Even if you’re reading this on a piece of paper that was hand-delivered to you in the Siberian wilderness, somewhere someone had to use energy to run a printer and also had to somehow get all of this information from the energy-consuming information superhighway. While we rely on the electric grid for a lot of our daily energy needs like these, it’s often unclear exactly how the energy from nuclear fuel rods, fossil fuels, or wind and solar gets turned into electrons that somehow get into the things that need those electrons. We covered a little bit about the history of the electric grid and how it came to be in the first of this series of posts, but how exactly does energy get delivered to us over the grid? Continue reading “Electrical Grid Demystified: How Energy Gets Where Its Needed”
The best gaming platform is a cloud server with a $4,000 dollar graphics card you can rent when you need it.
[Larry] has done this sort of thing before with Amazon’s EC2, but recently Microsoft has been offering a beta access to some of NVIDIA’s Tesla M60 graphics cards. As long as you have a fairly beefy connection that can support 30 Mbps of streaming data, you can play just about any imaginable game at 60fps on the ultimate settings.
It takes a bit of configuration magic and quite a few different utilities to get it all going, but in the end [Larry] is able to play Overwatch on max settings at a nice 60fps for $1.56 an hour. Considering that just buying the graphics card alone will set you back 2500 hours of play time, for the casual gamer, this is a great deal.
It’s interesting to see computers start to become a rentable resource. People have been attempting streaming computers for a while now, but this one is seriously impressive. With such a powerful graphics card you could use this for anything intensive, need a super high-powered video editing station for a day or two? A CAD station to make anyone jealous? Just pay a few dollars of cloud time and get to it!
This project is a wonderful example of what can be accomplished with a rather complicated logic circuit. It’s an Etch-a-Sketch made from a 16×16 LED grid. That in itself is only somewhat interesting. But when hearing about the features and that it is driven by logic chips we were unable to dream up how it was designed. There’s no schematic but the video commentary explains all.
The thing that confused us the most is that the cursor is shining brighter than the rest of the pixels. This is done with two different 555 times and a duty cycle trick. When you turn the trimpots the cursor position is tracked by some decade counters. Pixels in your path are written to a RAM chip which acts as the frame buffer. And there’s even a level conversion hack that let’s the display run at 15v to achieve the desired brightness. Top notch!
Continue reading “LED Etch-a-Sketch built without a microcontroller”
Careful, this hack might foster doubts about the level of fun you’re having at you own Computer Science department. Last weekend a group of students at MIT pulled off a hack of great scale by turning a building into a Tetris game board.
The structure in question is the Green Building on the Massachusetts Institute of Technology Campus. It houses the Earth, Atmospheric, and Planetary Sciences Departments, but was chose based on the size and regularity of the grid formed by the windows on one side. The group hasn’t provided much in the way of details yet, but the video after the break shows the game play and start-up screen. The middle portion of the building is used as a scrolling marquee to display the word “Tetris” before the game pieces start falling. We’re only guessing (and we hope you will add your conjecture in the comments section) but we’d bet they assembled a set of wireless RGB LED lamps and set one on the sill of each window. There does seem to be a number of ‘dead’ pixels, but it doesn’t diminish the fun of the overall effect.
If you don’t have your own building to play on, you should go small-scale and implement Tetris on a character display.
Drilling precise grids without a CNC machine can be tough to pull off. [Ookseer] has come up with a nifty method for dilling aligned holes with a drill press. He uses a right-angle jig on a Dremel drill press with stacks of business cards as spacers. The same number of cards is added between the substrate and the jig to space each new hole evenly. This method comes in handy when drilling grids in an enclosure for speakers, temperature sensors, or for an aesthetically pleasing design.
[John Peterson] showed us his Puzzlemation, animated tile puzzle at Maker Faire. It was originally designed for the Microchip 16-bit Embedded Control Design Contest. The puzzle is made from multiple modules each with an 8×8 LED grid. The tiles are battery powered and each one has PIC24FJ64GA004 microcontroller. They sit on a tray with flat copper strips as a serial bus. The tray controller broadcasts the animation to the tiles. Each tile waits for its unique identifier and saves that portion of the animation. The tiles don’t actually know what order they’re in so once the animation is in motion you can figure out their proper order; rearranging them so the animation is correct. We’ve got a video of it in action after the break.