Hackaday X Tindie Meetup In Dublin This Friday

April 3, 2018 by Jenny List 4 Comments

Hackaday and Tindie are coming to Dublin at the end of this week. Join us on Friday night as we host a meetup in the company of our friends at TOG hackerspace. Please RSVP to tell us you’re coming.

This is a Bring-a-Hack style event, so come out for a casual meetup and bring a project to show off. It’s a great way to get conversation started and often the most amazing projects are the ones whose creators imagine them to be inconsequential. Keep them to a manageable size though, space may be at a premium.

We’ll supply beverages and light snacks to oil the wheels, and Hackaday Editors [Mike Szczys] and [Jenny List], Tindie Product Manager [Jasmie Brackett], and SupplyFrame Product Manager [Sophi Kravitz] will be on hand. It doesn’t matter what it is you’ve got to show us, whatever you have we’d love to see it. Thank you to TOG for opening their doors to this event!

Saturday is the Hackaday Dublin Unconference!

Act fast to grab one of the last five tickets to the Hackaday Dublin Unconference this Saturday. All tickets have been sold out, but a few people who had a ticket but are now unable to attend were nice enough to return them so that someone else may take their place. Everyone one who attends should be ready to give a 7-minute talk on what they’re excited about right now. We can’t get through everyone in one day so don’t worry if public speaking mortifies you (but still come prepared). We’ll do our best to get through a ton of presenters. We’ll have food and drink on hand and head to the pub afterward for those still standing that evening! Need proof that this is not to be missed? We did it in London last September and it was epic!

This is Hackaday’s first visit en masse to the Irish capital, and we’re looking forward to correcting that oversight and meeting the masses of our Irish readership. Thanks to the generous support of DesignSpark, the innovation arm of RS Components and the exclusive sponsor of the event, we hare happy to offer Hackaday Dublin Unconference free of charge to all who attend.

We’re excited about what will come from this weekend and are looking forward to it. See you soon!

[Ben Krasnow] Tests Novel Plasma

April 3, 2018 by Steven Dufresne 18 Comments

When [Ben Krasnow] sees an interesting phenomenon he pursues it with a true scientist’s mentality, though it doesn’t hurt that he also has the skills and the workshop. This time he’s produced a glowing plasma by impacting fused quartz and other materials with a high-speed water jet.

The jet of pure water emerges from a 0.004″, or 100 micron, diameter sapphire orifice with a flow rate of around 2 milliliters per second giving a speed of 240 meters per second. It collides at 90° with a dielectric material where the plasma is produced as a toroid surrounding the collision point.

There’s been very little research into the phenomena but a proposal from one research paper which [Ben] found is that the plasma is a result of charging due to the triboelectric effect. This is the same effect which charges a balloon when you rub it against your hair, except that here there are water molecules running across a clear dielectric such as fused quartz. This effect results in a positively charged anode downstream of the collision while the water near the point of highest shear becomes conductive and conducts negative charge to the point of smallest curvature, producing a cathode. The electric field at the small-radius cathode acts like a short point with a high voltage on it, ionizing the air and forming the plasma. If this form of ionization sounds familiar, that’s because we’ve talked it occurring between the sharp wire and rounded foil skirt of a flying lifter.

[Ben] found support for the triboelectric theory when he substituted oil for the water. This didn’t produce any plasma, which is be expected since unlike water, oil is a non-polar molecule. However, while the researchers tried just a few dielectric materials, [Ben] had success with every transparent dielectric which he tried, including fused quartz, lithium niobate, glass, polycarbonate, and acrylic, some of which are very triboelectrically different from each other. So there’s room here for more theorizing. But check out his full video showing his equipment for producing the waterjet as well as his demonstrations and explanation.

Continue reading “[Ben Krasnow] Tests Novel Plasma” →

It Looks Like A Nintendo, But It’s Running A Pi: A Gamer’s Long-Sought Dream Handheld

April 2, 2018 by James Hobson 6 Comments

[Christopher Foote] didn’t play quite as many games as he wanted to as a child. After years of catching up using the RetroPie and the PiGRRL 2, it was when he first picked up a Switch’s joy-cons that inspiration struck. Behold: the PiSwitch!

Realizing they operated on Bluetooth tech, [Foote] spent a fair chunk of time getting the joy-cons to properly pair to the Raspberry Pi 3 and function as one controller. Once done, he relied on Linux Joystick Mapper to manage the keybindings with some extra legwork besides to get the analog sticks working properly.

To make this console mobile, he’s packed a 6600mAh battery and Adafruit Powerboost 1000c into the device, added a second headphone jack and speaker for commuting and home enjoyment, and a Pi V2 camera module. A 3D printed case, encapsulating these components and a seven-inch touchscreen, also allows the joy-cons to be detached — though he plans on updating its design in the future.

The PiSwitch boots into a custom UI that lets you select different services — RetroPie, Kodi, Debian, and the terminal — while the joy-cons seamlessly function together or individually regardless of the activity. Check out the quick intro tour for this project after the break!

