[Max Weisel] recently created a Peltier-based cooling/heating system that fits into a backpack. The system uses two Peltier units, each running at 91.2 watts, with computer heat sinks mounted on one side of the unit to dissipate the excessive amounts of heat generated. While he was originally trying to build a cooling backpack, the use of the Peltier units meant that the cool side would become warm when the direction of current was switched, meaning that the backpack could become a heating backpack with the flip of a switch. In order to power the two Peltier units, he uses two 12v motorcycle batteries, weighing in at around 5 pounds each. While this backpack might be a little heavy for your back, it looks promising for anyone who needs to keep things cool (or warm) on the go.
Misc Hacks4117 Articles
History Hacker Show Pilot Tonight
[Bre Pettis], the former host of the Make podcast and member of NYCResistor has gotten his own show. Debuting tonight on the History Channel, “History Hacker” will be exploring our technological past through hacking. He reminds us on his site, this is just the pilot, it has to get ratings to have more episodes. [Bre] suggests watching it with the family as it should be educational and fascinating. Catch it tonight at 8pm and midnight.
How-To: Web Server On A Business Card (Part 2)
This mini web server is slightly smaller than a business card. There are a lot of tiny one-board servers out there, but this is probably the smallest you can etch and solder at home. Unlike many embedded web servers, files are stored on a PC-readable SD card, not in a difficult-to-write EEPROM. Read on for the web server design, or catch up on PIC 24F basics in the previous article: Web server on a business card (part 1).
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Arduino Solenoid Concert
[youtube=http://www.youtube.com/watch?v=g_hiz-Kx0kM]
[jay] reminded us of this old video of solenoids banging rhythms on furniture and household objects. There’s no schematic, but in the video it looks like an Arduino drives a bunch of solenoids through relays. The PC interface is run on Pure Data, an open source programming environment for audio, video, and graphic processing. Thanks [Jay].
Reliable Instructions For OSX On The EeePC
We have run many EeePC hacks before. Like most people, what we really want is a Mac netbook. The folks over at Wired have written up some nice instructions to help you run OSX on your EeePC. The process is a little involved, so don’t expect to just pop in a disk and be home free. There are a few setbacks though. No flash support, hardware F-keys don’t work (volume, brightness, etc), and ethernet doesn’t work. WiFi works but only with a third party driver/app.
[via Gizmodo]
Accelerometer Controlled Pong
[youtube=http://www.youtube.com/watch?v=jYVgXYtxk4E]
[Perry’s] awesome AcceLED Pong project gives new life to a classic game by adding acceleration-based control. The pong paddles are moved by tilting the circuit left or right. Motion is measured by an ADXL203 dual axis accelerometer, and an ATMEGA32 microcontroller converts acceleration into ball and paddle movement. The game display is a three-color SparkFun 8×8 LED matrix with serial interface.
[Perry] also used a similar setup to make a USB LED spectrum analyzer fed by the Linux XMMS media player.
Laser POV Projector
[shakirfm] sent us this LED persistence of vision (POV) laser projector that can display dot matrix style text. The laser projector contains a rotating mirror assembly and 5 lasers. We’ve covered other POV projectors,but this one is a bit different. The mirror assembly rotates using two cooling fans. Controlling on/off times of the lasers along with the mirror speed, it is able to project 8×5 dot matrix ASCII text onto a surface.
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