Does the complexity of modern computing ever get you down? Do you find yourself longing for the old days, where you could actually understand what your desktop machine’s hardware and software was doing at any given moment? You aren’t alone, but unfortunately running a 40+ year old computer as your daily driver isn’t really a viable option.
But that doesn’t mean you don’t have options. [Kostas] writes in to tell us about the “CB2 micro”: a diminutive open source retrocomputer kit that can be built in as little as 30 minutes thanks to its through-hole construction and exceptionally low parts count. When completed the miniature computer is an all-in-one BASIC development platform; just connect up a display and a PS/2 keyboard, and you’ve got everything you need to write you own programs or run games and applications developed by the community. You don’t even need a floppy, as the ATmega644P powered board has enough internal flash to store eight programs for easy access through its graphical menu system.
For many in the audience, a cheap little board that you can assemble yourself and use as a stand-alone BASIC experimentation platform is appealing enough. But thanks to a collection of hardware add-on boards, the CB2 micro can be augmented with some interesting capabilities.
Some are fairly obvious such as adding additional flash storage or RAM, but you can also run the computer on AA or AAA batteries, or add an S-Video port. [Kostas] even explains how to assemble a special serial cable that allows you to network multiple boards together. If you take the plunge and start building your own hardware modules, the sky’s the limit.
Two engineering students are hard at work on this air drum which they hope will help disabled people and people in nursing homes. Though, we think it just looks fun!
Each board is its own module consisting of the electronics and 3D printed cases. The modules each contain an arduino mini, IR sensor, and LEDs. They share power, audio, and communicate with an i2c bus. Two modules are special, one holds the power system and the other a Raspberry Pi. The units can be put together in different configurations. Finally, they are capped with speaker units.
The demo shown in the video, which you can see after the break, looks fun. The response time is pretty fast and it looks like you can measure all sorts of parameters. This can then be translated into different velocities, pitches, and instruments. It’s somewhere between a theremin and a drum kit, very cool.
As the name implies, the OSEP STEM board is an embedded project board primarily aimed at education. You use jumper wires to connect components and a visual block coding language to make it go.
I have fond memories of kits from companies like Radio Shack that had dozens of parts on a board, with spring terminals to connect them with jumper wires. Advertised with clickbait titles like “200 in 1”, you’d get a book showing how to wire the parts to make a radio, or an alarm, or a light blinker, or whatever.
The STEM Kit 1 is sort of a modern arduino-powered version of these kits. The board hosts a stand-alone Arduino UNO clone (included with the kit) and also has a host of things you might want to hook to it. Things like the speakers and stepper motors have drivers on board so you can easily drive them from the arduino. You get a bunch of jumper wires to make the connections, too. Most things that need to be connected to something permanently (like ground) are prewired on the PCB. The other connections use a single pin. You can see this arrangement with the three rotary pots which have a single pin next to the label (“POT1”, etc.).
I’m a sucker for a sale, so when I saw a local store had OSEPP’s STEM board for about $30, I had to pick one up. The suggested price for these boards is $150, but most of the time I see them listed for about $100. At the deeply discounted price I couldn’t resist checking it out.
So does an embedded many-in-one project kit like this one live up to that legacy? I spent some time with the board. Bottom line, if you can find a deal on the price I think it’s worth it. At full price, perhaps not. Join me after the break as I walk through what the OSEPP has to offer.
If you grew up in the latter part of the 20th century, you didn’t have the Internet we have today — or maybe not at all. What you did have, though, was Radio Shack within an hour’s drive. They sold consumer electronics, of course, but they also sold parts and kits. In addition to specific kits, they always had some versions of a universal kit where lots of components were mounted on a board and you could easily connect and disconnect them to build different things. [RetoSpector78] found a 200-in-1 kit at a thrift store that was exactly like the one he had as a kid and he shares it with us in the video below.
This was a particularly fancy model since it has a nice looking front panel with a few knobs and displays. The book shows you how to make the 200 different projects ranging from metronomes to rain detectors. The projects really fell into several categories. There were practical circuits like radio receivers, test equipment, and transmitters. Then there were games or circuits even the manual called “silly.” In addition, there were circuits to build simply to understand how they work, like flip flops or counters.
