[Gnif] had a recent hard drive failure in his home server. When rebuilding his RAID array, he decided to update to the ZFS file system. While researching ZFS, [Gnif] learned that the file system allows for a small USB cache disk to greatly improve his disk performance. Since USB is rather slow, [Gnif] had an idea to try to use an old i-RAM PCI card instead.
The problem was that he didn’t have any free PCI slots left in his home server. It didn’t take long for [Gnif] to realize that the PCI card was only using the PCI slot for power. All of the data transfer is actually done via a SATA cable. [Gnif] decided that he could likely get by without an actual PCI slot with just a bit of hacking.
[Gnif] desoldered a PCI socket from an old faulty motherboard, losing half of the pins in the process. Luckily, the pins he needed still remained. [Gnif] knew that DDR memory can be very power-hungry. This meant that he couldn’t only solder one wire for each of the 3v, 5v, 12v, and ground pins. He had to connect all of them in order to share the current load. All in all, this ended up being about 20 pins. He later tested the current draw and found it reached as high as 1.2 amps, confirming his earlier decision. Finally, the reset pin needed to be pulled to 3.3V in order to make the disk accessible.
All of the wires from his adapter were run to Molex connectors. This allows [Gnif] to power the device from a computer power supply. All of the connections were covered in hot glue to prevent them from wriggling lose.
[Daniel] was looking for a special gift to make for his close friend. His friend is a huge fan of the Myst franchise which made the decision easy — why not make a Myst Linking Book?
After doing some research he discovered that the book in the game footage was a Harper’s New Monthly Magazine, Volume LIV, Issue 312 from 1877. He attempted to find one on eBay but they were pretty expensive — and in pretty rough shape. So instead he settled on a copy of Scribner’s Monthly Magazine,Volume XL, Nov 1875 to Apr 1876. Not quite identical but close enough!
His original plan was to embed a Raspberry Pi with an LCD screen to show off the Myst videos, but then discovered the cheap and easy to use video greeting card modules, which you can pick up for $10-20 from China. They typically let you store about five videos and use a magnetic reed switch to activate — almost like it was designed for this project!
Continue reading “Myst Linking Book”
Unless you live off-the-grid and have abundant free electricity, leaving your rig on while you go away on trips is hardly economic. So if you’re like [Josh Forwood] and you happen to use a remote desktop client all the time while on the road, you might be interested in this little hack he threw together. It’s a remote Power-On-PC from anywhere device.
It’s actually incredibly simple. Just one Arduino. He’s piggybacking off of the excellent Teleduino software by [Nathan] who actually gave him a hand manipulating it for his purpose. The Arduino runs as a low-power server which allows [Josh] to access it via a secure website login. From there, he can send a WOL packet to his various computers to wake them up.
The system is working so well, he’s set it up with all his roommates’ computers as well, giving each their own login information on the Arduino’s page to allow them to access their own computer. Not a patient fellow, he also wanted a way to tell when his desktop would be ready to access…
Continue reading “Turn on your computer from anywhere with an Arduino Server”
Sure, it’s a great idea to keep your computer components cool…. but why? PC components consume energy and in doing so they generate heat. That heat can reduce overall system performance or even damage specific parts. You’ve certainly noticed those huge aluminum finned heatsinks covering critical components in your PC. They are there for a reason, to keep things cool. Most PC’s have at least one fan, if not several, usually only a few inches in diameter. If a small fan does an okay job at cooling a PC, how would a large fan do….. we’re talking a really large fan? [Envador] wanted to find out and made a PC case with the largest fan possible.
Looking at the photo it is pretty obvious that PC case frame is fabricated from standard PVC piping. The side of the case is hinged to allow access to the internal components. That huge set of blades started out as an off-the-shelf box fan. It was taken apart and mounted directly to the PVC case door. It wouldn’t make too much sense to have side panels on this case since the fan is so large. So, instead of solid sides [Envador] used chrome-plated plastic grills that are usually reserved for fluorescent ceiling lights. Perforated metal strapping holds all the drives, power supply and mother board in place.
Unfortunately, [Envador] doesn’t give any before/after temperature data but states that the PC tops out at 95°F and he hasn’t had any problems with computer performance.
Moving the cursor around your computer screen is an everyday occurrence that we humans do not give much of a second thought to. But what if you didn’t have to move your hands from the keyboard anymore? Sure there are keyboards with Track Point or even track pads not to far from the keys, which isn’t too bad. What if you could just slightly point your face in the desired direction the mouse would move? The [Sci-Spot] folks wondered that same question and came up with a DIY Head Mouse.
