I ordered a Raspberry Pi Zero from Adafruit in their Startup Pack right after they were released. There are a few Greater Than Zero Pis (GTZPi) already on my workbench so my purchase was driven by curiosity, not necessity. With no rush on delivery it eventually got here, and I finally got around to looking at it. My experience with the Pi family began with the Pi B+ and, shortly after that, the Pi 2. The speed difference between them was noticeable so I decided to dive in and further test the performance of the Zero.
There are so many hacks in this project it’s hard to know where to start. So let’s start at the SailPi tablet which is a Raspberry Pi running the Sailfish OS on an LCD touch screen powered by a cell phone battery pack. The design looks more like a high-tech sandwich with the Pi in the middle than a tablet. Despite the appearance it works, at that’s what counts. The creator, [Aleksi Suomalainen] expended a lot of effort pulling all the pieces together on this project.
The Sailfish OS project is targeted at creating a new OS for mobile devices, especially cell phones. It is open source which invites developers to contribute to the project. The touch screen user interface is designed for ease of use by gestures from one finger on the hand holding the phone.
[Aleksi] ported Sailfish to a Pi 2 during a hacking week. He’s shared the code for it on his blog. During the hack week he played with accessing the GPIO on the Pi to flash an LED. To get you up and running quickly he provided an image you can load onto an SD.
It appears the Pi is finding a niche for OS hackers in addition to the hardware hackers using the GPIO.
Don’t miss the demo after the break to see the OS running on the Pi. Continue reading “Raspberry Pi Tablet Based on Sailfish OS”
When the ever-versatile Raspberry Pi was released, the potential for cheap video game emulation was immediately obvious. Some of the very first Raspi projects to hit the internet were arcade cabinets, and it wasn’t long until people were making them portable. A purpose-build Linux distort called RetroPie has become very popular specifically because of the Raspi’s game-emulation potential. However, the actual hardware for these emulation systems isn’t always the most aesthetically (or ergonomically) pleasing. That’s where reddit user [Cristov9000] has managed to stand out from the crowd.
[Cristov9000] accomplished this by combining high-quality design (and 3D printing) with the careful use of original Nintendo parts. Game Boy and SNES buttons and elastomers were used to achieve the correct button feel. Other original Game Boy parts, like the volume wheel and power switch, ensure that the system feels as much like 1989 OEM hardware as possible.
Also impressive is the internal hardware, including 3 custom PCBs used to tie everything together to work via the Raspberry Pi 2 GPIO pins. The display is a 3.5″ TFT screen, and with the 6000 mAh it can handle gameplay for more than 7 hours. Other details, like the integrated mono speaker and rear shoulder buttons complete the experience. Combined with the RetroPie and an assortment of emulators, this is one of the most impressive portable gaming builds we’ve seen, especially among a crowded list of awesome raspi-based Game Boy builds.
On the scale of awesomeness, writing an operating system ranks near the top for software hackers and ranks just below writing a whole new language. [Lukas F. Hartmann] is reaching for the epic status with the Raspberry Pi operating system dubbed Interim. In an interesting mixture of old and new, it’s written in LISP!
LISP (LISt Processing) is the second oldest high-level programming language that received wide-spread usage. The only one older is FORTRAN (FORMula TRANslation), and that is just by one year. LISP is generally associated with artificial intelligence research but it also surfaced as a utilitarian scripting language in various applications like AutoCad. You may have also heard of a more recent dialect, Clojure, which has been receiving a lot of attention.
The source code, an image for the Pi 2, and directions for making it all work are available. [Lukas] also describes how to get a new OS up and running on a Pi.
[Lukas] isn’t the first to create this type of system. Back in the ’70s MIT worked on a Lisp machine that led to commercially available systems. If you have an old Apple IIe around you can make it into a Lisp Machine. You can also find LISP in the Internet of Things. And then there is [kremlint] who actually scored an original LISP Machine. We’ll have to keep an eye on his progress in restoring it to working condition.
Thanks for the tip, [krs013].
Although it isn’t official, Ubuntu Core–the tiny Internet of Things version of Ubuntu–now runs on the Raspberry Pi 2. There are prebuilt binaries as well as instructions for how to roll your own, if you prefer. You can even access GPIO
Ubuntu Core abandons the old-style Debian packages, in favor of Snap, a new version of the Ubuntu phone’s Click package manager. Snap offers transactional updates. The idea is that all of these “things” on the IoT need to be updated to patch security holes or fix other issues.
It is funny how many times you use your full-blown PC as a terminal to another computer (which is quite often not as capable as the terminal computer). If all you need is a remote display and keyboard, a Raspberry PI would be enough. One of the newer Pi 2 boards would be even better.
You could roll your own set of remote access software, but you don’t have to. [Gibbio] has already created a thin client image called RPiTC and recently released version 1.4. The build supports diverse remote protocols including Microsoft Remote Desktop, Citrix, VMWare, and even X3270.
It supports WiFi and VPN. We were a little disappointed that it didn’t seem to have any serial communication programs (in case we wanted to build one into an old TeleType case). Of course, it is just a Linux system so you can install anything you want or need.
The nice thing with having a hacker cred is that family and friends are always on the lookout for stuff they think might be useful to you. [Craig Hollabaugh]’s son-in-law found an inspection camera and thought it would be handy for his hobby work. The MagniSight Explorer was first introduced in 2001. It is good for surface mount board work and inspection, except that its analog 480p video is quite dated by today’s standards. So [Craig] upgraded it for crystal clear 1080P/30 video and 5 megapixel images using a $35 Raspberry Pi 2 and a $26 Raspberry Pi Camera Module. After the upgrade, the unit is now a great tool for SMT rework.
There’s not a lot to the upgrade, but [Craig] gives a nice rundown in the 15 minute video of the MagniSight’s internals. He shows us the original analog camera module and its video card, which is able to do some additional processing like black and white output and reverse video (negative). As he mentions, it would be easy for him to do the same via software on the Raspberry Pi. A video camera lens takes care of magnification and two shafts coupled to it via flat belts (rubber bands?) take care of zoom and focus. A front coated mirror angled 45 degrees in front of the lens turns the optical path 90 degrees to allow the lens/camera to “look down”. After experimenting a bit to find the correct focal spot behind the lens unit for the Raspberry Pi camera, he covered the camera module with insulation tape and then just glued it to the old camera mount. After hooking it up to an HDMI monitor, the results are quite nice and he reckons he can easily work with components down to 0402 in size.
He’s got a couple of more upgrades in mind to make the system even better. He plans to replace the existing compact fluorescent lamps with a string of LED’s which will provide more uniform illumination. Plus, he can control their brightness, and selectively turn them on or off to get the optimum lighting. The other interesting upgrade would be to add stepper motors to the X-Y translation stage and automate their movement. After looking up a board file and its BoM, he may even be able to search for a part designator and move the stage to bring the part into focus.