Look Ma, No Support For My Floating Holes!

May 17, 2020 by 21 Comments

Do you find supports to be annoying, when you use a 3D printer? A lot of time breaking away surplus pieces of plastic and then cleaning up the resulting ragged edges on your prints is certainly an unwelcome chore. But printing in free space is beyond the capabilities of even the most expensive printer, so it seems we’re stuck with supports for the foreseeable future. [Adam Haile] may have a solution to some support woes though, in the form of a clever technique for printing inset holes without support. His designs have a significant quantity of screw holes with inset heads, too far for the printer to bridge over so his technique breaks down the bridge into manageable smaller distances.

In the video below the break he shows how its done, with successive single layers that contain polygons bridging chords across the circle, with each layer approximating further to the final hole and the last holding the hole itself. Over a few layers the hole is created, without any support but with the minor inconvenience of a not perfectly flat inset. It’s a very clever idea, and one that we’d be interested to see further expanded upon by others.

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60’s Natural Gas Pipeline Computer Retires To Play Games

May 17, 2020 by 33 Comments

Computer gaming has come a very long way since the 1960s. While computers of that era may not run Doom or anything even close to it, many of us had our first exposure to computers playing Hunt the Wumpus, Adventure, or Star Trek over a clackety old TeleType machine. If you missed those days, or if you simply miss them, you might enjoy the video from [somecomputerguy] who fires up an old retired gas pipeline computer and loads enough paper tape into it to play Lunar Lander. (Video embedded below.)

We don’t miss the days of toggling in a bootloader so you could load the paper tape for a second bootloader before you could enter the actual program you wanted to run.

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Mitigating Con Deprivation: Disobey 2020

May 17, 2020 by 6 Comments

While the Coronavirus-induced lockdown surely makes life easier for the socially anxious and awkward ones among us, it also takes away the one thing that provides a feeling of belonging and home: conferences. Luckily, there are plenty of videos of past events available online, helping to bypass the time until we can mingle among like-minded folks again. To put one additional option on the list, one event you probably never even heard of is Disobey, Finland’s annual security conference that took place for its fifth time in Helsinki earlier this year, and they recently published the playlist of this year’s talks on their YouTube channel.

With slightly under 1500 hackers, makers, and generally curious people attending this year, Disobey is still on the smaller side of conferences, but comes with everything you’d expect: talks, workshops, CTF challenges, and a puzzle-ridden badge. Labeling itself as “The Nordic Security Event”, its main focus is indeed on computer and network security, and most of the talks are presented by professional security researchers, oftentimes Red Teamers, telling about some of their real-world work.

In general, every talk that teaches something new, discusses important matters, or simply provides food for thought and new insight is worth watching, but we also don’t want to give everything away here either. The conference’s program page offers some outline of all the talks if you want to check some more information up front. But still, we can’t just mention a random conference and not give at least some examples with few details on what to expect from it either, so let’s do that.

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Force Feedback Mouse Really Shakes Things Up

May 17, 2020 by 21 Comments

This is a very exciting time for those who like to spend their downtime exploring virtual worlds. The graphics in some big-budget titles are easily approaching photorealism, and immersive multi-channel sound can really make you believe you’ve been transported to another place or time. With another generation or two of GPU development and VR hardware, the line between gaming and reality is bound to get awful blurry.

That said, we’re still a far way off from the holodeck aboard the Enterprise. A high-end PC and the latest in VR can fool your eyes and ears, but that still leaves your other senses out of the fun. That’s why [Jatin Patel] has developed this clever force-feedback mouse using an array of solenoids.

The idea is pretty simple: a Python program on the computer listens for mouse click events, and tells an attached Arduino to fire off the solenoids when the player pulls the virtual trigger. It’s naturally not a perfect system, as it would seem that clicking in the game’s menus would also start your “gun” firing. But as you can see in the video after the break, when it works, it works very well. The moving solenoids don’t just vibrate the mouse around, the metallic clacking actually accentuates the gun sound effects from the game.

