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 I encourage the communication of constructive ideas on how to make FIRST a better program. - meaubry [more] |
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| I encourage the communication of constructive ideas on how to make FIRST a better program. - meaubry [more] |
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#1
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What happens when a bored EE gets ahold of 57,600 LEDs
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#3
05-07-2011, 17:49
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
youtube is erroring out on me so I can't comment so i'll post my questions here:
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#4
05-07-2011, 18:22
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
This is too cool. I'm starting to fear the day when we have to see people's facebook statuses displayed on their own clothing....
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#5
05-07-2011, 18:24
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
Can it me made waterproof? Or at least water resistant?
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#6
05-07-2011, 18:34
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
A few half answers: It uses all custom circuitry. I think he said it has a couple DSPs to process the video. The video input is just a normal yellow RCA jack for composite video. Resolution is 160x120. He said it gets warm..... It's powered by a few lithium battery packs, one plan is to install them in some shoes!
He's been working on this project for a few months. It's been fun watching the progress, and the design changes as he figured things out. The flex circuit boards are expensive, and that many LEDs are expensive.
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#7
05-07-2011, 22:21
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
What he said! It gets warm because it's a polyester lab coat with another layer of plastic insulation. The whole thing dissipates 100 W, which is about 20 milliwatts per square inch.
I wrote a bunch of VHDL code to convert digitized video to RGB pulse width modulation for the LEDs. It works just like the billboards, but thinner. I wouldn't mind spraying some conformal coating on it to make it water resistant. I'll have to ask my friend who works at an LED billboard company for recommended products.
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#8
05-07-2011, 22:24
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
Well, there is always quantity pricing. Based on my experience with LED lighting wall panels, they do get hot after a while. In addition, the scanning of the array produces horrendous RF near the panel. Keep mics away from the panel and the wiring.
A few years ago, I was walking the floor at a component exposition and turned the corner to face an LED manufacturer's display. I could feel the heat from about ten feet away. The display was all of their products mounted on a single panel about six foot high and two to three foot wide. I think it was ledtronix.
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#9
06-07-2011, 04:14
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
What size LEDs are being used? (I remember, about 5 years ago, there were SMT LEDs available in sizes as small as roughly 0.5 mm × 0.8 mm × 1.2 mm, or multicolour ones in 4.0 mm × 4.0 mm × 2.5 mm packages. I think Osram Sylvania was the manufacturer I'd used.)
I'm also pleasantly impressed by the fact that someone is putting all those Arduino-based units of clothing to shame.  (There are a few genuinely innovative ones, but for the most part, the novelty of a string of flashing lights in a jacket wore off a couple of years ago. Making it into a TV raises the bar.)
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#10
07-07-2011, 15:47
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
The LEDs are the standard 0603 size, 1.6mm x 0.8mm. They are made by Kingbright, and come on reels. I bought 22,000 of each of R,G and B types. Surprisingly, green costs twice as much as blue.
This display runs at much lower power than a typical LED billboard, since it's designed for use indoors or at night. Curiously, the idle current of the 1,000 driver chips (15mA at 3.3V) uses as much power as the LEDs themselves.
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#11
07-07-2011, 18:08
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
OMG that is awesome! Although the phrase "too much time on your hands" comes to mind...
Now to connect video cameras that show the scene 180 degrees from the LED, making an effective invisibility
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#12
07-07-2011, 19:02
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
Quote:
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#13
07-07-2011, 21:11
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
This is definitely one of the coolest things I have seen recently.
The Lampduino I am building pales in comparison. I have a measly 8x8 grid! Last edited by Bryan Herbst : 07-07-2011 at 21:13.
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#14
08-07-2011, 11:44
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
So.... I want to write something snarky about the suit Will-I-Am wore at the World Championship, but I'm fighting the urge.
Perhaps next year's championship's entertainment should feature Squirrel's brother?  Blake
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#15
11-07-2011, 23:01
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Re: What happens when a bored EE gets ahold of 57,600 LEDs
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