New Teensy 4.1 Arrives With 100 Mbps Ethernet, High-Speed USB, 8 MB Flash

May 11, 2020 by 83 Comments

It was only last August that PJRC released Teensy 4.0. At that time, the 4.0 became the fastest microcontroller development board on the planet, a title it still holds as of this writing — or, well, not exactly. Today the Teensy 4.1 has been released, and using the same 600 MHz ARM Cortex M7 under the hood, is now also the fastest microcontroller board. What the 4.1 brings to the table is more peripherals, memory, and GPIOs. While Teensy 4.0 used the same small form factor as the 3.2, Teensy 4.1 uses the larger board size of the 3.5/3.6 to expose the extra goodies.

The now slightly older Teensy 4.0 — released on August 7th of last year — is priced at $19.95, with the new 4.1 version offered at $26.85. It seems that the 4.1 isn’t intended as a replacement for the 4.0, as they serve different segments of the market. If you’re looking for an ultra-fast affordable microcontroller board that lives up to its Teensy name, the 4.0 fits the bill. On the other hand, if you need the additional peripherals broken out and can afford the space of the larger board, the not-as-teensy-sized 4.1 is for you. How big is it? The sample board I measured was 61 x 18 mm (2.4 x 0. 7″), not counting the small protrusion of the micro-usb jack on one end.

Let’s have a look at all the fun stuff PJRC was able to pack into this space. Continue reading “New Teensy 4.1 Arrives With 100 Mbps Ethernet, High-Speed USB, 8 MB Flash” →

Pentesting Hack Chat This Wednesday

May 11, 2020 by 3 Comments

Join us on Wednesday, May 13 at noon Pacific for the Pentesting Hack Chat with Eric Escobar!

Ask anyone in this community to name their dream jobs and chances are pretty good that penetration tester will be somewhere on the shortlist. Pentesters are allowed — nay, encouraged — to break into secure systems, to test the limits and find weak points that malicious hackers can use to gain access. The challenge of hacking and the thrill of potentially getting caught combined with no chance of prosecution? And you get paid for it? Sounds good to us!

Professional pentesting is not all cops-and-robbers fun, of course. Pentesters have to stay abreast of the latest vulnerabilities and know what weaknesses are likely to exist at a given facility so they know what to target. There are endless hours of research, often laborious social engineering, and weeks of preparation before actually attempting to penetrate a client site. The attack could be as complex as deploying wireless pentesting assets via FedEx, or as simple as sprinkling thumb drives in the parking lot. But when it comes, a pentest often reveals just how little return companies are getting on their security investment.

As a consultant for a security firm, Eric Escobar gets to challenge companies on a daily basis. He’s also a regular on the con circuit, participating in challenges like Wireless CTF at DEF CON… until he won too many times. Now he helps design and execute the challenges, helping to share his knowledge with other aspiring pentesters. And he’ll stop by the Hack Chat to do the same with us, and tell us all about the business of keeping other businesses in business.

join-hack-chatOur Hack Chats are live community events in the Hackaday.io Hack Chat group messaging. This week we’ll be sitting down on Wednesday, May 13 at 12:00 PM Pacific time. If time zones have got you down, we have a handy time zone converter.

Click that speech bubble to the right, and you’ll be taken directly to the Hack Chat group on Hackaday.io. You don’t have to wait until Wednesday; join whenever you want and you can see what the community is talking about. Continue reading “Pentesting Hack Chat This Wednesday” →

A More Open Raspberry Pi Camera Stack With Libcamera

May 11, 2020 by 15 Comments

As open as the Raspberry Pi Foundation has been about their beloved products, they would be the first to admit there’s always more work to be done: Getting a Pi up and running still requires many closed proprietary components. But the foundation works to chip away at it bit by bit, and one of the latest steps is the release of a camera stack built on libcamera.

Most Linux applications interact with the camera via V4L2 or a similar API. These established interfaces were designed back when camera control was limited and consisted of a few simple hardware settings. Today we have far more sophisticated computational techniques for digital photography and video. Algorithms have outgrown dedicated hardware, transforming into software modules that take advantage of CPU and/or GPU processing. In practice, this trend meant bigger and bigger opaque monolithic pieces of proprietary code. Every one a mix of “secret sauce” algorithms commingling with common overhead code wastefully duplicated for each new blob.

We expect camera makers will continue to devise proprietary specialties as they seek a competitive advantage. Fortunately, some of them see benefit in an open-source framework to help break up those monoliths into more manageable pieces, letting them focus on just their own specialized parts. Leveraging something like libcamera for the remainder can reduce their software development workload, leading to faster time to market, lower support cost, and associated benefits to the bottom line that motivates adoption by corporations.

But like every new interface design borne of a grandiose vision, there’s a chicken-and-egg problem. Application developers won’t consume it if there’s no hardware, and hardware manufacturers won’t implement it if no applications use it. For the consumer side, libcamera has modules to interop with V4L2 and other popular interfaces. For the hardware side, it would be useful to have a company with wide reach who believes it is useful to open what they can and isolate the pieces they can’t. This is where the Raspberry Pi foundation found a fit.

