set of tiny solenoids. The cell is a set of dots, each of which can be raised or lowered in a particular arrangement to represent a letter or other symbol. With a set of solenoids, this can be accomplished rather rapidly. [Madaeon] has already prototyped these miniscule controllable dots using the latest 3D printing and laser cutting methods and is about ready to put together his first full Braille character.
While this isn’t quite ready for a full-scale display yet, the fundamentals look like a solid foundation for building one. This is all hot on the heels of perhaps the most civilized patent disagreement in history regarding a Braille display that’s similar. Hopefully all the discussion and hacking of Braille displays will bring the cost down enough that anyone who needs one will easily be able to obtain and use one.
Continue reading “Hackaday Prize Entry: Modular, Low Cost Braille Display”
Cellphone startup Fairphone is now taking pre-orders for their modular smartphone, which is expected to start shipping in December of this year. Although I’m much more familiar with Google’s project Ara, this is the first modular concept to make it to market. It does lead me to a few questions though: is this actually a modular smartphone, and how widely will modular concepts be adopted?
Continue reading “The Key to Modular Smartphones”
There is a big community of people creating all kinds of synthesizers, but until now no one has attempted to make a keyboard controller like the one [Tim] created. Not only has he created the keyboard synthesizer, but he’s developed one that is modular and 3D printed so you can just expand on the synth you have rather than go out and buy or build a new one.
The design has a lot useful features. Since the design is modular, you can 3D print extra octaves of keys if you need, and simply build off of the existing keyboard. The interior has mounts that allow circuit boards to be screwed down, and the exterior has plenty of available places to put knobs or sliders. Anything that could possibly be built into a synthesizer is possible with this system, and if you decide you want to start small, that’s possible too!
All of the design files are available from Pinshape if you want to get started. The great thing about this controller is that you could use a 555-based synth in this keyboard controller, or a SID synth, or any other synth you could think of!