The concept is pretty darn simple; a web cam is mounted to the user’s head and points at the computer screen. Mounted on top of the screen is one IR LED. Our eyes can not see the IR light so it is not annoying or distracting. The camera, however, is filtered to only see IR by placing a couple of layers of camera film negative over the lens. Before you go complaining about strapping a camera to your noggin just think of building it into a hat, which we’ve seen used for adaptive technologies like this PS3 controller.
Custom software was written to move the mouse cursor; see the black window in the above dialog box? That represents the webcam’s field of view and the white spot is the IR LED. When the user’s head moves, the IR LED moves in relation to the camera’s field of view, in turn telling the computer to move the cursor a certain amount. There are a couple of options available like ‘magnification’ which changes how much the cursor moves with a given amount of head movement and ‘deadzone’ that ignores extremely small movements that can result from breathing.
There is no mention of how button clicks are recorded but we think a couple of buttons right below the space bar would be great. The control software is available for download on the Sci-Spot page for those who want to make their own.
After [Travis]’s media server died a couple months ago, his brother [Nick] secretly plotted to replace it for Christmas. Admitting it to be an “asinine Rube Goldberg” arrangement, [Nick] wanted something custom and remarkable for his sibling. Rather than go the normal SATA route, 38 USB hot-swap laptop drives were clustered together inside a custom leather enclosure with a bronzed glass top.
[Nick] picked up 45 of the 500GB drives for only $350 and designed the project around those. He spent $1000 on matching metal docks for each of them, powered by $800 worth of PCIe quad independent USB controllers – no hubs. A $550 Xeon motherboard with 14 USB ports, 16GB of RAM, a basic video card and a 1000W power supply rounded out the electronics.
Under Windows 8.1 all drives are arranged in a single giant array under Storage Spaces, no raid.
Everything was built into a wood-framed coffee table wrapped in high-end leather that [Nick] spent 65 hours hand stitching himself. Fancy brass corner braces hold the frame square. All the wires were run underneath the table so the visible surfaces are clean and clear. The table structure is lifted up on legs made from half-inch square barstock bent into a hairpin and bolted to the underside.
All together [Travis]’s Zerg-Berg media server cost in the range of $4500. [Nick] intends it to be something that lasts him a very long time.
See the video below for [Nick]’s
rationalization explanation of the hardware and methods chosen.
Continue reading “Brother Builds “Zerg-Berg” Coffee Table Media Server – 38(!) USB Drives”
A group of Harvard chemists have come up with a novel use for fire. Through experimentation, they have been able to build what they call an InfoFuse. As the name implies, it’s essentially a burning fuse that can “transmit” information.
The fuse is made from flash paper, which is paper made from nitrocellulose. Flash paper burns at a relatively constant speed and leaves no smoke or ash, making it ideal for this type of project. The chemists developed a method of conveying information by changing the color of the flame on the paper. You might remember from high school chemistry class that you can change the color of fire by burning different metal salts. For example, burning copper can result in a blue flame. This is the key to the system.
The researchers dotted the flash paper with small bits of metal salts. As the flame reaches these spots, it briefly changes colors. They had to invent an algorithm to convert different color patterns to letters and numbers. It’s sort of like an ASCII table for fire. Their system uses only three colors. The three colors represent eight possible combinations of color at any given time. Just two quick pulses allow the researchers to convey all 26 letters of the English alphabet as well as ten digits and four symbols. In one test, the researchers were able to transmit a 20 character message in less than 4 seconds.
[Ben Krasnow] found the Harvard project and just had to try it out for himself. Rather than use colors to convey information, he took a more simple approach. He started with a basic strip of flash paper, but left large tabs periodically along its length. As the paper burns from end to end, it periodically hits one of these tabs and the flame gets bigger momentarily.
[Ben] uses an optical sensor and an oscilloscope to detect the quantity of light. The scope clearly shows the timing of each pulse of light, making it possible to very slowly convey information via fire. Ben goes further to speculate that it might be possible to build a “fire computer” using a similar method. Perhaps using multiple strips of paper, one can do some basic computational functions and represent the result in fire pulses. He’s looking for ideas, so if you have any be sure to send them his way! Also, be sure to check out Ben’s demonstration video below. Continue reading “This Message will Self Destruct… as You Read It?”