[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.
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).
Continue reading “How-To: Web Server On A Business Card (Part 2)”
[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].
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]
[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.
[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.
Continue reading “Laser POV Projector”
Every project needs a power supply. As 3.3volt logic replaces 5volt systems, we’re reaching for the LM317 adjustable voltage regulator, rather than the classic 7805. We’ve found four different hobbyist-friendly packages for different situations.
A simple voltage divider (R1,R2) sets the LM317 output between 1.25volts and 37volts; use this handy LM317 calculator to find resistor values. The regulator does its best to maintain 1.25volts on the adjust pin (ADJ), and converts any excess voltage to heat. Not all packages are the same. Choose a part that can supply enough current for your project, but make sure the package has sufficient heat dissipation properties to burn off the difference between the input and output voltages.
Continue reading “Parts: LM317 Adjustable Voltage Regulator”
