J.M. Pearce’s water-testing platform uses open source electronics and 3D printed components.
Clean water is a tough commodity to come by in most of the developing world or even California for that matter. There are several low-cost methods to treat ‘shady looking’ water but the equipment needed to test the water before and after its cleaned are costly and some are even lab bound, meaning they’re not portable.
To get around those issues Joshua M. Pearce and his team from the Department of Materials Science and Engineering at the Michigan Technological Institute designed a new low-cost open sourced 3D printed Water Testing Platform.
Their platform was designed using OpenSCAD modeling software with the inner electronics consisting of an Arduino, microcontroller and LED display shield, which is paired with firmware acquired from GitHub (also open source) that provides menu navigation for the devices various functions.
All of those electronics are packed inside a portable polymer case created using a RepRap 3D printer, which makes for a truly open sourced, cheaply produced efficient water tester that can be used anywhere. For more information on the Open Source Water Testing Platform head here for the academic paper. You can find the files for building one on Libre3D.
Anderson Ta, one of the judges for Make’s Ultimate Guide to 3D Printing, shares his background in Bio printing. He discusses the difficulties with printing living tissue and recent advancements in that area. Anderson also shares some observations of the printers he saw during the review process.
Unconscious habits can kill. It’s via our mucus membranes that Ebola most often infects the body: eyes, nose, and mouth. Do you think about it before scratching your nose? Do you deliberate before adjusting your goggles? No, we all have unconscious habits which in the context of Ebola can result in deadly exposure.
To help address this risk I posted this idea at Fighting Ebloa.
This idea is to put reusable wrist bands on caregivers which will trigger a warning chirp if they get within 12 inches of their goggles where a proximity sensor with speaker will be attached. Both wristbands and goggle proximity sensor should:
– be reusable after immersion in a mild disinfectant
– run on inexpensive, long life industry-standard batteries
– have increasing rate and pitch as the distance closes
This would be a fairly easy hack but it needs to be small and elegant.
The above short description is the core of my idea submission.
It’s short and sweet but perhaps the root of a life-saving solution.
Got an idea? Take a moment. We can make a difference against Ebola.
Only nine days left for YOU to post YOUR ideas! Submissions close on 11/7.
Wearable “Flash Sensor” to Measure Heat/Humidity Inside Protective Suits
Attention sensor fans! The protective suits worn by Ebola caregivers in West Africa get HOT! The heat and moisture buildup reduce work time to a paltry 40 to 60 minutes per shift. Maker solutions such as this Flash Sensor, prototyped by Kailey Shara, are helping.
Caregivers on the front line of the Ebola crisis are torn between two competing priorities. On the one hand they want to help the sick as long as possible; on the other hand they need to limit their time inside the protective suit. With the buildup of their internal body temperature they get fatigued, their judgement becomes impaired, and eventually they can suffer from heat stroke. The impulse to keep working can lead to bad consequences and the results can be tragic. Mistakes will be made.
Rather than the caregiver managing this for themselves why not reveal their thermal conditions to the people around them? By making this information visible to others, the caregiver community can watch out for one another and keep each other safe. That was the idea at the core of the project.
Nicole Daphne Tricoukes and Kailey Shara
The starting point for this project was Carbon Origins’ Apollo micro controller board with eleven sensors, wireless (BLE and WiFi) and a little OLED screen. Since Kailey designed this board she was quite proficient with it. Using Apollo’s temperature and humidity sensors she wrote code to display these metrics on the little 128 x 64 pixel screen. The idea was to slip this into an inside pocket in the suit behind a transparent window so it could be seen outside but still detect conditions inside the suit.
When the caregiver puts on their protective suit is when they would activate the sensor. Under safe heat and humidity conditions the Sensor Flasher would display numbers as seen above while pulsing an audible tone. As conditions worsen in the suit the pulse rate would increase in pitch and frequency. When conditions become dangerous the display would begin to flash alerting the people around them that action needs to be taken. With the Flasher Sensor the caregiver community is empowered to take care of their own.
This is just one wonderful example of what could be done with sensors, actuators and micro controllers to help Fighting Ebola. More could be done to improve conditions with protective suits. More could be done to provide care while reducing direct exposure to the sick. More could be done to remotely measure, collect and analyze patient data. A wide range of problems could be addressed by those with ideas and electronic prototyping skills.
