Because Burning Man Needed More LEDs

There are a lot of blinky glowy things at Burning Man every year, and [Mark] decided he would literally throw his hat into the ring. He built a high visibility top hat studded with more RGB LEDs than common sense would dictate. It’s a flashy hat, and a very good example of the fashion statement a few hundred LEDs can make.

[Mark]’s top hat has 481 WS2812b addressable LEDs studded around the perimeter, a common LED choice for bright and blinky wearables. These LEDs are driven by a Teensy 3.1, with a Bluetooth transceiver, a GPS module, a compass, and gyro/accelerometer attached to the microcontroller. That’s a lot of hardware, but it gives [Mark] the capability of having the hat react to its own orientation, point itself North, and allow for control via a modified Nintendo NES controller.

The WS2812 LEDs draw a lot of power, and for any wearable project having portable power is a chief concern. [Mark]’s original plan was to use an 8x battery holder for the electronics enclosure, and use five AA batteries to power the hat. The total idle draw of the LEDs was 4.5 Watts, and with even a few LEDs blinking colors there was a significant voltage drop. The idea of powering the hat with AA batteries was discarded and the power source was changed to a 195 Watt-hour lithium ion battery bank that was topped off each day with a solar panel.

The hat is awesome, exceedingly bright, and something that gets a lot of attention everywhere  it goes. For indoor use, it might be too bright, but this could be fixed with the addition of a bit of black stretchy fabric, like what our own [Mike Szczys] did for his DEF CON hat. [Mark]’s hat is just version 1, and he plans on making a second LED hat for next year.

Make Your Own Remote Control LED Light

Want to control the colors in your home? Sure, you could just buy a Philips Hue bulb, but where’s the hacking fun in that? [Dario] agrees: he has written a tutorial on building an Arduino-controlled RGB light system that plugs into a standard light socket.

[Dario] is using a bulb from Automethion in Italy, an Arduino, and an ESP8266 shield that sends signals to the bulb. The Arduino and shield are running the Souliss framework that provides smart home features and runs on a number of platforms, so it is a good open platform for creating your own smart home apps, and would be easy to expand. We have also seen a few other projects that use the ESP8266 to control an RGB strip, but this is the first one that uses a bulb that plugs into a standard light socket.

At the moment, Automethion is the only company selling this light, but I hope that others will sell similar products soon.

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Hackaday Links: August 16, 2015

[Matt] created an animated gif of New Horizon’s Pluto flyby. The source images were taken from the the raw LORRI images, modified so the background star field could be seen, and assembled with OpenCV. Because Pluto and Charon orbit each other around a point above Pluto’s surface, simply putting Pluto in the center of each frame wouldn’t work. It’s the best visual explanation of this weird arrangement yet, all brought to you by the magic of OpenCV and Python.

On the subject of Kickstarter creators that don’t understand the conservation of energy, I present this.

We don’t know exactly what’s going on with this one, but here’s a swimming pool covered with RGB LEDs. It’s controlled by two Rainbowduinos, and looks like the coolest disco floor you’ve ever seen.

[Frank]’s 2011 Hundai Santa Fe wasn’t cool enough, so he added an F16 flight stick to his shift knob. The choice of joystick is paramount here: Saitek joysticks look too techy, Logitech ones are too expensive, and the Warthog H.O.T.A.S costs $400. Joysticks are extremely niche peripherals these days, it seems. He ended up strapping an old F16 joystick from the 90s on his shift knob, and it looks close enough to the real thing.

Two bodgers are stuffing the engine from a Toyota Celica into a 1980 Mini, and they’re trying to make it look stock. We’ve seen their project before, and now there’s a new episode. In this episode: the pedal box, the steering wheel, and figuring out how to make the car drive straight.

Hackaday Prize Entry: 10 Watt Individually Addressable RGB LEDs

Individually addressable RGB LEDs like Neopixels, WS2812s, and  WS2811s are the defacto standard for making blinkey glowey projects. To build a very bright display, you need a lot of them, relegating very bright RGB displays to those of us who can afford the hardware and figure out how to drive that many LEDs. For his Hackaday Prize entry, [AJ Reynolds] is cranking these tiny RGB LEDs up a notch by building an individually addressable 10 Watt RGB floodlight.

