Supercon: Designing Your Own Diffractive Optics

November 16, 2018 by Brian Benchoff 15 Comments

Kelly Peng is an electrical and optical engineer, and founder of Kura AR. She’s built a fusion reactor, a Raman spectrometer, a DIY structured light camera, a linear particle accelerator, and emotional classifiers for likes and dislikes. In short, we have someone who can do anything, and she came in to talk about one of the dark arts (pun obviously intended): optics.

The entire idea of Kura AR is to build an immersive augmented reality experience, and when it comes to AR glasses, there are two ways of doing it. You could go the Google Glass route and use a small OLED and lenses, but these displays aren’t very bright. Alternatively, you could use a diffractive waveguide, like the Hololens. This is a lot more difficult to manufacture, but the payoff will be a much larger field of view and a much more immersive experience.

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Home Built Flight Sim Combines Virtual And Actual Reality

October 22, 2018 by Richard Baguley 8 Comments

Virtual Reality (VR) and actual reality often don’t mix: watch someone play a VR game without seeing what they see and you see a lot of pointless-looking flailing around. [Nerdaxic] may have found a balance that works in this flight sim setup that mixes VR and AR, though. He did this by combining the virtual cockpit controls of his fight simulator with real buttons, knobs, and dials. He uses an HTC Vive headset and a beefy PC to create the virtual side, which is mirrored with a real-world version. So, the virtual yoke is matched with a real one. The same is true of all of the controls, thanks to a home-made control panel that features all of the physical controls of a Cessna 172 Skyhawk.

[Nerdaxic] has released the plans for the project, including his 3D printable knobs for throttle and fuel/air mixture and the design for the wooden panel and assembly that holds all of the controls in the same place as they are in the real thing. He even put a fan in the system to produce a gentle breeze to enhance the feel of sticking your head out of the window — just don’t try that on a real aircraft.

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Chordata motion capture dancer and 3D model

A Motion Capture System For Everyone

September 24, 2018 by Steven Dufresne 23 Comments

[Chordata] is making a motion capture system for everyone to build and so far the results are impressive, enough to have been a finalist in the Hackaday Human Computer Interface Challenge. It started a few years ago as one person’s desire to capture a digital performance of a dancer on a stage and has grown into a community of contributors. The board files and software have just been released as alpha along with some instructions for making it work, though more detailed documentation is on the way.

Fifteen sensor boards, called K-Ceptors, are attached to various points on the body, each containing an LSM9DS1 IMU (Inertial Measurement Unit). The K-Ceptors are wired together while still allowing plenty of freedom to move around. Communication is via I2C to a Raspberry Pi. The Pi then sends the collected data over WiFi to a desktop machine. As you move around, a 3D model of a human figure follows in realtime, displayed on the desktop’s screen using Blender, a popular, free 3D modeling software. Of course, you can do something else with the data if you want, perhaps make a robot move? Check out the overview and the performance by a clearly experienced dancer putting the system through its paces in the video below.

As a side note, the latest log entry on their Hackaday.io page points out that whenever changes are made to the K-Ceptor board, fifteen of them need to be made in order to try it out. To help with that, they show the testbed they made for troubleshooting boards as soon as they come out of the oven.

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Wind-Blaster: Haptic Feedback That’ll Make You Recoil

September 16, 2018 by Steven Dufresne 8 Comments

A big challenge in the VR world is getting haptic feedback no matter where you are. That’s not so much of a problem when you’re sitting in a chair, the hardware can be attached to the chair or to something near you, what’s referred to as grounded force-feedback. But with VR, we’ve gotten used to at least moving around a room. How then do you feel the recoil of a gun, the pressure against a shield, the inertia of a sword slicing through the air, or the pulsations of magic sword emitting lightning?

A team of researchers at the [MAKinteract Lab] at KAIST, a university in South Korea, have come up with a small device which straps to your wrist and provides all those types of feedback. It’s called the Wind-Blaster and consists of two ducted propellers which can provide up to 1.5N of force. Both propellers are mounted on servos, and with the help of an IMU, the propellers are oriented as needed. An Arduino doing PWM controls the motor speeds.

