Hackaday Prize 2022: A Cheap And Effective Mouth Joystick Mouse

October 19, 2022 by Lewin Day 3 Comments

Some people have issues using regular computer mice, and need alternative input devices that suit their needs. [Olman Orozco] designed an affordable mouth-joystick intended to work as a mouse to suit that very use case.

A simple frame allows the controller to be held near the mouth for use.

The build is based on a simple USB gamepad. A mouse emulator program is used to turn the thumbstick movements into mouse movements, and button presses into mouse clicks.

The trick is that the thumbstick is turned into a mouth-activated joystick, making the device perfect for those with limited-to-no movement in their arms. This is achieved with a pen body used to extend the joystick so it can be readily actuated with the mouth. A custom puff-switch is also integrated into the mouth-joystick, built out of a balloon, bottle caps, and a micro switch. This enables the user to click on things without the need for another button.

Overall, it’s a great hack that turns cheap, everyday components into a useful piece of accessibility hardware. As a bonus, it can be built using only simple tools. [Olman] notes there’s no need for a 3D printer or other advanced parts or tools to build the device.

Game controllers are often important devices when it comes to accessibility hacking, as we’ve seen before. Continue reading “Hackaday Prize 2022: A Cheap And Effective Mouth Joystick Mouse” →

3D Printing A Prosthetic-Compatible Golf Club

September 2, 2022 by Danie Conradie No comments

Relearning an old sport, or starting a new one, can be challenging for amputees. Besides the obvious physical aspects, custom prosthetics or adaptors might need to be made and fitted, which can be very expensive. With the power of 3D printing and some machining, [Ian Davis] was able to build a custom prosthetic golf club to get a quadruple amputee back on the greens.

The recipient of this prosthetic lost both hands above the wrists, so [Ian] had to come up with a mechanism that could hold the club and mimic wrist motion throughout the swing. He was able to achieve this motion with a simple four-plate hinge for each arm. For optimal ergonomics, [Ian] also added two-axis adjustability, with only a single bolt needing to be loosened per axis. A standard golf club can be used and is clamped in the printed holders.

Machined prosthetic sockets were used to allow quick connection to the user’s existing prosthetic forearms. Theoretically, this should also allow him to switch clubs without excessive hassle. [Ian], an amputee himself, has used his engineering skills to build a series of prosthetic hands and even a custom controller mod to get back to gaming with fewer flesh fingers.

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Accessible Arduino Mouse Helps

April 6, 2022 by Al Williams 3 Comments

We enjoy access to cheap stuff because of the mass market for things like mice, keyboards, and cell phones. But if you need a device that doesn’t have mass appeal, you will have to pay a lot more if you can find it at all. However, with modern techniques like 3D printing and Arduino-like microcontrollers being cheap and simple to use, you now have the option to build that special one-of-a-kind device. Case in point: [Davy’s] mouse for people who have brain or nervous system disorders. This particular device is helping a 6-year-old who can’t manipulate a normal mouse.

The device uses an Arduino Pro and an MPU-6050 accelerometer and gyroscope. The original design uses machined aluminum, but 3D printing should work, too. There’s something wrong with the link to the design files in the post, but it is easy to find the correct link.

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Demonstration of the PMDG 737 being controlled by a blind user using Talking Flight Monitor

Flying Blind: Taking Flight Simulation To A New Level In Accessibility

November 2, 2021 by Ryan Flowers 14 Comments

Software developers [Andy Borka] and [Jason Fayre] have a love for aviation. They are also both totally blind. They’ve developed software called Talking Flight Monitor, and it has made flight simulation possible for anyone with impaired vision or blindness, as you can experience in the blurry video below the break. What draws them to aviation and flight simulators?

This fascination with flight is not limited to the sighted, and who wouldn’t want to experience what it’s like to be in cockpit of a modern airliner? I still recall the awe that I felt when at 9 years old, I glanced the flight deck of a McDonnell Douglas MD-80 as I boarded the aircraft. The array of lights, buttons, switches, and gauges dazzled me for years to come. I wanted to know how all of it worked. I wanted to be a pilot. A few years later I discovered Flight Simulator 4 on a 286, and I was hooked for life.

For the vision impaired this presents a problem. Flight simulators are by nature extremely visual, and they lack the text based interface that would allow a screen reader to help a visually impaired person make use of the simulator. Enter Talking Flight Monitor.

