Paintball Gun Turret

February 26, 2009 by Eliot 39 Comments

[Jared Bouck] has been sending in his projects for a couple years now. We’ve enjoyed his heavy-duty DDR pads, LCD backlight repair, and ion cooling projects. His latest, an RC paintball gun turret, is our favorite though. He actually rates this as one of the easier projects he’s published; it just took a while to assemble. Several design decisions were made to keep the project simple. Two 32 Degrees Icon-E paintball guns were used. The guns already have electric solenoids for firing, so a special trigger mechanism didn’t have to be fashioned. Q-loaders were used to prevent any ball feed problems. The motors, driver boards, and RC components are all borrowed from combat robots for reliability. He’s hoping to produce a small number of kits based on this design.

Related: We’ve got quite a few sentry gun projects in the archive.

Kindle 2 Teardown

February 25, 2009 by Eliot 25 Comments

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The people at iFixit have shown that they’re still on top of their game by tearing down the new Kindle 2 eBook reader. The main processor is a 532MHz ARM-11 from Freescale. Interestly, there isn’t any significant circuitry behind the large keyboard; it seems its existence is just to hide the battery.

[via Make]

Sslstrip, Hijacking SSL In Network

February 23, 2009 by Eliot 21 Comments

Last week at Black Hat DC, [Moxie Marlinspike] presented a novel way to hijack SSL. You can read about it in this Forbes article, but we highly recommend you watch the video. sslstrip can rewrite all https links as http, but it goes far beyond that. Using unicode characters that look similar to / and ? it can construct URLs with a valid certificate and then redirect the user to the original site after stealing their credentials. The attack can be very difficult for even above average users to notice. This attack requires access to the client’s network, but [Moxie] successfully ran it on a Tor exit node.

X11 On Android

February 22, 2009 by Eliot 18 Comments

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[ghostwalker] has put together instructions for running X11 on your Android device. This means you can run a full-blown Linux desktop environment on your phone. It requires you to already have a Debian shell on the phone, which we covered earlier. Instead of having to come up with a custom display driver, it’s hooked to a VNC server. You can connect to it using an Android VNC viewer on the phone or via any other VNC client. The how-to suggests either IceWM or the even lighter-weight LXDE for a window manager. You could potentially install Gnome or KDE, but we’d be surprised if it was any faster than dog slow. Let us know if you have any success with this and what you think the best use is.

QRSS: Radio Amateurs’ Slow-speed Narrowband

February 22, 2009 by Eliot 30 Comments

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Host of the Soldersmoke podcast, [Bill Meara], contributed this guest post.

While the rest of the world is moving toward high speed broadband, some hams—including one Nobel Prize winner—are going in exactly the opposite direction. Our ‘QRSS’ mode makes use of an unusual mixture of modern digital signal processing (DSP), ancient Morse code, and simple homebrewed transmitters. Very narrow bandwidth is desirable because this reduces the noise in the radio communication channel, greatly improving the S/N ratio. But Shannon’s communication theory tells us that narrow bandwidth comes with a cost: slow data rates. In QRSS, beacon transmitters using only milliwatts churn out slow speed Morse ID signals on 10.140 MHz that are routinely picked up by DSP-based receivers on the other side of the globe. Many of the receivers, ‘grabbers’, have visual outputs that are available online in real time. QRSS has been getting a lot of attention on the Soldersmoke podcast and on the Soldersmoke Blog. For more information check out this overview and the hardware involved. Here’s a gallery of received signals.

Dell Mini 9 OSX Install

February 21, 2009 by Eliot 36 Comments

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Installing OSX on commodity PC hardware has advanced a lot since the early days of OSx86 when Apple switched to Intel. With the advent of netbooks, a new target platform has emerged; one that doesn’t have an official Apple equivalent. The small subset of models means that it’s easy to find someone else that has the same machine as you, but it still takes some forum walking to bring all the pieces together. Gizmodo has done this and compiled a comprehensive guide for the Dell Mini 9. The Mini 9 is a very nice machine and according to Boing Boing Gadgets’ chart, one of the most compatible with OSX. Earlier this week you could purchase a new one for just $200.

For Gizmodo’s install, they used a Leopard retail DVD with [Type11]’s bootloader. They’re breaking the EULA, but at least it’s not piracy. They had to use both a DVD drive and a USB hard drive because device recognition was flakey. Despite this, the actual install process doesn’t appear to be too difficult. They say all the hardware works, “The Mini 9 is a beautiful OS X machine.” Check out this Hackit to learn about netbook OSX experiences from other Hack a Day readers.

Stantum’s High Precision Multitouch

February 19, 2009 by Eliot 9 Comments

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We love keeping track of new interaction technologies and this new touchscreen by Stantum looks especially promising. Engadget shot a hands-on video with it at the Mobile World Conference. It’s a resistive screen, so it can be used with both fingers and styluses (unlike capacitive screens). It’s sensitive enough that you could use a brush too. The screen supports any number of multitouch points and does pressure sensing based on the size of the detected fingertip. The touch detection is actually more accurate than the screen can display. Stantum is hoping mobile manufactures will pick up their input framework for inclusion in new devices. The resistive touchscreen was built to Stantum’s specifications (it won’t work with current phones), but they say it wouldn’t be hard to go into mass production.