Two shots of the dispenser in question next to each other, showing it from different sides. One is showing the front panel, and the other shot gives us a better look at the top part, with a rotating disk that has openings for treats to be placed in.

Open-Hardware Dog Treat Dispenser Is A Stepping Stone For Behavioral Research

February 6, 2022 by Arya Voronova 12 Comments

The principles of open-source hardware are starting to make great strides in scientific research fields. [Walker Arce] tells us about his paper co-authored with [Jeffrey R. Stevens], about a dog treat dispenser designed with scientific researchers in mind – indispensable for behavior research purposes, and easily reproducible so that our science can be, too. Use of Raspberry Pi, NEMA steppers and a whole lot of 3D printed parts make this build cheap (< $200 USD) and easy to repeat for any experiments involving dogs or other treat-loving animals.

Even if you’re not a scientist, you could always build one for your own pet training purposes – this design is that simple and easy to reproduce! The majority of the parts are hobbyist-grade, and chances are, you can find most of the parts for this around your workshop. Wondering how this dispenser works, and most importantly, if the dogs are satisfied with it? Check out a short demonstration video after the break.

Despite such dispensers being commercially available, having a new kind of dispenser designed and verified is more valuable than you’d expect – authors report that, in their experience, off-the-shelf dispensers have 20-30% error rate while theirs can boast just 4%, and they have test results to back that up. We can’t help but be happy that the better-performing one is available for any of us to build. The GitHub repository has everything you could want – from STLs and PCB files, to a Raspberry Pi SD card image and a 14-page assembly and setup guide PDF.

Open hardware and science are a match made in heaven, even if the relationship is still developing. The Hackaday community has come together to discuss open hardware in science before, and every now and then, open-source scientific equipment graces our pages, just like this recent assortment of biosensing hacks using repurposed consumer-grade equipment.

Continue reading “Open-Hardware Dog Treat Dispenser Is A Stepping Stone For Behavioral Research” →

A 64-Bit Raspberry Pi OS At Last

February 4, 2022 by Jenny List 42 Comments

Long-term Raspberry Pi watchers will have seen a lot of OS upgrades in their time, from the first Debian Squeeze previews through the Raspbian years to the current Raspberry Pi OS. Their latest OS version is something different though, and could be one of the most important releases in the platform’s history so far, as finally there’s an official release of a 64-bit Raspberry Pi OS.

Would-be 64-bit Pi users have of course had the chance to run 64-bit GNU/Linux operating system builds from other distributions for nearly as long as there have been Pi models with 64-bit processors, but until now the official distribution has only been available as a 32-bit build. In their blog post they outline their reasons for this move in terms of compatibility and performance, and indeed we look forward to giving it a try.

Aside from being a more appropriate OS for a 64-bit Pi, this marks an interesting moment for the folks from Cambridge in that it is the first distribution that won’t run on all Pi models. Instead it requires a Pi 3 or better, which is to say the Pi 3, Zero 2 W, Pi 4, Pi 400, and the more powerful Compute Modules. All models with earlier processors including the original Pi, Pi Zero, and we think the dual-core Pi 2 require a 32-bit version, and while the Pi Zero, B+ and A+ featuring the original CPU are still in production this marks an inevitable move to 64-bit in a similar fashion to that experienced by the PC industry a decade or more ago.

As far as we know the Zero is still flying off the shelves, but this move towards an OS that will leave it behind is the expected signal that eventually there will be a Pi line-up without the original chip being present. We’re sure the 32-bit Pi will be supported for years to come, but it should be clear that the Pi’s future lies firmly in the 64-bit arena. They’ve retained their position as the board to watch oddly not by always making the most impressive hardware but by having the most well-supported operating system, and this will help them retain that advantage by ensuring that OS stays relevant.

On the subject of the future course of the Pi ship, our analysis that the Compute Module 4 is their most exciting piece of hardware still stands.

A Portable Projecting Pi For Education

February 2, 2022 by Jenny List 16 Comments

We cover a lot of cyberdeck projects here at Hackaday, custom portable computers often built around the Raspberry Pi. It’s not often that we cover a computer that perfectly achieves and exceeds what a cyberdeck is trying to do without being a cyberdeck in any way, but that’s what [Subir Bhaduri] has done. In addressing the need for Indian schoolchildren to catch up on two years of COVID-disrupted schooling he’s created the pπ, a Raspberry Pi, projector, and keyboard all-in-one computer in a neat sheet-metal case that looks as though it might be just another set of spanners or similar. At a stroke he’s effortlessly achieved the ultimate cyberdeck, because this machine is no sci-fi prop, instead it has a defined use which it fulfills admirably.

All the files to build your own can be found in a GitLab repository. The case is laser-cut sheet metal, and he’s put in a cost breakdown which comes out at a relatively healthy 17200 Indian rupees, or around 230 US dollars. We hope that it serves its purpose well and provides a rugged and reliable teaching aid for a generation from whom COVID has taken so much. You can see more in the video below the break.

Continue reading “A Portable Projecting Pi For Education” →

A pinout diagram of the new Pi 4, showing all the alternate interfaces available.

Did You Know That The Raspberry Pi 4 Has More SPI, I2C, UART Ports?

February 1, 2022 by Arya Voronova 35 Comments

We’ve gotten used to the GPIO-available functions of Raspberry Pi computers remaining largely the same over the years, which is why it might have flown a little bit under the radar: the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections wired to a single pin you can carve out a pretty powerful combination of peripherals for your next robotics, automation or cat herding project.

