Hackaday Prize Entry: Open-source Pulse Oximetry

August 19, 2015 by Dan Maloney 9 Comments

Chances are pretty good you’ve had a glowing probe clipped to your fingertip or earlobe in some clinic or doctor’s office. If you have, then you’re familiar with pulse oximetry, a cheap and non-invasive test that’s intended to measure how much oxygen your blood is carrying, with the bonus of an accurate count of your pulse rate. You can run down to the local drug store or big box and get a fingertip pulse oximeter for about $25USD, but if you want to learn more about photoplethysmography (PPG), [Rajendra Bhatt]’s open-source pulse oximeter might be a better choice.

PPG is based on the fact that oxygenated and deoxygenated hemoglobin have different optical characteristics. A simple probe with an LED floods your fingertip with IR light, and a photodiode reads the amount of light reflected by the hemoglobin. [Rajendra]’s Easy Pulse Plugin receives and amplifies the signal from the probe and sends it to a header, suitable for Arduino consumption. What you do with the signal from there is up to you – light an LED in time with your heartbeat, plot oxygen saturation as a function of time, or drive a display to show the current pulse and saturation.

We’ve seen some pretty slick DIY pulse oximeters before, and some with a decidedly home-brew feel, but this seems like a good balance between sophisticated design and open source hackability. And don’t forget that IR LEDs can be used for other non-invasive diagnostics too.

The 2015 Hackaday Prize is sponsored by:

Hackaday Prize Entry: The 70s Called. They Want This Calculator

August 18, 2015 by Bryan Cockfield 32 Comments

For those of us who grew up during TI’s calculator revolution, the concept of reverse polish notation (RPN) might be foreign. For other more worldly calculator users, however, the HP calculator was ubiquitous. Hewlett-Packard peaked (at least as far as calculators are concerned) decades ago and the market has remained dominated by TI since. Lucky for those few holdouts there is now a new microcode emulator of these classic calculators.

Called the NP25 (for Nonpariel Physical), the calculator fully emulates the HP-21, HP-25C and HP-33C. It’s a standalone microcode emulator, which means that these calculators work exactly as well as the original HP calculators of the 70s did. The new calculators, however, are powered by a low power MSP430G2553 processor and presumably uses many, many fewer batteries than the original did. It has an LED display to cut power costs as well, and was built with the goal of being buildable by the average electronics hobbyist.

Even if you didn’t grow up in the 70s with one of these in your desk drawer, it’d still be a great project and would help even the most avid TI user appreciate the fact that you don’t have to use RPN to input data into calculators anymore. Not that there’s anything wrong with that. This isn’t the only calculator we’ve featured here, either, so be sure to check out another free and open calculator for other calculator-based ideas.

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Hackaday Prize Entry: Project Dekoboko 凸凹 Maps Bumpy Roads On A Bike

August 17, 2015 by Richard Baguley 14 Comments

If you live in New England (like me) you know that the roads take a pounding in the winter. Combine this with haphazard maintenance and you get a recipe for biking disaster: bumpy, potholed roads that can send you flying over the handlebars. Project Dekoboko 凸凹 aims to help a little with this, by helping you map and avoid the bumpiest roads and could be a godsend in this area.

The 2015 Hackaday Prize entry from [Benjamin Shih], [Daniel Rojas], and [Maxim Lapis] is a device that clips onto your bike and maps how bumpy the ride is as you pedal around. It does this by measuring the vibration of the bike frame with an accelerometer. Combine this with a GPS log and you get a map of the quality of the roads that helps you plan a smooth ride, or which could help the city figure out which roads need fixing the most.

The project is currently on its third version, built around an Arduino, Adafruit Ultimate GPS Logger shield, and a protoboard that holds the accelerometer (an Analog ADXL345). The team has also set up a first version of their web site, which contains live data from a few trips around Berlin. This does show one of the issues they will need to figure out, though: the GPS data has them widely veering off the road, which means that the data was slightly off, or they were cycling through buildings on the Prinzenstrasse, including a house music club. I’ll assume that it was the GPS being inaccurate and not them stopping for a rave, but they will need to figure out ways to tie this data down to a specific street before they can start really analyzing it. Google Maps does offer a way to do this, but it is not always accurate, especially on city streets. Still, the project has made good progress and could be useful for those who are looking for a smooth ride around town.

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Hackaday Prize Entry Closes But Work Continues

August 17, 2015 by Mike Szczys 4 Comments

If you’ve been watching the countdown timer you’ve noticed that it’s run its course. The entry window for the 2015 Hackaday Prize is now closed, but that doesn’t mean you can stop what you’ve been doing. As we begin judging this slate of entries, heed my advice and continue working on your project in earnest because the next judging deadline is right around the corner: September 21st at 1:50pm Pacific Time.

For all entries complete the following:

A second video of no more than 5 minutes including footage of your prototype in action
A total of 8 project logs
A nearly complete components list
A rendering or drawing of the design/look and feel of the project

Early next week we will announce the 100 projects that move on to the next round. We will also announce which of the Best Product entries will be among the 10 finalists. The Best Product competitors have additional benchmarks to meet:

Best Product Entries must complete the following:

A third video between 5-10 minutes in length
A total of 12 project logs
A compete components list and a bill of materials for one unit
Schematics
Design Files

Of course the Hackaday Prize is about building something that matters and documenting it as an Open Hardware project. Thank you for sharing your time and talent in preparing your entry. To recognize your effort this year, we’ll be awarding a commemorative T-shirt to all who complete the entry requirements. More information about claiming that shirt will be sent in the coming weeks.

