[Trent] is one of those guys who can make things happen. A friend of his gifted him a mannequin derriere simply because he knew [Trent] would do something fun with it. “Something fun” turned out to be sound reactive LED butt. At first blush, this sounds like just another light organ. This butt has a few tricks up its …. sleeve which warrant a closer look. The light comes from some off the shelf 5050 style RGB LED strip. The controller is [Trent’s] own design. He started with the ever popular MSGEQ7 7 Band Graphic Equalizer Display Filter, a chip we’ve seen before. The MSGEQ7 performs all the band filtering and outputs 7 analog levels corresponding to the amplitude of the input signal in that band. The outputs are fed into an ATTiny84, which drives the RGB strip through transistors.
The ATTiny84 isn’t just running a PWM loop. At startup, it takes 10 samples from each frequency band. The 10 samples are then averaged, and used to create a noise filter. The noise filter helps to remove any ambient sound or distortions created by the microphone. Each band is then averaged and peak detected. The difference between the peak and the noise is the dynamic range for that band. The ATTiny84 remaps each analog sample to be an 8 bit value fitting within that dynamic range. The last step is to translate the remapped signal values through a gamma lookup table. The gamma table was created to make the bright and dark colors stand out even more. [Trent] says the net result is that snare and kick drum sounds really pop compared to the rest of the music.
Without making this lamp the butt of too many jokes, we’d like to say we love what [Trent] has done. It’s definitely the last word in sound reactive lamps. Click through to see [Trent’s] PCB, and the Butt Lamp in action.
Continue reading “The Butt Lamp: Light From Where the Sun Don’t Shine”
Don’t let the above picture’s lack of blinking colors fool you, the light-up dress [Sam] fashioned for his girlfriend is rather eye-catching; we’d just rather talk about it than edit the gifs he’s provided. [Sam’s] been a busy guy. His last project was a Raspberry Pi digital photo frame, which we featured just over a week ago, but wearable hacks allow him to combine his favored hobbies of sewing and electronics.
If you’re looking to get started with wearable electronics, then this project provides a great entry point. The bulk of the build is what you’d expect: some individually-addressable RGB LEDs, the ever-popular FLORA board from Adafruit, and a simple battery holder. [Sam] decided to only use around 40 of the LEDs, but the strips come 60 to a meter, so he simply tucked the extra away inside the dress and set his desired limits in the software, which will allow him to preserve the entire strip for future projects. If you’ve ever attempted a wearable hack, you’re probably familiar with how delicate the connections can be and how easily the slightest bend in the wiring can leave you stranded. Most opt for a conductive thread solution, but [Sam] tried something different and used 30 AWG wire, which was thin enough to be sewn into the fabric. As an added bonus, the 30 AWG wire is insulated, which permits him to run the wires close to (or perhaps over) each other while avoiding shorts. [Sam’s] guide is detailed and approachable, so head over to his project page if you think you’ve caught wearables fever, and check out his GitHub for the source code.
RGB LEDs are awesome – especially the new, fancy ones with the WS2812 RGB LED driver. These LEDs can be individually controlled to display red, green, and blue, but interfacing them with a microcontroller or computer presents a problem: microcontrollers generally don’t have a whole lot of RAM to store an image, and devices with enough memory to do something really cool with these LEDs don’t have a real-time operating system or the ability to do the very precise timing these LEDs require. [Sprite_tm] thought about this problem and came up with a great solution for controlling a whole lot of these WS2812 LEDs.
[Sprite] figured there was one device on the current lot of ARM/Linux boards that provides the extremely precise timing required to drive a large array of WS2812 LEDs: the video interface. Even though the video interface on these boards is digital, it’s possible to turn the 16-bit LCD interface on an oLinuXino Nano into something that simply spits out digital values very fast with a consistent timing. Just what a huge array of RGB pixels needs.
Using a Linux board to drive RGB pixels using the video output meant [Sprite_tm] needed video output. He’s running the latest Linux kernel, so he didn’t have the drivers to enable the video hardware. Not a problem for [Sprite], as he can just add a few files to define the 16-bit LCD interface and add the proper display mode.
[Sprite_tm] already taken an oscilloscope to his board while simulating 16 strips of 600 LEDs, and was able to get a frame rate of 30 fps. That’s nearly 10,000 LEDs controlled by a single €22/$30USD board.
Now the only obstacle for building a huge LED display is actually buying the RGB LED strips. A little back-of-the-envelope math tells us a 640×480 display would be about $50,000 in LEDs alone. Anyone know where we can get these LED strips cheap?