We have less than a week to go in the Grand Challenge against Ebola.
This is a rare opportunity for makers to have significant impact.
Let’s show the world how we can help! #FightingEbola
We have all smelled it: smoke from burning wood. Whether it’s from wildfires, campfires, or fireplaces, trillions of tiny particles float into the air when wood burns. In my neighborhood in northern California, most of the particle pollution in the wintertime originates from my neighbors’ burning wood in their fireplaces not for warmth, but for aesthetic reasons.
It matters because when particles are inhaled, they cause health problems ranging from asthma to heart attacks. And if you think your chimney sends the particle up, up, and away from your house, you’re wrong. A study (Pierson et al., 1989) showed that 70% of the particle pollution that goes up the chimney re-enters your home or impacts your neighbors. So you’re just polluting yourself.
While I don’t want to out people in my neighborhood for burning wood, my geeky, let’s-measure-everything curiosity got the best of me. So I decided to set up a mobile wood smoke monitoring system in my car. I mostly wanted to see if I could detect which streets were more polluted. So, armed with a decent (yet expensive) particle measuring instrument, an Arduino, software, and two spare weekends, I created a system that worked quite well. This post will briefly describe the system and present the results.
I chose to use a mid-cost ($5,000) particle measurement device and a bunch of DIY items. This helped ensure particle measurements of sufficient quality to draw conclusions from, yet provided a system where lower-cost particle sensors could replace the expensive instrument someday. The setup consisted of:
- Nephelometer for measuring particles and estimating PM2.5 (particulate matter of 2.5 micrometers or less in size). This unit, manufactured by Thermo Scientific, uses a pump to draw air into a chamber, where particles scatter light into a photo detector. The light scattering is proportional to the amount or mass of particles in the air.
- Cyclone inlet that spins the air to remove the larger particles and creates an airflow with only the smaller, unhealthy particles (less than 2.5 micrometers).
- Copper tubing that guides the inflow air from the Cyclone inlet to the Nephelometer.
- DTH temperature and humidity sensor mounted outside on the copper tubing. Measuring humidity was important because during moist conditions (>85%), water condenses onto particles and falsely causes more light scattering, and thus higher PM2.5 measurement.
- AirCasting, an open-source platform for recording, mapping, and sharing health and environmental data using your smartphone.
The Arduino received inputs from the nephelometer and the temperature and humidity sensors. Measurements were averaged every second and sent, via Bluetooth, to the AirCasting app running on my Android phone. The real-time data streamed into the app’s screen, which helped me confirm the smoky and clean streets in my neighborhood in real time, while I was driving around. When I finished driving the route, I saved the measurement session with all its data and uploaded it to the AirCasting.org website. I’ve driven hundreds of miles in northern California with this measurement system. On one night, November 10, 2013, I repeatedly drove a route in my neighborhood.
The data showed lots of interesting things (as shown in the figures below). Conditions in the afternoon (1400 PST) showed good air quality levels throughout the neighborhood — no burning yet. By early evening (1800 PST), one residential area right next to Santa Rosa’s major hospital showed very high PM2.5 levels from wood burning. In fact the PM levels were over 150 ug/m3, which is Very Unhealthy on EPA’s air quality index. This is approaching levels that you would commonly see in polluted cities like Beijing. It’s remarkable how localized the smoke can remain. Notice that on one street the air quality levels are healthy (or Good), whereas on Parker Drive the air is Very Unhealthy.
By 1900 PST, the wood burning continued at homes near the hospital. Air quality on other streets was at Moderate levels due to isolated burning and due to a weather condition called a temperature inversion. The temperature inversion acts like a lid on the atmosphere and traps pollution (in this case smoke) near the ground. By 2000 PST, light and variable winds slowly dispersed the smoke near the hospital hundreds of feet to the southeast. One hour later, at 2100 PST, the air quality levels were Moderate throughout the area, and the hot spot near the hospital had dispersed. But the particles just didn’t disappear; while no longer concentrated and unhealthy, the particles were just pushed to some other neighborhood by the slow and gentle overnight winds.
Post script: I haven’t ratted out my neighbors, but I have let some of them know that we are only polluting ourselves.