The 2015 Hackaday Prize is sponsored by:

Hackaday Prize Entry: Soft Orthotics

August 14, 2015 by Brian Benchoff 7 Comments

Nearly a million people in the US suffer from CP, a neurological disorder that causes spastic motion in the limbs. One of the biggest quality of life factors for CP sufferers is the ability to use their arms, and that means an expensive and clunky orthotic around their elbow. [Matthew] has a better idea: why not make a soft orthotic?

This is not [Matthew]’s first project with soft robotics. He’s the lead scientist at Super Releaser, the company responsible for the completely soft robotic Glaucus atlanticus and other soft pneumatic robots.

This soft, flexible orthotic exoskeleton is designed for sufferers of chronic movement disorders. Traditional orthotics are expensive, difficult to move, and uncomfortable, but by designing this orthotic to be just as strong but a little more forgiving, these devices minimize most of the problems.

The Neucuff is constructed out of extremely simple materials – just some neoprene, a velcro, and a CO2 cartridge. The problem with bringing this to market, as with all medical devices, is FDA requirements and certifications. That makes the Hackaday Prize an excellent opportunity for [Matthew] and the rest of Super Releaser, as well as anyone else trying to navigate regulatory requirements in order to change the world.

The 2015 Hackaday Prize is sponsored by:

Crazy Good Odds To Win The Hackaday Prize

August 14, 2015 by Sophi Kravitz 9 Comments

I entered the Hackaday Prize in 2014. I entered because Hackaday editor [Brian Benchoff] persuaded me to. I ran into Brian at the HOPE conference in NYC and he told me that there were about only 800 entries to compete against.

I didn’t enter until a day or two before the deadline, which is where we are today. The deadline for this year’s 2015 Hackaday Prize is on Monday. Again there are around 800 entries to compete against.

When I entered the competition last year I never dreamed that I’d be managing the same contest this year. I didn’t know much about contests, and I certainly never thought that the odds of winning anything were very good. It is very easy to talk yourself into thinking that everyone else’s project has a better chance of winning.

So now that I’m working in it, I see all of the entries every day, I talk to all of you daily about your projects (which is an awesome part of my life, thank you!) and I can tell you that everyone else’s project does not have a better chance of winning than yours.

Best Product Has Crazy Good Odds

New to the 2015 Hackaday Prize we added a Best Product category. The Best Product is meant to encourage that small window of opportunity between project prototype and product. We ask that products entered into this category get 3 copies of that product to us before we close entries on Monday. Three copies means that you can duplicate your product, but you still may not yet be in a place where you can turn that into a company.

The crazy thing is that we haven’t received so many entries for this, and the prize for Best Product, besides keeping you in the running for the main Hackaday Prize, is $100,000 and 6 months free rent in the Supplyframe Design Lab. This is a recipe for a successful business start.

The odds are insanely good this time around. For Best Product so far, we’ve got under 100 entries. This means you have a 1 in under 100 chance of winning $100,000. For the main Hackaday Prize, we’ve got under 1000 entries and 5 prizes, so you have a 5 in 1000 chance of winning some portion of $500,000 in cash or prizes.

How do you make sure you’re actually in the running? You complete the requirements! Make your project logs, your cell phone video and your system diagram. You can do this in under a day, so make it happen!

Read the Official Rules Here

Why Enter?

Last year’s Hackaday Prize theme was to “design a connected device” so we upped the bar a little this year. Actually, we upped the bar a lot with a theme of “design a solution to an important problem”. We want you to come up with ideas that have the potential to help a lot of people. We want you to not only think about winning money and trips to space, but to think about others. We gave away stuff — lots of stuff — during the contest to encourage those ideas. I think we all won with that.

We started Hack Chats weekly for the past couple of months and I’ve seen people get job offers, collaborate and start new projects from those chats. So, come to the Hack Chats, get your Prize entries in and use your smarts to effect change!

Hackaday Prize Entry: A Sixth Sense

August 13, 2015 by Brian Benchoff 28 Comments

There’s far more going on in the environment that humans have the senses to detect. Birds migrate with the help of the Earth’s magnetic field, and certain species of fish can detect electrical fields. For his Hackaday Prize entry, [Sebastian] is giving us a sixth sense. He’s building a device that allows anyone to detect the Earth’s magnetic field and find their way north for the summer.

The initial idea for [Sebastian]’s project came after his father’s inner ear was damaged. The doctor told him his brain needed to be trained to work with only one inner ear. If it works for balance, [Sebastian] wondered, why couldn’t the brain be trained to listen to an extra sensory input?

[Sebastian]’s device is an accelerometer and magnetometer, connected to a microcontroller that drives a few vibration motors. By mounting these motors around an ankle strap, [Sebastian] hopes to train his brain to listen to the magnetic fields.

So far, [Sebastian] has a device that can sense the Earth’s magnetic field and buzzes the motor closest to magnetic north. There’s still a lot of work to do, including filtering the magnetometer inputs, adding a ‘sleep’ mode, and putting Bluetooth functionality on board, but it’s already a very well-designed project.