A Simple Guide To Cams

May 31, 2023 by Danie Conradie 10 Comments

With the availability of precision controllable actuators, it’s easy to overlook the simple but versatile mechanisms that got us here. In the video after the break, [Teaching Tech] explores the basics of cams and how to use them in your projects.

Cams are used to convert rotation into linear motion, and are probably best known for their use in engines and locking mechanisms. [Teaching Tech] first goes over the basic design and terminology in CAD, and demonstrates it’s use with a cam follower, locking mechanism, cam plate, and a knob that snaps to predefined positions. Of course a cam shape is not limited to a single lobe, but can have multiple lobes of various heights to create different motion patterns.

Cams are especially useful when you need to operate multiple mechanisms from a single input drive, as [Teaching Tech] demonstrates with the 3D printed automaton of a polar bear attempting to swipe a seal. We’ve also seen cams on a mechanical 7-segment display, and they were used to safely fire machine guns through aircraft propellers up to the 1950’s.

So next time you’re thinking adding another actuator to a project, take a moment to consider if a cheap and simple cam could do the job.

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Neural Network Helps With Radar Pipeline Diagnostics

May 31, 2023 by Lewin Day 3 Comments

Diagnosing pipeline problems is important in industry to avoid costly or dangerous failures from cracked, broken, or damaged pipes. [Kutluhan Aktar] has built an system that uses AI to assist in this difficult task.

The core of the system is a MR60BHA1 60 GHz mmWave radar module, which is most typically used for breathing and heartrate detection. Here, it’s repurposed to detect fluctuating vibrations as a sign that a pipeline may be cracked or damaged. It’s paired with an Arduino Nicla Vision module, with the smart camera able to run a neural network model on the captured radar data to flag potential pipe defects and photograph them. The various modules are assembled on a PCB resembling Dragonite, the Dragon/Flying-type Pokemon.

[Kutluhan] walks us through the whole development process, including the creation of a web interface for the system. Of particular interest is the way the neural network was trained on real defect models that [Kutluhan] built using PVC pipe. We’ve looked at industrial pipelines in detail before, too. Video after the break.

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More Ideas For Setting Up An Electronics Workbench

May 31, 2023 by Dave Rowntree 37 Comments

Setting up an electronics work area is a highly personal and situational affair, with many interesting problems to be solved, and for many of us, significant budget constraints. The requirements for electronics development vary wildly depending upon the sort of work to be undertaken, but there is core equipment that many of us would consider a bare minimum for usability. [Badar Jahangir Kayani] is at the start of his career as an electrical engineer, and has documented the kitting out of his personal work areas for others to learn from.

A place for everything, everything in its place

As we already touched upon, the cost is often the main driving factor determining what we end up with, and this cost-vs-performance/quality tradeoff is what makes some of us fret over a buying decision. Buying secondhand off eBay is an option, but a lack of warranty and the unknowable condition are not great selling points.

[Badar] has a good grasp of the basic concepts of usability, such as keeping the most frequently used tools, instruments, and components out in the open. Less frequently used stuff is stored in drawers, bins, and compartment boxes. Buying the same storage systems keeps things as consistent as much as possible since it makes storing them easier. We were particularly interested in the use of the cloud-based database solution, Airtable used to create a parts database for minimal outlay.

There is also a lot of detail about how to walk that cost/quality/performance tightrope and get the best-valued gear currently on the market. Some notable examples are the UNI-T UT61E Digital Multimeter for general test use, the Controleo3 reflow controller for SMT assembly, and the Omnifixo OF-M4 magnetic fixament kit for that fiddly wiring part. [Badar] also recommends the FumeClear Solder Fume Extractor, although they lament that particular bit of kit is still under evaluation.

Obviously, we’ve talked about work areas a lot on these pages, like this time. For those with more space, this flippin’ awesome bench will be of interest, and if space is tight (or travel is a regular thing) might we suggest this 3D printed DIN-rail mounting cube as a starting point?

Can Hobbyists Bring SGI’s IRIX OS Back To Life?

May 31, 2023 by Lewin Day 29 Comments

Irix was the operating system developed by Silicon Graphics from 1988 to 1998. The OS supported the company’s high-end workstations and served in many serious roles. The company cut off support for the UNIX-based OS in 2006, but now a diehard community is looking to bring the ancient codebase back to life.

SGI workstations used to cost big money before the company collapsed. It failed to make the leap to a new era when x86 architecture began to dominate the wider computing industry. Credit: Bruno Cordioli, CC-BY-2.0

While SGI’s workstations once sold for five or six figures, surviving examples can now often be had for just a few hundred dollars on eBay. The MIPS-based hardware was potent for its time, often used for 3D rendering work for video games, films, or for scientific purposes. IRIX was SGI’s own OS built specifically to support these use cases.

The IRIX Network is a hobbyist community that loves these old machines and their software. The group hopes to raise $6,500 through crowdfunding to reverse-engineer IRIX. The hope is to use those learnings to create an open-source derivative version named IRIX-32, based on IRIX 5.3, the last 32-bit version of the OS.