The datasheet for these peripherals is pleasant to go through, with all the register maps nicely laid out – even if you don’t plan to work with the register mappings yourself, the maintainers of your preferred hardware enablement libraries will have an easier time! And, of course, these peripherals are present on the Compute Module 4, too. It might feel like such a deluge of interfaces is excessive, however, it lets you achieve some pretty cool stuff that wouldn’t be possible otherwise.

Having multiple I2C interfaces helps deal with various I2C-specific problems, such as address conflicts, throughput issues, and mixing devices that support different maximum speeds, which means you no longer need fancy mux chips to run five low-resolution Melexis thermal camera sensors at once. (Oh, and the I2C clock stretching bug has been fixed!) SPI interfaces are used for devices with high bandwidth, and with a few separate SPI ports, you could run multiple relatively high-resolution displays at once, No-Nixie Nixie clock style.

As for UARTs, the Raspberry Pi’s one-and-a-half UART interface has long been an issue in robotics and home automation applications. With a slew of devices like radio receivers/transmitters, LIDARs and resilient RS485 multi-drop interfaces available in UART form, it’s nice that you no longer have to sacrifice Bluetooth or a debug console to get some fancy sensors wired up to your robot’s brain. You can enable up to six UARTs. Continue reading “Did You Know That The Raspberry Pi 4 Has More SPI, I2C, UART Ports?” →

ESP32 And Raspberry Pi Take Over Game Boy LCD

January 30, 2022 by Tom Nardi No comments

The Nintendo Game Boy and its many permutations represent one of the most well-known and successful gaming platforms ever produced. There was a decades-long stretch of time where the most popular kid in the lunch room was the one who brought in their Game Boy so the rest of the class could huddle around and check out the latest Pokemon title.

But those days are long gone, and now these once-coveted handhelds can be had for a song on the second-hand market. Which makes it the perfect time to check out this project [kgsws] released recently that allows you to interface the Game Boy LCD with the ESP32 or the Raspberry Pi. In the most basic of applications, it lets you push video from your Linux computer out to the Game Boy LCD over WiFi. But as the video below illustrates, that’s just the tip of the iceberg.

With the ESP32 wired between the handheld’s LCD and main PCB, the microcontroller can also act as a capture device using I2S camera mode. Compared to what ends up showing on the handheld’s LCD, the recorded gameplay [kgsws] shows off looks fantastic. Visuals are crisp and fluid, and naturally devoid of the Game Boy’s iconic (if slightly nauseating) greenish tint.

The project also includes the capability to control an array of Game Boy LCDs, which allows for some interesting possibilities. The image can be stretched to cover multiple displays, which [kgsws] demonstrates by playing a game on 3 x 3 grid of salvaged panels, but each LCD also can be controlled individually as is the case with the large digital clock seen above.

Whether you’re looking for a way to capture gameplay on the real hardware, or want to run RetroPie on a real Game Boy screen, we’re excited to see what folks come up with using this project.

Continue reading “ESP32 And Raspberry Pi Take Over Game Boy LCD” →

Sending Pics To Grandma, No Smartphone Needed

January 21, 2022 by Lewin Day 32 Comments

When it comes to keeping in touch with the grandparents, a lack of familiarity with modern technology can get in the way. [palmerabollo] wanted to share photos with his grandmother, but found that it was difficult as she didn’t have a smartphone or an Internet connection to receive photos. Thus, a custom build for grandma was in order! (translated)

To minimise maintenance requirements, the build relies on a thermal receipt printer. Each roll of thermal paper is good for printing off about 150 images before needing a change, so it’s a low-cost, fuss-free solution with no need for ink changeovers.

A Raspberry Pi Zero 2W runs the show, paired with a HAT that provides cellular internet connectivity. Photos are sent over Telegram with some custom Python code that [palmerabollo] put together. The system uses the Python “thermalprinter” library, with the Floyd-Steinberg dithering algorithm baked in allowing nice quality even on the simple thermal printer.

It’s a fun build, and lets [palmerabollo] send his grandmother fun photos and messages without requiring any effort on her part. It’s super cute to see the photos stuck up on the refrigerator, too.

There’s plenty of fun to be had with thermal printers, so don’t be afraid to get stuck in yourself! Video after the break. Continue reading “Sending Pics To Grandma, No Smartphone Needed” →

This End Times Cyberdeck Is Apocalypse-Ready

January 21, 2022 by Dan Maloney 29 Comments

In the cyberdeck world, some designs are meant to evoke a cyberpunk vibe, an aesthetic that’s more lighthearted than serious. Some cyberdecks, though, are a little more serious about hardening their designs against adverse conditions. That’s where something like the ARK-io SurvivalDeck comes into play.

Granted, there does seem to be at least a little lightheartedness at play with the aptly named [techno-recluse]’s design. It’s intended to be an “Apocalypse Repository of Knowledge”, which may be stretching the point a bit. But it does contain an impressive amount of tech — wide-band software defined radio (SDR) covering HF to UHF, GPS module, a sensor for air pressure, temperature, and humidity, and a Raspberry Pi 3B running Kali Linux. Everything is housed in a waterproof ammo can; a 3D printed bezel holds an LCD touchscreen and a satisfying array of controls, displays and ports. The lid of the ammo can holds a keyboard, which was either custom-made to precisely fit the lid or was an incredibly lucky find.

There’s a lot to like about this build, but our favorite part is the external dipole for receiving NOAA weather satellite imagery. The ability to monitor everything from the ham bands to local public service channels is a nice touch too. And we have no complaints about the aesthetics or build quality either. This reminds us of an earlier cyberdeck with a similar vibe, but with a more civilian flavor.

Thanks to [Kate] for the tip.

[via Tom’s Hardware]