Continue reading “It Looks Like A Nintendo, But It’s Running A Pi: A Gamer’s Long-Sought Dream Handheld” →

Emboss Your Own Seals With A Laser Cutter

April 2, 2018 by Sonya Vasquez 6 Comments

Parchment might be a thing of the past, but for those of us who still use paper an embossed seal can give everything from your official documents to your love letters a bold new feeling of authenticity. As far as getting your own seals made, plenty of folks will settle for having a 3rd party make them a seal, but not us. [Jason] shows us just how simple it is to raster our own seals with a laser cutter.

As far as the process goes, there are no tricks outside the typical workflow for raster engraving. Here, [Jason] simply creates a positive and (mirrored) negative seal pattern for each side of the seal embosser. The pattern is set for raster engraving, and the notched outline will be vector cut. From here, he simply exports the design, and the laser handles the rest.

This hack turned out so cleanly it almost seems like it could got into professional use–and it already is! Some extra Google-fu told us that it’s actually a fairly standard technique across the embossing industry for making embossing seals. Nevertheless, we couldn’t share our excitement for just how accessible this technique can be to anyone within reach of some time on a laser cutter.

[Jason] is using Delrin as his material to capture the design, which cuts cleanly and nicely handles the stress of being squished against your legal documents a couple hundred times. We’ve had our fair share of love on these pages for this engineering plastic. If you’re looking to get a closer look at this material, have a go at our materials-to-know debrief and then get yourself equipped with some design principles so that you’re ready to throw dozens of designs at it.

It’s not the first time the crafting and hacking communities intermingle and start sharing tools. In fact, if you’ve got yourself a vinyl cutter kicking around, why not have a go at churning out a few pcb stencils?

Thanks for the tip, [Doug]!

Continue reading “Emboss Your Own Seals With A Laser Cutter” →

From Plastic Bottle To Plastic Brush

April 2, 2018 by Kristina Panos 8 Comments

We first saw someone turn a plastic bottle into plastic ribbon about four years ago. Since then, we’ve wondered what this abundant, sturdy material could be used for besides just tying things together.

[Waldemar Sha] has answered that question with his excellent brush made from scrap wood and plastic bottle rope. Turning seven 1-litre bottles into curly bristle fodder was easy enough, but they have to be straight to brush effectively. No problem for [Waldemar]. He wound it all up on a spinning homemade jig that’s anchored in a bench vise. The jig is designed to slide into a small electric sandwich grill he had lying around, and he just flips it after a while so the rope straightens evenly.

We really like the way he secured the bristles into the brush base. After drilling the holes, he sawed lengthwise channels that are deep enough for a bamboo skewer. Each group of bristles is hung over the skewer and down through the hole, and everything is glued in place before the handle is added. Sweep past the break to watch him tidy his workbench, and then learn how to make your own plastic rope.

Is there a better use of recycled plastic than making tools? Check out this joiner’s mallet made from milk jugs. Continue reading “From Plastic Bottle To Plastic Brush” →

Giant F1 Car Is 3D Printed And Radio Controlled

April 2, 2018 by Lewin Day 16 Comments

The OpenRC F1 car is a radio control car you can 3D print and assemble yourself. You make the parts, glue them together, and then add your RC gear. That’s all well and good, but could it be done… bigger? [3D Printing Nerd] decided to tackle this one at 4x scale.

It goes without saying that this took some work. The model has to be carved up into sections that would actually fit on the printers to hand. This can take some planning to ensure the parts still come out nicely, as they may be printed in different orientations or with different slicer settings than originally intended.

That’s just the start, though. Once they’re printed, the parts need to be accurately aligned and glued together, which is a whole extra set of challenges. Urethane, epoxy and superglue adhesives are all pressed into service here to get the job done.

It’s a multipart build, as it’s a huge undertaking to 3D print anything on this scale. It’s a great example of taking a fun project, and turning up the silly factor to 11. And of course, at the end of the day, you’ve got a gigantic RC car to play with. Perhaps the only bigger RC cars we’ve seen have been… actual cars.

A Well-Chronicled Adventure In Tiny Robotics

April 2, 2018 by Roger Cheng 6 Comments

Some of us get into robotics dreaming of big heavy metal, some of us go in the opposite direction to build tiny robots scurrying around our tabletops. Our Hackaday.io community has no shortage of robots both big and small, each an expression of its maker’s ideals. For 2018 Hackaday Prize, [Bill Weiler] entered his vision in the form of Project Johnson Tiny Robot.

[Bill] is well aware of the challenges presented by working at a scale this small. (If he wasn’t before, he certainly is now…) Forging ahead with his ideas on how to build a tiny robot, and it’ll be interesting to see how they pan out. Though no matter the results, he has already earned our praise for setting aside the time to document his progress in detail and share his experience with the community. We can all follow along with his discoveries, disappointments, and triumphs. Learning about durometer scale in the context of rubber-band tires. Exploring features and limitations of Bluetooth hardware and writing code for said hardware. Debugging problems in the circuit board. And of course the best part – seeing prototypes assembled and running around!

As of this writing, [Bill] had just completed assembly of his V2 prototype which highlighted some issues for further development. Given his trend of documenting and sharing, soon we’ll be able to read about diagnosing the problems and how they’ll be addressed. It’s great to have a thoroughly documented project and we warmly welcome his robot to the ranks of cool tiny robots of Hackaday.io.