Fire a VR shotgun and the propellers quickly spin up to 33,000 RPM for just 250 ms, giving your lower arm a quick backward tug, providing the feel of a recoiling gun. Swing a VR sword through the air and the propellers rotate at 33,000 RPM for 400 ms and then linearly decelerate to a stop in 300 ms. Making the propellers move asynchronously with respect to each other causes rotation torque on your arm for a pulsating feeling for the magic lightning-emitting sword. A connected PC runs the games using the Unity game engine. As with drones, there is noise at around 41 dB but the user’s headphones block it out. Watch it in action in the videos below.

Here on Hackaday, we’ve covered few more ungrounded haptic feedback systems. There’s one which responds to light, another which lets you feel textures, and a glove which gets feedback as it controls a robotic gripper.

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This Is Your Solution For Open Source Motion Tracking

September 4, 2018 by Brian Benchoff 22 Comments

The HTC Vive Tracker adds real-world objects to your virtual world. While these real-world objects in virtual environments are now mostly limited to a Nintendo Zapper for a Duck Hunt clone and a tennis racket, the future is clear: we’re going to be playing Duck Hunt and Wii Sports while wearing headsets. The future is so bright, it burns.

Of course, with any piece of neat computing hardware, there’s an opportunity for building an Open Source clone. That’s what [Drix] is doing with his Hackaday Prize entry. He’s created an Open Source Vive Tracker. It’s called the HiveTracker, and it is right now the best solution for tracking objects in a 3D space.

After a few missteps with ultrasonic and magnetic approaches, the team decided to piggyback on the HTC Vive lighthouses. These two base stations scan a laser beam across the room, first vertically, then horizontally. It’s an incredible piece of technology that [Alan Yates] talked about at the 2016 Hackaday Superconference.

While most microcontrollers don’t operate fast enough to see these laser sweeps, the team behind the HiveTracker found one microcontroller, with Bluetooth, and a feature called ‘PPI’. This programmable peripheral interconnect is kinda, sorta like a cross-bar, but designed for more real-time control of applications. With the right software, the team behind the HiveTracker was able to detect the lighthouses and send position and orientation data back to a computer.

This is a stupendous amount of work, and the results are remarkable. You can check out the video below and see that, yes, this is a real, Open Source Vive Tracker.

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Pushing Tin Remotely: The Start Of Flight Control In The Cloud

September 4, 2018 by Al Williams 59 Comments

In a 1999 movie (Pushing Tin), a flight controller is a passenger on a plane and tells the flight attendant that he needs to speak to the person controlling the plane. The flight attendant tells him the pilot is very busy to which the controller responds, “…you really think the pilot is controlling this plane? That would really scare me.” We wonder what that fictional character would think flying into Loveland Colorado. Their Colorado Remote Tower Project. While there’s still a human flight controller, they aren’t physically located at the airport and rely on remote cameras and radar so the controller can be located elsewhere.

The subject airport is the Northern Colorado Regional Airport and is the state’s busiest airport that has no tower. While the concept — generically known as Remote and Virtual Tower or RVT — dates back to 2002, its adoption is only now starting to pick up steam. An airport in Sweden was the first to go live for normal use in April of 2015, but the Colorado installation is the first approved in the United States. If the official site is a little too dry for you, there’s a CBS report with a video that gives you a quick overview of what’s happening. Or dive in with the demonstration video you can see below.

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Two Bit Circus Took The Tech We Love And Built An Amusement Park

August 24, 2018 by Roger Cheng 5 Comments

Carnival games are simple to pick up, designed to provide a little bit of entertainment in exchange for your game ticket. Given that the main point is just to have some silly fun with your friends, most game vendors have little reason to innovate. But we are people who play with microcontrollers and gratuitous LEDs. We look at these games and imagine bringing them into the 21st century. Well, there’s good news: the people of Two Bit Circus have been working along these lines, and they’re getting ready to invite the whole world to come and play with them.

“Interactive Entertainment” is how Two Bit Circus describe what they do, by employing the kinds of technology that frequent pages of Hackaday. But while we love hacks for their own sake here, Two Bit Circus applies them to amuse and engage everyone regardless of their technical knowledge. For the past few years they’ve been building on behalf of others for events like trade shows and private parties. Then they worked to put together their own event, a STEAM Carnival to spread love of technology, art, and fun. The problem? They are only temporary and for a limited audience, hence the desire for a permanent facility open to the public. Your Hackaday scribe had the opportunity to take a peek as they were putting on the finishing touches.

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