Numato Opsis: FPGA-based Open Video Platform

October 2, 2015 by Elliot Williams 49 Comments

Imagine that you’re running a conference and you want to do a professional job recording the speakers and their decks. You’ll need to record one video stream from the presenter’s laptop, and it’d be nice to have another of the presenter taken with a camera. But you also need to have the presenter’s screen displayed on a projector or two for the live audience. And maybe you’d like all of this dumped down to your computer so that you can simultaneously archive the presentation and stream it out over the Internet.

That’s exactly the problem that the hdmi2usb project tries to solve on the software side for open-source software conventions. And to go with this software, [Tim Ansell] has built the Numato Opsis FPGA video board, to tie everything together. What’s great about the platform is that the hardware and the firmware are all open source too.

Because everything’s open and it’s got an FPGA on board doing the video processing, you’re basically free to do whatever you’d like with the content in transit, so it could serve as an FPGA video experimenter board. It also looks like they’re going to port code over so that the Opsis could replace the discontinued, but still open source, Milkimist One video effects platform.

One thing that’s really cute about the design is that it reports over USB as being a camera, so you can record the resulting video on any kind of computer without installing extra drivers. All in all, it’s an FPGA-video extravaganza with a bunch of open-source software support behind it. Very impressive, [Tim]!

Captain Disillusion To The Rescue

September 23, 2015 by George Graves 35 Comments

We all get those emails from well meaning friends and family members about some internet video that “you just have to watch – it’s unbelievable!” Facebook is full of such posts that get passed around more than a doobie at a Grateful Dead concert. If you’re like us, they often make you cringe a bit knowing that they are fake, but you just can’t put your finger on why, or how they did it. All you know is some fancy video trickery is involved.

Well, fear not! [Captain Disillusion] is here!!!! Although he doesn’t put out videos on a regular basis, when he does, we find them very entertaining and informative – we thought you might as well. Think of his Youtube channel like Mythbusters for those annoying viral videos. In his latest work, he debunks a video that was passed around several year back. The original video claimed you can take a cup that is upside down and full of water and it will remain in the shape of the cup – just by giving it a good spin as you lift up. We won’t ruin the surprise for you, but lets just say there was some computer magic involved.

We can’t help but to think his videos might be a great way to get kids (and perhaps some adults) into critical thinking, and not accepting everything they see on the internet at face value. If you like what you see, you can watch the full video after the break, or subscribe to his Youtube channel.

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DisplayPort With An FPGA

September 23, 2015 by Al Williams 32 Comments

One of the challenges with display technology is the huge increase in bandwidth that has occurred since LCD panels took over from Cathode Ray Tubes. Low end laptops have a million pixels, UHD (“4K”) displays
have 8 million and the latest Full Ultra HD (“8k”) displays have over 33 million pixels. Updating all those pixels takes a lot of bandwidth – to update a 4k display at 60 Hz refresh rates takes close to a gigabyte per second. 8 billion bits – that is a lot of bits! That’s why VGA ports and even DVI ports are starting to vanish in favor of standards like HDMI and DisplayPort.

The current release of HDMI is 2.0, and is tightly licensed with NDAs and licensing fees. VESA, who created the DisplayPort standard, states the standard is royalty-free to implement, but since January 2010, all new DisplayPort related standards issued by VESA are no longer available to non-members.

So after receiving a new Digilent Nexys Video FPGA development board, Hackaday regular [Hamster] purchased a UHD monitor, scoured the internet for an old DisplayPort 1.1 standard, and started hacking.

A couple of months and 10,000 lines of VHDL code later what may be the first working Open Source DisplayPort
implementation is available. The design includes a 16-bit scrambler, an 8b/10b encoder, and multichannel support.

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Retro Games On ArduinoCade Just Shouldn’t Be Possible

September 17, 2015 by Kevin Dady 26 Comments

Making retro video games on today’s micro controllers brings many challenges, especially when using only the micro controller itself to handle the entire experience. Complex graphics, sound, game logic and input is taxing enough on the small chips, toss in NTSC color graphics and you have a whole different bear on your hands.

[rossum] set out making the Arduinocade retro game system using an overclocked Arduino Uno, and not much more. Supporting 4 voice sound and IR game controllers, the system also boasts 27 simultaneous colors all in software. These colors and the resolution feel like they’re impossible without a graphics chip to offload some of the work. While doing all of this the ATmega328p is also playing some faithful reproductions of classic arcade games.

