Kate Reed is an artist. Kate Reed also builds hand-driven wheelchair accessories that work with any wheelchair. Wait, what? These things don’t have to be separate skills. We’re living in the age of artisanal creation and Kate is a perfect example that you need to embody all skills. She’s an artist who follows a creative idea from inception through to implementation. Check out her talk on the Creative Process in Action from the Hackaday SuperConference, then jump past the break for some more details on what she’s been building and how she build her diverse set of skills.
Continue reading “Kate Reed: The Creative Process in Action”
The 2015 Hackaday Prize challenged people to build something that matters. Specifically, to solve a problem faced by a lot of people and to make the solution as open as possible. If the average hacker can build it, it puts the power to vastly improve someone’s life in their hands. This is a perfect example of how powerful Open Design can be.
Patrick Joyce, Steve Evans, and David Hopkinson, developed a way to control an electric wheelchair using eye movements. The project, called Eyedrivomatic, is a set of non-invasive hardware modules that connect the wheelchair joystick with existing Eyegaze technology.
You’re probably already familiar with Eyegaze, which allows people suffering from diseases like MND/ALS to speak through a computer using nothing but their eyes. Eyedrivomatic extends this gaze control to drive a wheelchair. The catch is that the wheelchair’s user may not actually own the chair, and so permanent modifications cannot be made.
Thus Eyedrivomatic connects a wheelchair to the existing Eyegaze hardware without permanently altering either. This has never been done before, and the high level to which the team executed this project netted them the Grand Prize of the 2015 Hackaday Prize. The team will receive their choice of a Trip into Space or $196,883.
Check out their acceptance video, then join us after the break to learn what went into this amazing undertaking.
Continue reading “The Gaze-Controlled Wheelchair that Won the Hackaday Prize”
There are a lot of projects in the Hackaday Prize aimed at improving the lives of those of us who are disabled or otherwise handicapped. A good 3D printed prosthetic is a natural idea for the competition, as are projects for the blind and deaf. [Patrick Joyce], [Steve Evans] and [David Hopkinson] are helping a much more debilitating disease: Motor Neuron Disease, or ALS. [Steve] and [Patrick] both have ALS, and they’re working on a project that will use the movement of their eyes to move their wheelchair.
The project began as an idea [Patrick] had a few years ago – why not use commercial eye tracking technology to drive a wheelchair. Eye tracking technology is a reasonably well-solved problem but for some inexplicable reason there are no clear ways to connect this system to a wheelchair.
Over the last few years, [Patrick] taught himself Arduino and Processing to prototype a device that would connect to a computer running an eye tracking tool and to translate this into servo movements. A small 3D printed contraption is connected to the joystick of [Patrick]’s wheelchair, and with just a little bit more code, he can drive his wheelchair around just by looking at a screen. It’s a great use of 3D printing and the humble Arduino, but it’s absolutely impressive this technology hasn’t existed before.
Because [Patrick] can build pretty much whatever hardware he wants, he’s also added a few neat features. The ‘Brain Box’ for this build needs two outputs for servos, but [Patrick] added two more for other purposes. He’ll be mounting a Nerf blaster to the side of his chair, but he also has other ideas of adding a fan, a robot arm, or even IR or RF transmitters; he’ll be able to control his TV with just his eyes.
[Myrijam Stoetzer] and her friend [Paul Foltin], 14 and 15 years old kids from Duisburg, Germany are working on a eye movement controller wheel chair. They were inspired by the Eyewriter Project which we’ve been following for a long time. Eyewriter was built for Tony Quan a.k.a Tempt1 by his friends. In 2003, Tempt1 was diagnosed with the degenerative nerve disorder ALS and is now fully paralyzed except for his eyes, but has been able to use the EyeWriter to continue his art.
This is their first big leap moving up from Lego Mindstorms. The eye tracker part consists of a safety glass frame, a regular webcam, and IR SMD LEDs. They removed the IR blocking filter from the webcam to make it work in all lighting conditions. The image processing is handled by an Odroid U3 – a compact, low cost ARM Quad Core SBC capable of running Ubuntu, Android, and other Linux OS systems. They initially tried the Raspberry Pi which managed to do just about 3fps, compared to 13~15fps from the Odroid. The code is written in Python and uses OpenCV libraries. They are learning Python on the go. An Arduino is used to control the motor via an H-bridge controller, and also to calibrate the eye tracker. Potentiometers connected to the Arduino’s analog ports allow adjusting the tracker to individual requirements.
The web cam video stream is filtered to obtain the pupil position, and this is compared to four presets for forward, reverse, left and right. The presets can be adjusted using the potentiometers. An enable switch, manually activated at present is used to ensure the wheel chair moves only when commanded. Their plan is to later replace this switch with tongue activation or maybe cheek muscle twitch detection.