It’s a monumental task, but admirable nonetheless. Whether we one day see IRIX reborn, akin to what happened to AmigaOS, remains to be seen.

Hackaday Prize 2023: Low Cost Braille Embosser From 3D Printer Parts

May 31, 2023 by Danie Conradie 8 Comments

The limited availability of texts transcribed to Braille and the required embossing equipment is a challenge world wide, but especially in poorer countries. To alleviate this problem, a team makers from in Cameroon have been developing BrailleRAP, an open source Braille embosser.

BrailleRAP is built built using commonly available 3D printer components, printed parts, and a laser-cut acrylic or wood frame. Paper is fed between a pair of carriages, the bottom one punching dots with a solenoid while the other acts as the anvil. Sheets of paper are fed in one or two at a time with stepper controlled rollers to control the position. At a cost of about $250, it is about a tenth of the price of the cheapest commercial solution, and the team have created excellent documentation so anyone can build it.

BrailleRAP was inspired by BRAIGO, another Hackaday-featured embosser assembled LEGO Mindstorm parts. We also featured another simple, but ingenious handheld embosser for portable use.

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Hackaday Prize 2023: This Challenge Makes It So Easy Being Green

May 31, 2023 by Elliot Williams 2 Comments

This year’s Hackaday Prize is our first nice round number – number ten! We thought it would be great to look back on the history of the Prize and cherry-pick our favorite themes from the past. Last year’s entire theme was sustainable hacking, and we challenged you to come up with ways to generate or save power, keep existing gear out of the landfill, find clever ways to encourage recycling or build devices to monitor the environment and keep communities safer during weather disasters, and you all came through. Now we’re asking you to do it again.

There are hundreds of ways that we can all go a little bit lighter on this planet, and our Green Hacks Challenge encourages you to make them real. Whether you want to focus on clean energy, smarter recycling, preventing waste, or even cleaning up the messes that we leave behind, every drop of oil left unburned or gadget kept out of the landfill helps keep our world running a little cleaner. Here’s your chance to hack for the planet.

Inspiration

One thing we really loved about last year’s Green Hacks was that it encouraged people to think outside the box. For instance, we got some solar power projects as you’d expect, but we also got a few really interesting wind power entries, ranging from the superbly polished 3D Printed Portable Wind Turbine that won the Grand Prize to the experimental kite turbine in Energy Independence While Travelling, to say nothing of the offbeat research project toward making a Moss Microbial Fuel Cell.

3D Printed Portable Wind Turbine

Moss Microbial Fuel Cell

Energy Independence While Travelling

Plastic was also in the air last year, as we saw a number of projects to reuse and recycle this abundant element of our waste stream. From a Plastic Scanner that uses simple spectroscopy to determine what type of plastic you’re looking at, to filament recyclers and trash-based 3D printers to make use of shredded plastic chips.

Polyformer

The Trash Printer – Version 3

Plastic Scanner

Finally, you all really put the science into citizen science with projects like OpenDendrometer that helps monitor a single tree’s health, and the Crop Water Stress Sensor that does the same for a whole field. Bees didn’t get left out of the data collection party either, with the Beehive Monitoring and Tracking project. And [Andrew Thaler]’s tremendously practical Ocean Sensing for Everyone: The OpenCTD brought the basics of oceanic environmental monitoring down to an affordable level.

OpenDendrometer

Crop Water Stress Sensor

Beehive Monitoring and Tracking

Ocean Sensing for Everyone: The OpenCTD

Now It’s Your Turn to be Green

If any of the above resonates with your project goals, it’s time to put them into action! Start up a new project over on Hackaday.io, enter it into the Prize, and you’re on your way. Ten finalists will receive $500 and be eligible to win the Grand Prizes ranging from $5,000 to $50,000. But you’ve only got until Tuesday, July 4th to enter, so don’t sleep.

As always, we’d like to thank our sponsors in the Hackaday Prize, Supplyframe and DigiKey, but we’d also like to thank Protolabs for sponsoring the Green Hacks challenge specifically, and for donating a $5,000 manufacturing grant for one finalist. Maybe that could be you?

Moon Phase Lamp Uses Rotating Shade

May 31, 2023 by Lewin Day 9 Comments

The Moon has fascinated humanity for centuries. These days, though, it’s a trial and a bore to go outside and stare upwards to check on the natural satellite. Instead, why not bring the Moon to your bedside with this rotating phase lamp?

The build comes to us from [payasa_manandhar], who did a good job of replicating the Moon in both form and function. It’s based around a lithophane of the lunar surface, which adequately duplicates the Moon’s grey pockmarked visage thanks to topographical data sourced from NASA. It looks a treat when backlit from the inside. However, this is no mere ornamental lamp. With the aid of a stepper motor controlled by an Arduino, a shade inside the lamp actually rotates to shadow the Moon as per the appropriate phase.

It’s a build that is both fun and educational, in both the electronic and astronomical disciplines. We’ve seen some other great Moon lamps before, too.