If you are under a certain age, you probably associate Radio Shack with cellphones. While Radio Shack never gave us access to the variety and economy of parts we have today, they did have one thing that I wish we could get again: P-Box kits. The obvious questions are: What’s a P-Box and why do I want one? But the kit wasn’t to make a P-Box. P-Box was the kind of box the kit came in. It was like a piece of perfboard, but made of plastic, built into a plastic box. So you bought the kit — which might be a radio or a metal detector — opened the box and then built the kit using the box as the chassis.
The perfboard was pretty coarse, too, because the components were all big discrete components. There was at least one that had an IC, but that came premounted on a PC board that you treated like a big component. One of my favorites was a three-transistor regenerative shortwave receiver. In those days, you could pick up a lot of stations on shortwave and it was one of the best ways at the time to learn more about the world.
On the left, you can see a picture of the radio from the 1975 catalog. You might think $7.95 is crazy cheap, but that was at least a tank full of gas or four movie tickets in those days, and most of us didn’t have a lot of money as kids, so you probably saved your allowance for a few weeks, did chores, or delivered papers to make $8.
The concept of creating a gaming portable out of a home console has been around for some time, but it’s hardly seen the other way around. There have been a few devices that dared to straddle the line (i.e., Sega Nomad, Nintendo Switch, etc.), but the two worlds typically remain separate. [Stephen] looked to explore that space by attempting to turn the Game Boy Advance into a “big boy” console. The FPGA-based mod kit he created does just that, and comes complete with controller support and digital video output in 720p over a mini HDMI cable.
The kit itself was designed specifically for the original model GBAs containing the 40-pin LCD ribbon cable. These original models were the early run of non-backlit screens that are also denoted by a motherboard designation that can be seen by peering into the battery compartment. RGB signals are read directly from the GBA LCD socket by removing the handheld’s screen in favor of a fresh flat flex ribbon cable. This method enables a noise-free digital-to-digital solution as opposed to the digital-to-analog output of Nintendo’s own Game Boy Player add-on for the GameCube.
At an astonishing 240×160 native resolution, GBA video is scaled by the FPGA up to 5x within a 720p frame. Of course some of the image is cutoff in the process, so options for 4x and 4.5x scales were included. As a wise man once said, “Leave no pixel behind”. Since Nintendo designed the GBA clock to run at 59.7276 Hz, [Stephen] removed the oscillator crystal in order to sync the refresh rate to a more HDMI friendly 60 Hz. This means that the mod kit overclocks GBA games ever so slightly, though [Stephen] included a GBA cycle accurate mode as an option if your display can handle it.
The video below is [Stephen]’s initial test using a SNES controller. Tests must have gone well, because he decided to incorporate a SNES controller port in the final design. Now all those Super Nintendo ports on the GBA are back home once again thanks to this “consolizer” kit.
The Prusa i3 MK3 is, for lack of a better word, inescapable. Nearly every hacker or tech event that I’ve attended in 2018 has had dozens of them humming away, and you won’t get long looking up 3D printing on YouTube or discussion forums without somebody singing its praises. Demand for Prusa’s latest i3 printer is so high that there’s a literal waiting list to get one.
At the time of this writing, over a year after the printer was officially put up for sale, there’s still nearly a month lead time on the assembled version. Even longer if you want to wait on the upgraded powder coated bed, which has unfortunately turned out to be a considerable production bottleneck. But the team has finally caught up enough that the kit version of the printer (minus the powder coated bed) is currently in stock and shipping next day.
I thought this was a good a time as any to pull the trigger on the kit and see for myself what all the excitement is about. Now that I’ve had the Prusa i3 MK3 up and running for a couple of weeks, I can say with confidence that it’s not just hype. It isn’t a revolution in desktop 3D printing, but it’s absolutely an evolution, and almost certainly represents the shape of things to come for the next few years.
That said, it isn’t perfect. There’s still a few elements of the design that left me scratching my head a bit, and some parts of the assembly weren’t quite as smooth as the rest. I’ve put together some of those observations below. This isn’t meant to be a review of the Prusa i3 MK3 printer, there’s more than enough of those already, but hopefully these assorted notes may be of use to anyone thinking of jumping on the Prusa bandwagon now that production has started really ramping up.