Rotary Dial Authenticates Sudo Commands

February 1, 2011 by Mike Szczys 27 Comments

[W1ndman] won’t win any security awards for this build, but it’s an interesting idea. On many Linux-based systems commands can be run with administrator privileges by prefacing them with the keyword ‘sudo’. Normally you’d be asked for a password but [W1ndman] used the Pluggable Authentication Modules (PAM) to authenticate via his own shell script. That script checks a code from this rotary dial for authentication. An Arduino takes care of listening for each digit that is entered and then sends the code via USB for comparison with a stored file. We’re not sure if that stored code is in a plain file or is otherwise protected, but at the very least this prevents you from using ‘sudo’ willy-nilly.

Fermentation Temperature Control

February 1, 2011 by Mike Szczys 19 Comments

[Eric Friedrich] needed to keep the wort warm enough for yeast to ferment it into beer. To solve the problem he built his own fermentation temperature controler using a microprocessor to turn some heating tape on and off. You can see the heating element embracing that diminutive fermentation bucket in the picture above. This was originally meant for keeping reptile cages warm. It costs less than similar products meant just for brewing and works well for [Eric]. A DS1820 temperature sensor gives feedback to an ATmega168 which then uses a relay to switch the heat on and off. The target temperature can be changed using a potentiometer on the board, with the setting displayed on a character LCD screen on the project enclosure.

Nook Color Gets Honeycomb

February 1, 2011 by Caleb Kraft 18 Comments

[Deeper-blue] has released all the files necessary to get Android honeycomb working on your nook color. We had a chance to play with the nook color for a bit, but ours was only on Android version 2.1. It seems like they’ve come a long way with the capabilities of this simple e-reader since then. While he’s built out the majority of the features, it is still lacking some fundamentals, like sound. As you can see in the video after the break, the scrolling is a tiny bit choppy but the applications themselves see to be fairly snappy. We can’t wait to see how this works after a little improvement.

Continue reading “Nook Color Gets Honeycomb” →

Disco Death Ray

February 1, 2011 by James Munns 49 Comments

Wielding the power to melt glass or instantly ignite most day to day materials can be ~~intoxicating~~ pretty fun. With a little math, a lot of patience, and 5,800 1cm pieces of mirror, this build requires welding glasses just to look at the 1-2cm focal point. With an idea rumored to date back to Archimedes, this more portable parabolic project is perfect for your home burning needs. Unfortunately, this setup seems to have burnt itself to death at some point, though that makes room for version two, which will reportedly bump the mirror count to 32,000 or so.

There are plenty of other ways to make a death ray out there as well, including using lasers or lenses. Think you have a better tool of destruction? Be sure to tell us about it.

Keepon Finally Gets A Cheaper Version

February 1, 2011 by Caleb Kraft 9 Comments

Keepon, the adorable bot meant to help autistic kids with its jovial dance moves, seems to finally be getting a cheaper version. The original cost $30,000 and did a lot more than dance. Actually, we got to play with it a little bit at CES a couple years ago. The commercial version most likely won’t have facial recognition or any of the other fancy features of the first one, but we hope it can dance well. We’ve actually seen a couple home made versions and we’re hoping that the new one has some major hacking potential. The temptation to have one of these cute little bots around is made even stronger when you see that some of the money is going back into autism research.

What Development Board To Use?

February 1, 2011 by James Munns 173 Comments

Here at Hackaday, we see microcontroller based projects in all states of completion. Sometimes it makes the most sense to design systems from the ground up, and other times when simplicity or a quick project completion is desired, pre-built system boards are a better choice. We have compiled a list of boards that we commonly see in your submitted projects, split up by price range and with a little detail for reference.

After reading our list, sound off in the comments or on this forum post, and we may include your board in a follow-up guide at a later date. We will also be giving away 10 Hackaday stickers to the most insightful, the most original, and most useful advice given on the forum, so if you haven’t registered yet, now would be a perfect time. Winners of the sticker giveaway will be selected from the forum thread, and the final decision for prizes will be judged by the wit and whim of the Hackaday writing team. More prize details to follow in the thread. Read on for our guide based on past project submissions.

Continue reading “What Development Board To Use?” →

Video Game Installations For Kids’ Parties

February 1, 2011 by Mike Szczys 11 Comments

Why won’t someone think of the children?! Actually, some of the best hacks come from entertaining the little ones. Take [Piles of Spam’s] two video game builds. The first is a telescope-based controller that is used to shoot virtual cannon balls at a projection of a pirate ship. The second is a two-player cooperative game where one player drives and the other shoots. Both of them use a projector to display the playing field, an IR laser for targeting, and an NTSC camera to pick up the location of the laser dot. This works really well, thanks to the quality of the physical builds, and great audio and video on the game side of things. See for yourself in the clips after the break.

A couple of posts into the thread [Piles of Spam] talks about laser intensity. He wanted to make sure that there wouldn’t be a room full of half-blind five year olds thanks to the targeting system. Continue reading “Video Game Installations For Kids’ Parties” →