The initial release doesn’t support their new High-Quality Camera Module though that is promised soon. In the short term, there is still a lot of work to be done, but we are excited about the long term possibilities. If libcamera can indeed lower the barrier to entry, it would encourage innovation and expanding the set of cameras beyond the officially supported list. We certainly have no shortage of offbeat camera sensor ideas around here, from a 1-kilopixel camera sensor to a decapped DRAM chip.

[via Hackster.io]

Making A Gorgeously-Twisty Sculpture, Using Only Flat Pieces

May 11, 2020 by 2 Comments
Closeup of unique pieces that make up the final scuplture.

The sculpture shown here is called Puzzle Cell Complex and was created by [Nervous System] as an art piece intended to be collaboratively constructed by conference attendees. The sculpture consists of sixty-nine unique flat panel pieces, each made from wood, which are then connected together without the need for tools by using plastic rivets. Everything fits into a suitcase and assembly documentation is a single page of simple instructions. The result is the wonderfully-curved gyroid pattern you see here.

The sculpture has numerous layers of design, not the least of which was determining how to make such an organically-curved shape using only flat panels. The five-foot assembled sculpture has a compelling shape, which results from the sixty-nine individual panels and how they fit together. These individual panel shapes have each been designed using a technique called variational surface cutting to minimize distortion, resulting in their meandering, puzzle-piece-like outlines. Each panel also has its own unique pattern of cutouts within itself, which makes the panels lighter and easier to bend without sacrificing strength. The short video embedded below shows the finished sculpture in all its glory.

Continue reading “Making A Gorgeously-Twisty Sculpture, Using Only Flat Pieces” →

Iron Pipe Makes A Great Workbench

May 11, 2020 by 41 Comments

It’s a frequently encountered problem in any workshop; how do you make a bench? And once you’ve made a bench, how do you put it on wheels to move it about? [Eric Strebel] needed a cart for his laser cutter, so he designed his own in an unexpected material: malleable iron pipe.

The attraction of iron pipe is its ready availability and ease of assembly. [Eric] created a sturdy table complete with a worktop made from a solid door in a very short time. T pieces and joiners were used, along with a hefty set of flanges for the tabletop itself. The casters are the expanding stem variety, with a compressed rubber insert expanding to hold them securely in place.

The result as can be seen in the video below is a really neat trolley for the cutter, followed quickly by another workbench. It would be interesting to know more about this material, parameters such as its wall thickness and lateral strength, because in a table without any cross-bracing it becomes important to avoid an untimely collapse.

The most common material for benches seems still to be wood, indicating that for such a technophile community we can be surprisingly conservative in our choices. Sometimes though, benches are made from the most surprising things.

Continue reading “Iron Pipe Makes A Great Workbench” →

Lowering The Boom On Yagi Element Isolation

May 10, 2020 by 19 Comments

Antenna design can be confusing, to say the least. There’s so much black magic that goes into antennas that newbies often look at designs and are left wondering exactly how the thing could ever work. Slight changes in length or the angle between two elements result in a vastly different resonant frequency or a significant change in the antenna’s impedance. It can drive one to distraction.

Particularly concerning are the frequent appearances of what seem to be dead shorts between the two conductors of a feedline, which [andrew mcneil] explored with a pair of WiFi Yagi antennas. These highly directional antennas have a driven element and a number of parasitic elements, specifically a reflector behind the driven element and one or more directors in front of it. Constructive and destructive interference based on the spacing of the elements and capacitive or inductive coupling based on their length determine the characteristics of the antenna. [Andrew]’s test antennas have their twelve directors either isolated from the boom or shorted together to the shield of the feedline. In side-by-side tests with a known signal source, both antennas performed exactly the same, meaning that if you choose to build a Yagi, you’ve got a lot of flexibility in what materials you choose and how you attach elements to the boom.

If you want to dive a little deeper into how the Yagi works, and to learn why it’s more properly known as the Yagi-Uda antenna, check out our story on their history and operational theory. And hats off to [andrew] for reminding us that antenna design is often an exercise in practicality; after all, an umbrella and some tin cans or even a rusty nail will do under the right circumstances.

Continue reading “Lowering The Boom On Yagi Element Isolation” →

Clear Some Space And Build A Cosmo Clock

May 10, 2020 by 4 Comments

Like many of us, [Artistikk] is inspired by astronauts and space travel in general. To keep the inspiration coming, he made the Cosmo Clock — a sleek little clock that changes color whenever an astronaut is launched into space.

As awesome as space is, we’re inspired by the amount of Earth-saving reuse going on in this project. The actual time-telling is coming from a recycled wristwatch movement. [Artistikk] cut a bigger set of hands for it out of a plastic container, and used the lid from another container for the clock’s body.

The launch inquiries are handled by an ESP8266, which uses a Blynk app and some IFTTT magic to get notified whenever NASA yeets an astronaut into space. Then the ESP generates random RGB values and sends them to a single RGB LED. The clock body is small enough that a single LED is bright enough to light up all the parts that aren’t blacked out with thick paper. In case you’re wondering, the pattern around the edge isn’t random, it’s Morse code for ‘sky’, but you probably already knew that, right? Make a dash past the break to take the tour.

Clocks that wind up in space are much more complicated. Check out this tear-down of the clock from a late-90s Soyuz spacecraft.

Continue reading “Clear Some Space And Build A Cosmo Clock” →