Instead of building an RGB LED floodlight from scratch, [AJ] is leveraging the most mediocre of what China has to offer. He found 10 Watt RGBs for a dollar a piece and a few floodlight cases that cost about $5 a piece. By dispensing with the white LED in the floodlight case and replacing it with a 10 Watt RGB LED and some custom circuitry, [AJ] can build a powerful RGB floodlight with a BOM cost of under $15.

While there are big RGB floodlights out there, controlling them either means a custom proprietary protocol or messing around with DMX. A floodlight that speaks the same language as a WS2811 leverages an enormous amount of work from the world of Arduino and a lot of projects from around the Internet, making this a great entry for really bright blinkies and an excellent entry for The Hackaday Prize.

The 2015 Hackaday Prize is sponsored by:

Upgrading An Old Lantern

[Shockwaver] stumbled across some old kerosene lanterns, and decided he also stumbled across his next project. He decided to leave the kerosene out, and in its place used some RGB LEDs to bring the lanterns back to life. This is quite an upgrade. Considering the burning kerosene will only put out a few colors of light, the astute reader will have realized the RGB array has the ability put out over 16 million colors.

After some initial testing, he settled on a 24 LED circle array powered by an ATtiny85. The FastLED library helped him keep the code within the tight memory requirements. [Shockwaver] was not used to working with the such a small amount of memory, but after some fiddling he was able to make it work in the end, using 8,126 bytes.

The source can be found on his github page. Be sure to check out the video below to see the RGB lantern in action.

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Polar Coordinate Mapping And RGB LED Disks

Last week, Adafruit released the DotStar RGB LED Disk, a 240mm diameter disk packed with 255 individually addressable RGB LEDs. Because blinkey glowey projects are the best projects, [Adam] had to have one. His tests open up some interesting possibilities in the world of blinkey LED stuff, including a polar coordinate display that would be perfect for low-res games and LED clocks.

[Adam] found the Disk sufficiently bright and glowey, but there were two problems. The first was the JST SM connector on the input of the DotStar Disk; with 255 LEDs on the disk, it has a maximum draw of over 10A, while the connector can only supply 7A without getting unreasonably warm. Secondly, there aren’t 60 LEDs around the outer edge of the disk, limiting its application as a clock.

There’s another thing wrong with the DotStar Disk, until you realize it’s effectively a polar coordinate display. RGB LED libraries are usually written for strips or matrices, not circles. The LEDs are sequentially arranged on the DotStar disk spiraling inwards, and after mucking about with some terrible code, [Adam] realized he could control a pixel with only its distance from center and angle from the connector. This makes plotting circles easier, but it also opens this display up to some interesting applications; circular Pong would be cool, and LED clocks are the bees knees.

3D Printed Headgear Turns You into a Sim

Stop what you’re doing and dust off that 3D Printer, you’re going to want this headgear for your next party. [Daniel Harari] has created the perfect start of a phenomenal The Sims costume with this Bluetooth-enabled plumb bob.

The iconic crystalline shape will be familiar to anyone ever exposed to the game. It served as a handle and indicator for each virtual character in the popular life-simulation video game. On a short build deadline (a party), [Daniel] found a model of the shape he wanted on Thingiverse. He printed it in translucent green PLA so that LEDs inside would make it glow.

A headband and an aluminum pipe connect this to the wearer. Inside the printed enclosure is a an intricately packaged set of electronics that include an Arduino pro mini, low-side transistors to control six RGB LEDs, and an HC-05 Bluetooth module to connect to his phone. Batteries were mounted on the side of the pipe but we bet a bit of head scratching could re-imaging the battery type and get it inside the enclosure as well.

[Daniel] muses about adding brainwave sensing to control the LEDs. For this build he didn’t even need to write an app; he was able to get an already available color-picker to work. We’d like to see this combined with sentiment; a concept starting to gain popularity which samples social media and ascertains mood to change the display base what is found.

You realize what’s missing from his writeup? We couldn’t find any pictures of him wearing the thing!