Composite Video Output on Chumby One (Hack)

December 28th, 2009

xobs recently completed a hack that adds a composite video output to the Chumby One. You can read step by step details on how to do it on the chumy wiki. The hack takes advantage of the fact that the CPU, a Freescale i.MX233, has a built-in composite video output that’s not connectorized, but available on the motherboard: you can solder a video cable to a set of pads as shown below (click for a larger version).

With a little case modding, you can have a very tidy video connector on the back as well.

In addition to the hardware mods, you need to install a modified kernel that contains the drivers for the video output, and call some scripts to switch the LCD output to the video output (instructions here). Unfortunately, you can only drive one screen at a time with the i.MX233, so it’s not the easiest to interact with, but it is pretty neat for passively displaying information on your TV. Just configure the chumby with your favorite channel, plug it into an unused composite input, and watch photo slideshows from your favorite photosharing website, news headlines, Twitter feeds, eBay auction status, etc. Or, you can use it to make your TV chuck-tastic:

Follow-up on the SSD

December 17th, 2009

A while back I asked readers for some advice on a reliable SSD. One reader also corroborated my experience with a story of his own Crucial drive’s failure, and a number of readers had recommended an Intel-branded drive. However, some research on the net indicated that several people had reported an unusually high failure rate on Intel drives as well, which leads me to think that possibly Intel is just doing a very good job of marketing their solution (they are pretty good at pushing bad technology to early adopters…there was Rambus, and Itanium…not to mention that of all the ISA’s out there, x86 wouldn’t be the one I’d chose to be the dominant standard). Or, as one comment pointed out, SSD is just not mature right now and it should be avoided altogether if soft-reliability is a key concern (as opposed to a reliability concern due to dropping or vibration damage).

I did end up getting a full refund for my return of the failed Crucial drive, and instead bought a 2.5″ 256 GB Samsung SSD (MMDOE56G5MXP-0VB) at a relatively decent price. I didn’t see too many complaints on the net about the Samsung drive, and I’m hoping the fact that Samsung is 100% vertically integrated for SSD manufacture (they make the FLASH, DRAM, and embedded controller for their SSDs, unlike all their other competitors) gives them some institutional expertise about Flash technology that they’ve baked into their product (how naive of me). I’ve been running with this drive for about a month now, and it hasn’t failed yet (knock on wood). I’m currently at about 160 Gbytes used out of 231 available (this is also one of the reasons why I couldn’t use an Intel drive, its largest capacity of 160GB was too small and SSD’s perform very poorly if you fill them up to near capacity due to the mismatch between erase block size and the native block size of the filesystem).

The Samsung drive is benchmarked to run a bit slower than the Intel and Crucial solutions, and anecdotally there might be a tiny performance decrease compared to the failed Crucial drive, but the system overall is still blazingly fast (and it’s still working). Searching my filesystem is super-fast, and I no longer loathe opening a directory with thousands of files. Boot time is cut down to about 70% of what it was before, and key applications load and quit much faster running off an SSD.

More importantly, I can now walk around with my laptop without first needing to park the hard drive heads. I can use it on bumpy car rides in Asia, and I can brave through turbulence without fear of crashed heads. Another major bonus is I now feel no worry turning the volume up on my laptop when listening to music. The thought of intentionally channeling a high-amplitude vibration into my hard drive always disturbs me, so I rarely listen to music on my laptop speakers, or when I do I make sure it’s very quiet. It’s well-documented that acoustic vibration reduces hard drive performance (here’s a YouTube video of someone shouting at a drive array in a datacenter, causing the array to slow down), and from my understanding it can actually contribute to premature failure of the drive. So, overall, I’d have to say I’m quite pleased with the new SSD, although I am proceeding cautiously — I bought a 64 GB USB thumb drive and I backup my data fairly often in anticipation of the dreaded day when my system seizes up on me again. And, when it does, I will probably once again buy another SSD, hoping that as time goes on the technology will mature and become more reliable.

ifixit Teardown of the Chumby One

December 17th, 2009

Kyle just sent me a link to a teardown of the chumby One on ifixit. His photos are, as usual, of impeccable quality!



Copycat Corolla?

December 13th, 2009

I saw this last week in China, and (un)fortunately traffic was moving slowly enough that I could snap a decent shot of it.

While Toyota is a household brand name, BYD is not — yet. For the uninitiated, BYD is a Chinese government-backed company that got its start making batteries for cell phones, and has expanded into just about everything, including cars (its strong background in making lithium ion batteries gives it a key part of the hybrid-electric car supply chain). Warren Buffet recently invested a couple hundred million dollars into the company, and everyone is expecting it to be a formidable player in the car market in the coming decades.

So when I saw this, I wasn’t sure if it was a stock Corolla to which a local enthusiast attached a BYD badge, or if it was a BYD copycat of our familiar brand-name Toyota car. Or, by some bizarre twist, perhaps Toyota is now using BYD to OEM their cars in China through a legitimized business relationship. I don’t know which is true, but according to the rumors I heard from people who saw this photo, this is actually a copycat Toyota made using plans purchased on the black market that were stolen from Toyota. Allegedly, someone in China who studies the automobile industry has taken one of these apart and noted that the welds are done by hand. In the original design, the welds were intended to be done by machine. Since the hand-welds are less consistent and of lower quality than the robotic welds, the car no longer has adequate crash safety. There are also other deviations, such as the use of cheap plastic lenses for the headlights. But, I could see that making a copycat Corolla is probably an effective exercise for giving local engineers a crash-course in world-class car manufacture.

Name that Ware December 2009

December 13th, 2009

The ware for December 2009 is shown below.

This ware is a guest ware submitted by tmbinc. It’s a fragment of a larger, no longer functional ware, and it’s seen some rough times, as you can tell by the crushed bond wires. Despite its dilapidated state, it’s still hardware pr0n for me — a piece of hardware I’d love to have but could never afford — made by an organization that I hold in high regard.