The uses a couple of interesting tricks. Color is generated with NTSC color artifacts, where the screen is really black and white, but thanks to a delay or two in the signal generation the bits are out of phase from the reference “color burst” signal and appear on-screen as unique colors. This approach was used in the 8 bit Apple II personal computers to generate its colors, and also on the early IBM PC’s with CGA cards to drastically increase color depth. In this case, the chip is overclocked with a 28.6363 MHz crystal (a multiple of NTSC timing) and the SPI hardware leveraged to shift out all the necessary pixels. Check out how great it looks and sounds after the break.

It’s good to see an old trick on a new project and we are off to play some games!

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Thermal Vision HUD Isn’t Only For Fighter-Jets!

September 15, 2015 by James Hobson 37 Comments

In case you weren’t aware, thermal vision units have seen huge price reductions lately. There’s a few on the market for under $300! While that might still seem expensive, remember, it’s thermal-freaking-vision. [Tim] bought a Seek Thermal as soon as it was available, and just recently finished his first project with it — giving his car a thermal HUD for driving at night.

The Seek Thermal is a small thermal imaging unit that has a micro USB attachment for phones. Simply plug it in, and your phone becomes the preview window. But for mounting on your car, you can’t have it behind a window, because most glass is not transparent to heat wavelengths, so [Tim] had to get creative.

He designed and 3D printed a magnetic mount for it to sit on the hood of his car. But in the case any debris from the road hit it, he wanted to protect the lens. So he started looking up thermally transparent materials — turns out they’re really expensive.

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Video FPGA With No External A/D

September 9, 2015 by Al Williams 23 Comments

You have an old PC with a nonstandard RGB video out and you need to bring it to a modern PAL TV set. That’s the problem [svofski] had, so he decided to use an Altera-based DE1 board to do the conversion. Normally, you’d expect reading an RGB video signal would take an analog to digital converter, which is not typically present on an FPGA. Instead of adding an external device, [svofski] used a trick to hijack the FPGA’s LVDS receivers and use them as comparators.

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Arduino Video Over 2 Wires For Under $50: Mesa-Video

September 1, 2015 by Richard Baguley 60 Comments

If you want video support on your project, you might start from a device like a Raspberry Pi that comes with it built in. [Kevinhub88] doesn’t accept such compromises, so he and his Black Mesa Labs have come up with a whole new way to add video support to devices like the Arduino and other cheap controllers. This project is called Mesa-Video, and it can add digital video at a resolution of up to 800 by 600 pixels to any device that has a single serial output.

The video is created by an FT813, a low cost GPU from FTDI that offers a surprising amount of video oomph from a cheap, low power chip ~~(he has demoed it running from a lemon battery)~~, meaning that he is hoping to be able to sell the Mesa-Video for under $50.

UPDATE: [KevinHub88] let us know that he didn’t actually power the device from a lemon battery, as you would need a lot of lemons to make 50mA at 5V. Apologies for any confusion!

However, Mesa-Video is just the beginning. [Kevinhub88] wanted to get around the problem of stacking shields on Arduinos: add more than one and you get problems. He wanted to create an interface that would be simpler, faster and more open, so he created the Mesa-Bus. This effectively wraps SPI and I2C traffic together over a simple, fast serial connection that doesn’t require much decoding. This means that you can send power and bi-directional data over a handful of wires, and still connect multiple devices at once, swapping them out as required. You could, for instance, do your development work on a PC talking to the prototype devices over Mesa-Bus, them swap the PC out for an Arduino when you have got the first version working in your dev environment. Is the Arduino not cutting it? Because Mesa-Bus is cross-platform and open source, it is easy to swap the Arduino for a Raspberry Pi without having to change your other devices. And, because all the data is going over a simple serial connection in plain text, it is easy to debug.

It’s an ambitious project, and [Kevinhub88] has a way to go: he is currently working on getting his first prototype Mesa-Bus devices up and running, and finalizing the design of the Mesa-Video. But it is an impressive start and we’ll be keeping a close eye on this work. Hopefully he can avoid that head crab problem as well because those things are as itchy as hell.