Beginner Concepts: LPT Instead Of UC

March 27, 2010 by Mike Szczys 28 Comments

We see it all the time, a post based on an Arduino board with multiple comments calling it overkill. How exactly should you control your homemade peripherals if you’re not using a microcontroller (uC)? [JKAbrams] and [Tim Gremalm] answered that question with this printer port (LPT) adapter. They wanted an indicator light when someone in an IRC room was talking to them. By connecting a blue rotating light through a relay to the output of this fob they’ve done just that, but there’s room for much more.

The adapter uses a Darlington transistor array IC to protect the computer. A resistor between the LPT and the base pin on the chip ensures that current flow will be well within the safe levels for the computer. The Darlington transistor amplifies the output using an external power supply in order to drive heavier loads.

If you want a deeper understanding of the printer port check out this tutorial. LPT ports are becoming less common and that’s why so many projects are migrating over to USB (plus there’s no need for external power with most USB connected projects) but if you’ve got one, it’s probably not being used for anything else.

PC Cooling Using 1000 Ft^2 Geothermal

March 22, 2010 by Mike Szczys 36 Comments

Are you still using heat sinks and fans to cool your computer? Lame. Tearing up your property to bury geothermal coils is definitely the way to go. [Romir] has been working on this for about a month and is just getting back data from the first multi-day tests. Take some time to dig through his original post. It includes something of a table-of-contents for the 35 updates he’s posted so far. Closed loop cooling seems to be trendy right now, we just didn’t expect to see a system this large as part of a personal project. The last one we looked at used just six meters of pipe.

Hacker Finds Better Use For A Windows Machine

March 1, 2010 by Mike Szczys 34 Comments

[Patrick Becker] had an ancient PC on his hands with a blown PSU. He converted this into a stylish home for his Betta splendens.

The aquarium itself is fashioned from a piece for construction glass block with the top cut off. This allows for a window that looks through the tank and shows off the motherboard on the other side. He patched into the AC connector so that the original power cord can be used to control the pump. A lighted pump button was added to the front panel and a fancy bezel fitted to the viewing portal in the side of the case. He finished off the project with a PVC pipe for air and food. His blue screen of death now features water and a real fish.

The Uber Eeepc

February 18, 2010 by Caleb Kraft 13 Comments

[F00] wrote in to show us his Eeepc that has been modded with almost every upgrade you can cram in one. He has an external cantenna for his wifi, an iPod hard drive, touch screen, added bluetooth with indicator lights, and an internal USB drive for booting linux. While the details are somewhat lacking on his site, you can find an article here for every piece you need to recreate his work. We’ve covered adding the touch screen, mounting external antennas, doing it all without solder, even changing the form factor. Not to mention the other Eeepc we’ve seen that was extremely well endowed.

GuruPlug, The Next Generation Of SheevaPlug

February 8, 2010 by Mike Szczys 50 Comments

Meet GuruPlug, an all-in-one server that is now available for pre-order. This is the next generation of the popular SheevaPlug that features some added goodies. The base model sells for the same $99 and appears to have the same specs as the original but for $30 more, the GuruPlug Server PLUS moves to 2 Gigabit Ethernet ports, one eSATA connector, and built-in WiFi and Bluetooth. All of this for $129 and it only pulls 5 watts? Wow.

Update: Thanks to [Foerdi] and to [Phil Burgess] for the pointing out that the hardware diagram on the features page shows WiFi and Bluetooth for both models.

[Thanks Chris]

ExoPC Shows Off Some Guts

February 7, 2010 by Caleb Kraft 10 Comments

The folks over at Engadget have posted some pictures of the ExoPC’s insides. With the recent return of the tablet craze (remember xp tablet edition?) we’re seeing tablets everywhere. This one has some promise on the hardware side, sporting a 1.6GHz processor and 2GB of RAM. Unfortunately we’ve heard using solely a tablet interface with windows7 is somewhat cumbersome even with the built in improvements. We’re not too worried though, a customized appliance style linux interface probably won’t be too far off.

The last couple times we mentioned tablet style computing, people have emailed us about the Touchbook. It also seems pretty cool, but seems like switching applications is visibly laggy in the demo video. Then again, a slimmed down interface might reduce some of that drag.

C64 Interface For Your Computer

January 23, 2010 by Caleb Kraft 24 Comments

Before we get started, lets just point out that this C64 was broken. He did not take a functional C64 out of operation for this. What he did do, was to build a hardware interface for for his VICE system. For those unfamiliar, VICE is a cross platform C64 emulator. [Simon] points out that the old games just weren’t as much fun without the original hardware. Having a broken C64 lying around, he put it to good use. It now acts as the interface for all the original fun stuff.

If you are a fan of the hardware, but just want to interface it as a normal USB keyboard, that is possible as well.