LED Hacks

1843 Articles

Twitter Notifier Lets Us Know How Awesome We Are

June 22, 2011 by 14 Comments

twitter_notifier

Let’s admit it, you’re just a little bit vain. Heck, we’re all just a little bit vain when you really think about it. Instructables user [pdxnat] was self-absorbed enough that he constructed an LED “mood light” that alerts him each time someone mentions his user name on Twitter.

The build is pretty simple, with most of the work being done on his PC. His Arduino is wired to a simple RGB LED that calmly cycles through various colors until someone mentions his name on Twitter. At that point, the client software running on his PC passes a message to the Arduino over a serial interface, causing it to wildly pulse the LED. Once it catches his eye, he stops the alert cycle with the press of the reset button, returning the LED to its previous state. As a bonus, he decided to write the Twitter-polling application in both Processing and Python, enabling fans of either language to easily replicate his work.

It’s a pretty cool idea, and it would be great to see someone expand it to include other online services to provide a greater overall feel for how awesome they really are.

Keep reading to see a quick video of the notifier in action.

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Turning Spotlights Into Soft LED Nightlights

June 20, 2011 by 7 Comments

led_spotlight_retrofit

[Bob] had a couple of bright, 12V halogen spotlights in his hallway that didn’t get much use. Rather than toss them out or leave them sitting idle, he decided to replace the bright bulbs with dimmer LEDs that he could keep lit through the night.

He opened up the spotlights, removing the bulbs and the built in mirrors before fitting them with 350mA LED pucks. The pucks were mounted to a pair of L-shaped aluminum scraps, which serve as both a mounting plate and heatsink. When running, the underdriven LEDs barely heat the aluminum plates, so he is pretty confident that the lights are adequately cooled.

The orange LEDs provide a nice warm glow in his hallway, and he says they are perfect for late night trips to the fridge. They currently stay lit all the time, but [Bob] is considering adding a light sensor to turn them on them automatically, as well as a PIR sensor to increase the brightness as someone passes by.

Disco Isn’t Dead: Diy Dance Floor Spotted At Student Parties

June 18, 2011 by 16 Comments

Your party is lame if it doesn’t include interactive blinking lights on the dance floor. [Mario] and [Lukas] didn’t want to have lame parties, so they enlisted some fellow students to build an interactive dance floor (translated). The finished party-piece is 4 meters by 2.5 meters (that’s about 13’x8′ for us yanks) and includes 160 lighted squares. But it’s the electronics that really make this a heavy project.

Milled into the underside of the pressboard base are a series of pockets and channels to hold various components. If you look hard enough, you’re going to find eight AVR microcontrollers which control the LEDs, 8 CPLDs to manage the weight sensors which make the floor interactive, and an FPGA and embedded computer to tie everything together. It’s movable, a hit at parties, and so far it seems to hold up to the occasional spilled beverage.

You can’t share a project like this without some video. See it after the break.

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Hacking Cakes With LEDs, The Sequel!

June 12, 2011 by 27 Comments

A few weeks back we ran a piece about the convergence of making and baking in an attempt to create a cake festooned with working LEDs. The moral was that not every creative idea ends in victory, but we applauded the spirit it takes to post one’s goofs for the whole internet to see and to learn from.

[Craig]’s LED matrix proved unreliable…and the underlying cake didn’t fare much better, resembling that charred lump in the toaster oven in Time Bandits. The cakes-with-lights meme might have died right there if not for a fluke of association…

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Rescuing Surplus Blinkenlights

June 12, 2011 by 18 Comments

Because surplus LED panels from an early 1990s supercomputer is a completely reasonable thing to own, [William Dillon] set to work displaying them on his wall.

The LED panels came from a surplus CM-5 Connection Machine, best known from it’s role as the mainframe in Jurassic Park (only an empty case with LED panels were used in the movie). When not on Isla Nublar, the Connection Machine was a fabulous piece of engineering from the 1980s Artificial Intelligence revival. With some machines having 65,536 processors, it was used for AI research using Lisp (although we were never very good at Lisp.

[William] built a wooden frame out of 1×2 inch maple and installed an X10 module behind the panels as a remote switch. The panels themselves aren’t controlled by a computer, so the only thing left to do was to mount the power supplies. It’s impressive to see the massively over-engineered power supplies that were designed to source 5V @ 30A when the panels only draw 7 Amps. [William] says it was a design feature of the Connection Machine to spare no expense.

[William]’s next plan is to reverse engineer the panels to display custom messages, and we can’t wait to see what he comes up with. We can’t explain why, but we really want to build one of these panels. Check out the pictures of [William] decommissioning the CM-5.

LiveLight Is An Expertly Crafted Ambilight Clone

June 5, 2011 by 30 Comments

[SunWind] (Edit 2018: who now goes as [nerdaxic]) developed his own version of the Phillips Ambilight system which he is calling LiveLight. We’ve seen more than a few of these hacks, many of them are based around Arduino, and most use LED strip lighting. [Nerdaxic] is using strip lighting as well, but his design is clean and polished quite a bit more than anything else we’ve seen. In our minds this would be welcomed by even the most discriminating of A/V enthusiasts.

He found just the right size of project box and managed to fit everything in on a nicely milled PCB. The enclosure itself has also been milled to allow the mini USB B connectors for each of the nine RGB LED strips. But he didn’t stop there, the top of the enclosure has labels milled into it to help when hooking everything up.

An ATmega32 addresses the LED strips based on data pushed in from a computer. An on-board FTDI chip adds USB connectivity and [nerdaxic] used a hack to rewrite the EEPROM on that chip so that it enumerates with the name “LiveLight USB Interface”. A program called Boblight gathers the data from the currently playing video. You can see the final project in the video embedded after the break.

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[Jeri’s] Dress Lights Up When Someone Invades Her Personal Space — Step Back Nerds!

June 1, 2011 by 34 Comments

[Jeri] threw down the geeky fashion gauntlet by building this LED enhanced dress. She chose to assemble the project for her trip to BarBot 2011, and we can’t think of a more appropriate setting for such a garment. It uses a motion sensor to set off a delayed pattern of blue lights hidden underneath the fabric.The best part of the hack is the instamatic camera. It looks like a fashion accessory, but it’s really hiding all of the circuitry for the lights.

Inside the camera a PIR sensor waits until it detects motion, sending a signal through an op-amp to the trigger circuitry. A 74LS14 Schmitt Trigger chip teams up with some resistor-capacitor timer circuits to build a delay chain for the LEDs. This way, after motion is detected the LEDs come on and off in a staggered pattern that doesn’t require a microcontroller and is very pleasing to the eye. See the Analog win for yourself after the break.

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