[Andy] and [Jason] have worked with PMDG Simulations to create text friendly interfaces for the 737 and 777 produced by PMDG. These ultra-realistic aircraft are available for the Prepar3D flight Simulator, and they result in a combination that blurs the line between Flight Simulator and Flight Training. By modifying these aircraft with accessible control panels, Talking Flight Monitor allows a completely blind flight simulator user to take off, navigate, and even land without ever seeing the screen.

Talking Flight Monitor makes flight possible using over 70 keyboard shortcuts. Both autopilot control and full manual control of the aircraft simulation are possible. Compatibility with standard simulation software is maintained in such a way that tutorials for programming flight computers not controlled by Talking Flight Monitor will still work. It even includes its own voice, so it does not require a screen reader to use.

Our hats are off to [Andy] and [Jason] for their hard work, diligence, and true application of the Hacker spirit. Thanks to [Mike Stone] for this most excellent tip.

[Note: The images in this post are produced by a community of blind flight simulator users who are not concerned with visual quality. They have been intentionally left blurry.]

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Elderly Remote Keeps Things Simple

September 26, 2021 by Al Williams 25 Comments

If you are lucky, you’ve never experienced the heartbreak of watching a loved one lose their ability to do simple tasks. However, as hackers, we have the ability to customize solutions to make everyday tasks more accessible. That’s what [omerrv] did by creating a very specific function remote control. The idea is to provide an easy-to-use interface for the most common remote functions.

This is one of those projects where the technology puzzle is now pretty easy to solve: IR remotes are well-understood and there are plenty of libraries for recording and playing back signals. The real work is to understand the user’s challenges and come up with a workable compromise between something useful and something too complex for the user to deal with.

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Smart Guitar Will Practically Play Itself

May 23, 2021 by Kristina Panos 25 Comments

Playing the guitar is pretty difficult to do, physically speaking. It requires a lot of force with the fretting hand to produce clear notes, and that means pressing a thin piece of metal against a block of wood until the nerve endings in your fingertips die off and you grow calluses that yearn to be toughened even further. Even if you do get to this point of being broken in, it takes dexterity in both hands to actually make music. Honestly, the guitar is kind of an unwelcoming instrument, even if you don’t have any physical disabilities.

A Russian startup company called Noli Music wants to change all of that. They’re building a guitar that’s playable for everyone, regardless of physical or musical ability. Noli Music was founded by [Denis Goncharov] who has a form of muscular dystrophy. [Denis] has always wanted to rock out to his favorite songs, but struggles to play a standard guitar.

If you can touch the fretboard, it seems, you can whale away on this axe without trouble. It’s made to be easier to play all around. The strings aren’t fully tensioned, so they’re easy to pluck — the site says they only take 1.7oz of force to actuate.

Right now, the guitar is in the prototype stage. But when it’s ready to rock, it will do so a couple of ways. One uses embedded sensors in the fretboard detect finger positions and sound the appropriate note whether you pluck it or simply fret it. In another mode, the finger positions light up to help you learn new songs. The guitar will have a touchscreen interface, and Noli are planning on building a companion app to provide interactive lessons.

We have to wonder just how exactly this will be able to mimic the physics of guitar playing, especially since it’s designed with all players in mind. How satisfied will seasoned players be with this instrument? Can it do pull-offs and hammer-ons? What about slides? Do the sensors respond to bends? And most importantly, will the built-in speaker be loud enough to drown out the string vibrations? It seems to do just fine on that front, as you can see in the video below.

If the built-in speaker didn’t drown out the strings, it could make for some interesting sounds that stray outside the western chromatic scale, much like this LEGO microtonal guitar.

Continue reading “Smart Guitar Will Practically Play Itself” →

Thought Control Via Handwriting

May 16, 2021 by Al Williams 12 Comments

Computers haven’t done much for the quality of our already poor handwriting. However, a man paralyzed by an accident can now feed input into a computer by simply thinking about handwriting, thanks to work by Stanford University researchers. Compared to more cumbersome systems based on eye motion or breath, the handwriting technique enables entry at up to 90 characters a minute.

Currently, the feat requires a lab’s worth of equipment, but it could be made practical for everyday use with some additional work and — hopefully — less invasive sensors. In particular, the sensor used two microelectrode arrays in the precentral gyrus portion of the brain. When the subject thinks about writing, recognizable patterns appear in the collected data. The rest is just math and classification using a neural network.

If you want to try your hand at processing this kind of data and don’t have a set of electrodes to implant, you can download nearly eleven hours of data already recorded. The code is out there, too. What we’d really like to see is some easier way to grab the data to start with. That could be a real game-changer.

More traditional input methods using your mouth have been around for a long time. We’ve also looked at work that involves moving your head.