With this kind of tactile feedback and an omnidirectional treadmill to keep us moving, we’d be pretty close to fooling our senses into thinking we’re actually somewhere else. Which frankly, sounds quite appealing right about now.

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Building D-O, The Cone Face Droid

May 17, 2020 by 10 Comments

For many of us, movies are a great source of inspiration for projects, and the Star Wars films are a gift that just keeps giving. The D-O droid featured and the Rise of Skywalker is the equivalent of an abandoned puppy, and with the help of 3D printing, [Matt Denton] has brought it to life. (Video, embedded below.)

D-O is effectively a two-wheeled self-balancing robot, with two thin drive wheels on the outer edges of the main body. A wide flexible tire covers the space between the two wheels, where the electronics are housed, without actually forming part of the drive mechanism. The main drive motors are a pair of geared DC motors with encoders to allow closed-loop control down to very slow speeds. The brains of the operation is an Arduino MKR-W1010 GET on a stack that consists of a motor driver, shield, IMU shields, and prototyping shield. [Matt] did discover a design error on the motor driver board, which caused the main power switching MOSFET to burst into flames from excessive gate voltage. Fortunately he was able to work around this by simply removing the blown MOSFET and bridging the connection with a wire.

The head-on D-O is very expressive and [Matt] used four servos to control its motion, with another three to animate the three antennas on the back of its head. Getting all the mechanics to move smoothly without any slop took a few iterations to get right, and the end result looks and moves very well. Continue reading “Building D-O, The Cone Face Droid” →

Did Grandma Remember Her Pills? This Dispenser Tells You!

May 16, 2020 by 4 Comments

Everything has to be smart these days, and while smartening things up is a good incentive to tip your own toes into the whole IoT field, many of these undertakings are oftentimes just solutions looking for a problem. Best case, however, you actually make someone’s life easier with it, or help a person in need. For [Guli Morad] and [Dekel Binyamin], it was a bit of both when they built their automated pill dispenser: help people dependent on taking medication, and ease the mind of those worrying whether they actually remembered to.

Using an ESP8266 and a rather simple construct comprised of a set of servos with plastic sheets attached, and a plastic tube with strategically placed cuts for each pill type, a predefined amount of each of the pills can be automatically dispensed into a box — either at a given time, or on demand — using a Node-RED web interface. A reed switch mounted on the box then monitors if it was actually opened within a set time, and if not, informs emergency contacts about it through the Telegram app. Sure, a tenacious medication recipient might easily fool the system, but not even adding a precision scale to make sure the pills are actually taken out could counter a pill-reluctant patient of such kind, so it’s safe to assume that this is primarily about preventing simple forgetfulness.

Their proof of concept is currently limited to only two different types of pills, but with enough PWM outputs to control the servos, this should be easily scalable to any amount. And while the built may not be as sophisticated as some pill dispensers we’ve seen entering the Hackaday Prize a few years back, it still gets its main task done. Plus, when it comes to people’s health, a good-enough solution is always better than a perfect idea that remains unimplemented.

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Ultra-Cheap Microcontroller Powers Addressable 7-segment Display

May 16, 2020 by 35 Comments

Since their being revealed to our community over a year ago, the various ultra-cheap microcontrollers in the sub-ten-cent price range have attracted a lot of interest but not so many projects. Their slightly annoying programming and PIC12-derived architectures present a barrier not mitigated by their price, when picking up an Atmel or other processor represents a much easier choice. That’s not to say that they aren’t slowly making an appearance though, and a cracking example comes from [Tim], who’s used a Padauk microcontroller to make an addressable 7-segment display. If you’re used to addressable multi-colour LEDs, this extends the idea into the world of numerical information.

The result is a PCB little bigger than the 7-segment display it serves, with interlocking 0.1″ pin connectors allowing daisy-chaining of modules. The extreme low cost of the parts makes it an attractive solution. Software wise it’s driven in a similar manner to addressable LEDs, and he goes into significant detail on its protocol. The firmware can be found in a GitHub repository. He directs readers to the Easy PDK programmer and the Small Device C compiler, which should be of interest to anyone tempted by these processors.