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Since I was unable to travel for a couple of years during the pandemic, I decided to take my new-found time and really lean into Rust. After writing over 100k lines of Rust code, I think I am starting to get a feel for the language and like every cranky engineer I have developed opinions and because this is the Internet I’m going to share them. The reason I learned Rust was to flesh out parts of t
Precursor (pre·cur·sor | \ pri-ˈkər-sər): 1. one that precedes or gives rise to; a predecessor; harbinger 2. a pocketable open development board Precursor is a mobile, open source electronics platform. Similar to how a Raspberry Pi or an Arduino can be transformed into an IoT gadget with the addition of a couple breakout boards, some solder, and a bit of code, Precursor is a framework upon which
The Essential Guide to Electronics in Shenzhen, Web Edition It’s taken me a long time to get around to doing this, but here’s a link for a free-to-download copy of “The Essential Guide to Electronics in Shenzhen”. The catalyst that prompted me to finally get around to this is the fact that Crowd Supply is now sold out (I think Adafruit is also sold out, too). Since the maps in the guide are now qu
Today at the Chaos Computer Congress (30C3), xobs and I disclosed a finding that some SD cards contain vulnerabilities that allow arbitrary code execution — on the memory card itself. On the dark side, code execution on the memory card enables a class of MITM (man-in-the-middle) attacks, where the card seems to be behaving one way, but in fact it does something else. On the light side, it also ena
Back in December, I posted that we’re building an open laptop. The post generated hundreds of comments, and I was surprised there was so much interest. To be honest, that was overwhelming. Also, there were many who didn’t get what we’re trying to do — as indicated by suggestions along the vein of “use a Core i7 and a fast nVidia graphics chip and sell it for under a hundred bucks and then I’d buy
First, there are no screws. The whole case snaps together. Also, there are (almost) no connectors on the inside. Everything from the display to the battery is soldered directly to the board; for shipping and storage, you get to flip a switch to hard-disconnect the battery. And, as best as I can tell, the battery also has no secondary protection circuit. The Bluetooth antenna is nothing more than a
We are building an open laptop, with some wacky features in it for hackers like me. This is a lengthy project. Fortunately, ARM CPUs are getting fast enough, and Moore’s Law is slowing down, so that even if it took a year or so to complete, I won’t be left with a woefully useless design. Today’s state of the art ARM CPUs — quad-core with GHz+ performance levels — is good enough for most day-to-day
The microSD ware for January 2010 was not an incidental post. It is actually snapshot of a much longer forensic investigation to find the ground truth behind some irregular Kingston memory cards. It all started back in December of 2009, when chumby was in the midst of production for the chumby One. A call came in from the floor noting that SMT yield had dropped dramatically on one lot, so I drove
The Ware for July 2024 is shown below. Thanks again to jackw01 for contributing this ware! The last two images might be killer clues that give away the ware, but they are also so cool I couldn’t not include them as part of the post. The Ware for June 2024 is a hash board from an Antminer S19 generation bitcoin miner, with the top side heatsinks removed. I’ll give the prize to Alex, for the thought
Formlabs has recently launched the fourth edition of their flagship SLA printer line, the Form 4. Of course, I jumped on the chance to do a teardown of the printer; I’m grateful that I was able to do the same for the Form 1, Form 2, and Form 3 generations. In addition to learning a lot from the process of tearing down a single printer, I am also gaining a unique perspective on how a successful har
After many months of hard work, chumbys are finally rolling off the line from China in volume. I just got back from an operations review of the factories in China. You can see the final assembly process for the chumby in the movie below! You can (finally) buy a chumby now simply by visiting the Chumby on-line store (no more waiting for invitations), so you too can have a chumby Christmas (while su
For hackers, the fun part of consumer electronics is taking things apart and making them do things they weren’t originally meant to do. Since most consumer electronics devices are closed source, it’s a laborious process to do a hack; first you must reverse engineer the platform, and you are often relying on gut and instinct to grope around at the edges of your knowledge about the platform. Thus, o
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