Continue reading “Controlling Ten Thousand RGB LEDs”
[Roballoba] decided to combine his love for RC planes, things that light up, and photography, and we’re glad he did. He shares his method in this Instructable for illuminating a bare styrofoam replacement fuselage for a Parkzone Stryker RC plane. There are many more amazing pictures there as well.
He used low-tack tape to lay out the LED strips on the fuselage, solder the connections, and test them. Once he was satisfied with the arrangment, he flipped the strips face down so the foam diffuses the light. The lights are powered by a 12V Li-Po battery he soldered to a deans connector. Finally, [Roballoba] covered and heat sealed everything with Doculam, a very cost-effective laminate that offers great protection and security.
He used some LED corn lights as afterburners, which is a nice touch of realism. There is a video after the break where [Roballoba] shows us the connections up close and then runs through some light show options. Another video of a nighttime flight is waiting for you in the write up.
Spent too much money on eggnog and a new console this year to be able to replicate this build? $30 will snag what you need for this smartphone-controlled paper plane we featured a few weeks back. You could always BeDazzle it.
Continue reading “UFO-looking RGB LED RC Plane Lights Up the Night, Uses All the Acronyms”
[Sisam] and [Mclien] are a father and son team that built this sculptural room with an organic looking built-in seating area and sculpted lamp shades. When you have a room that looks this cool, the only option you have is to fill it with RGB LEDs, and it just so happens their light controller has a great Hackaday Easter egg.
The room lighting is provided by a Shifty VU shield, OctoBar LED controller, and a few of these RGB LED modules. All pretty standard for an RGB LED project, but where this contest submission really shines is the controller for all the room lights. It has three sliders for the red, green, and blue channels, beefy toggle switches for each light location, an LCD for showing the program mode, a rotary switch, and push buttons for cycling through stored setups.
The Easter egg for this project comes into play whenever the color value of the lights is set to Hackaday green, #00c100. When that happens, the Hackaday URL is displayed on the controller’s display.
Awesome work, and a really cool-looking room. We wouldn’t mind a tutorial on how you sculpted it, [Sisam].
This is an entry in the Fubarino Contest for a chance at one of the 20 Fubarino SD boards which Microchip has put up as prizes!
If infinity mirrors aren’t cool enough, the 10-foot-tall infinity portal should blow you away. Strictly speaking, the mirror itself is only 7’x4′, but you’ll still find yourself engulfed in the archway. The portal began as a simple prototype that we covered earlier this summer, which was just a frame of 2×4’s, some acrylic and LED strips. It works by putting lights between a two-way mirror and another mirror, reflecting most light internally and creating the illusion of depth.
The giant archway also began as a small-scale prototype, its shape and engravings carved out by a laser cutter. Once they were satisfied with its design, it was time to scale things up. The full-sized portal needed a a tremendous amount of stability, so the guys at Freeside built the base from wooden palettes. They needed the portal to travel to a few different venues, so the rest of the frame breaks down into components, including a removable wooden frame from which the acrylic hangs. A Teensy 3.0 runs all the WS2812 LED strips, which were chosen because each of their LEDs is individually addressable.
Check out the video below for an extremely detailed build log, which should give you a better idea of how massive and impressive this portal really is!
Continue reading “Freeside’s Infinity Portal”
[Edward] wanted a different way to modulate notes on his MIDI controller, so he decided to go touchless. Inspired by the pressure-sensing modulation on his Edirol keyboard, [Edward] aligned eight sensors into a row of playable notes and used infrared to sense the distance of a player’s hand from the keys. He also included some function buttons to cycle through 10 octaves and RGB LEDs beneath the table that perform alongside the music.
He chose SHARP GP2D120 sensors (direct link to datasheet) for their low threshold, which allowed the board to detect distance close to the sensor. Each is mounted onto a sheet of frosted acrylic along with its own “hold note” button and an LED to indicate the key is playing. The lower panel houses an Arduino Mega that drives the system along with an RGB LED strip and its driver board. [Edward] used Maxuino and OSC-Route to interface the Mega to a Max/MSP patch which runs the show.
Learn more about the FlightDeck’s features in a video demonstration of the controller and the software after the break, then check out some other MIDI hacks like this organ pedal or the Arduino-driven MIDI sequencer.
Continue reading “FlightDeck: A “Touchless” MIDI Controller”