First tests were on a small mockup robotic platform. After winning a local competition, they bought a second-hand wheel chair and started all over again. This time, they tried the Raspberry Pi 2 model B, and it was able to work at about 8~9fps. Not as well as the Odroid, but at half the cost, it seemed like a workable solution since their aim is to make it as cheap as possible. They would appreciate receiving any help to improve the performance – maybe improving their code or utilising all the four cores more efficiently. For the bigger wheelchair, they used recycled car windshield wiper motors and some relays to switch them. They also used a 3D printer to print an enclosure for the camera and wheels to help turn the wheelchair. Further details are also available on [Myrijam]’s blog. They documented their build (German, pdf) and have their sights set on the German National Science Fair. The team is working on English translation of the documentation and will release all design files and source code under a CC by NC license soon.
When [aimzzz] met this puppy born without arms, the need for some assistive hardware was obvious. We love it that rapid prototyping techniques have become so accessible that something like building a wheelchair for a puppy is not just affordable, but a lot of fun too!
The main part of the projects is a cradle which will be comfortable for the dog. 3D printing is a great choice here because it can be customized to suit the needs of a particular dog. We remember seeing another dog named Derby who has 3D printed legs that make room for the biological legs that aren’t functioning correctly. In the case of this wheelchair, the cradle could be altered make room for legs.
The rest of the build is purely mechanical. Aluminum tubing, tubing connectors, and wheels combine with the printed cradle (and some padding material) to make for one sweet ride. It takes a bit of training to get used to, but as you can see after the break this makes mobility quite easy and intuitive for the pup.
Continue reading “Printing Puppy Prosthetics”
[Josh] hit the same issue we’ve faced before: cable modems don’t match a form factor and usually don’t make themselves easy to mount on something. We could complain about routers as well, but at least most of those have keyhole slots so you can hang them on some screws. Inspiration struck and he fabricated his own rack-mount adapter for it. Velcro holds it in place, with a cutout bezel to see the status lights and an added fan to keep things cool.
Here’s a pair of strange but possibly interesting ones that were sent in separately. The first is an analysis of how much energy short-run CNC prototyping consumes versus traditional manufacturing. The other is an article that [Liz] wrote about getting started with CNC mill bits. She says she compiled all that she learned as she was getting started in the field and wants to save others the effort.
This one goes back several years, but who doesn’t love to hear about a voice-controlled wheelchair?
So you can solder QFN parts but you can’t hammer a nail straight into a piece of wood? The answer, friend, is a laser guided hammer. Someone hire this [Andybot] person, because the solution to the problem shows the ability to out-think an interesting dilemma: how do you put a laser in a hammer head and still use it to hit things?
We’ve seen a lot of these long-range WiFi hacks over the years. This one is worth looking at because of the work done to create an outdoor mount that will stand the test of time.
And finally, we’re still really fond of this 2-bit paper processor that helps you wrap your brain around what’s going on with those silicon wafers that rule our everyday lives. [glomCo] liked it as well, and actually coded an emulator so that you can play with it without printing anything out on paper. We think it takes away some of the fun, but what an excellent programming exercise!
[Shea’s] son [Alejandro] was born with Spinal Muscular Atrophy which limits his ability to move. The ability to explore one’s environment as a toddler is really important to development so [Shea] and his wife have been looking into assistive technology. Their health insurance paid for a medical stroller when he was nine-months old and has told the family they need to wait five years for a powered wheelchair. Rather than wait, [Shea] took it upon himself to hack a wheelchair his son could control.
He found a used adult-sized motorized wheelchair on eBay for about $800. Not cheap, but way more affordable than a brand new unit. This type of chair is made to be controlled with a joystick, an option not available to his son at this point. Foot control was an option if he could figure out how to build an interface.
After unsuccessfully trying to repair a broken digital kitchen scale [Shea] was inspired to reuse the sensors as pedal inputs. [Alejandro] has limited foot strength and the sensitive strain gauges are perfect for picking it up. Above you can see the sandal-based interface he built. The two feet working together affect steering as well as forward and reverse. The pedal system is connected to the wheelchair using a Digital to Analog converter chip to stand-in for the original analog joystick. After the break we’ve embedded a video of [Alejandro] exploring the outdoors in the finished chair.
In this case it’s fortunate that [Shea] has the skills to build something like this for his son. We hope this will inspire you to donate your time an know-how to help those in your own community who are in a similar situation. This really takes the concept of The Controller Project to the next level.
Continue reading “Wheelchair hack lets two-year-old explore on his own”