Pierson W.E., Koenig J.Q., and Bardana E.J. (1989) Potential adverse health effects of wood smoke. The Western Journal of Medicine, 151(3), 339-342, September. Available at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1026893/pdf/westjmed00121-0093.pdf.
Pull tabs as a solution for easier disrobing
Contamination; mixing the bad with the good. In this case, getting Ebola virus on yourself. As a worker takes off protective clothing is when they’re most likely to get exposed. Every effort to make the awkward disrobing process easier is a step in the direction of increased safety. Turns out that tabs are a great feature for making this happen.
One source of maker innovation comes from applying the ideas of one discipline to another. In this case, looking into wet suit design provided insight for improving PPE suits. Everybody knows that removing a back-entry wet suit starts with pulling down a zipper with a long strap attached. Why not do the same with PPE and add straps to back-entry suits? Also, to have the greatest impact on the current Ebola epidemic it would be cheaper and speedier to apply retrofits to existing equipment.
So where could tabs or straps be added to a PPE to make removal easier and safer? Under the leadership of Nicole Daphne Tricoukes, a team which included Kailey Shara and Brian Russell set out to answer that question. The results were three distinct sets of tabs which could be added to existing suits which enhance safety while disrobing.
Collar tabs used in a peeling action to safely remove back-entry PPE suit
First, to peel off a back-entry PPE suit requires a bit of physical gymnastic and if you’re trying to avoid contamination this isn’t a good thing. Ideally clean hands would only touch the clean interior of the suit to pull and remove it. Problem is, there’s nothing to grasp normally. However, by adding tabs inside the collar flaps you provide a gripping point to pull and peel. This is a cheap retrofit solution that can be added to existing suits.
Cuff tabs to ease pant legs over boots
Second, if you watched the PPE disrobing video you’ll know that getting the pant legs off over the boots is a clumsy process. It’s just plain hard to get the cuff over the heal to begin slipping the boot up through the pant leg. What if a tab was sewn at the base of the leg? As you see above, the other foot could step on the tab thereby securing the cuff and allowing the boot to be pulled out of the suit in a much less clumsy and therefore less unsafe manner. Again, an inexpensive retrofit to existing PPE inventory.
Zipper tabs used to make unzipping easy and safe
Third, while the tab extenders made grasping the zipper easier, the use of long straps makes unzipping simpler as shown at the top. One strap is attached to the PPE collar while another is attached to the zipper tab extender. The first strap secures the collar while the second strap pulls to unzip the PPE. Opening the suit safely is a critical first step to releasing body heat build-up and beginning the recovery period. Best of all? This is again a cheap retrofit.
The design guidelines for this project call for low-cost, easy to produce, quick to deploy, and impactful solutions. These uses of add-on tabs are wonderful examples of this.
Perhaps in reading this you saw a way to improve it? Maybe you’d like to learn more about this solution? If so then come on over to the project on OpenIEDO and join in. Makers are welcome! #FightingEbola
Healthcare Workers Fighting Ebola on the Front Line (photo from US AID)
The Fighting Ebola Challenge has hit its halfway mark. Ideas have poured in from around the world with over 700 people collaborating on solutions to help healthcare workers on the front lines. Makers are jumping on board.
Some reminders about Challenge design goals from the OpenIDO team:
First, ideas should have the potential for significant impact within a short time frame – we want to get ideas to the field in a matter of months! Second, ideas should be low cost and easy to produce. And third, ideas should be simple to deploy and adopt – keep in mind the infrastructure limitations as well as our human center design principles.
Do you have an idea that’s ready for the world?
Get prepped with background on the virus, personal protective equipment and the challenges of PPE suits. Then, jump over to the OpenIDEO overview of the Fighting Ebola Challenge and get started. Ebola is wrecking havoc on thousands of peoples’ live. Many are dying and many more are in jeopardy.
Creative makers can solve problems; we can help in the fight against Ebola.
Evolutions of a Zipper Pull Tab Extender
Exhausted from heat inside a protective suit and burdened with layers of gloves, to disrobe you need to grasp and pull a tiny zipper tab. Who needs this challenge!? Not only would this be frustrating but it could be dangerous. Lack of dexterity and coordination can cause exposure to infection. One solution proposed at Fighting Ebola was to design an enlarged, clip-on zipper tab.
Thermal Image of Retained Heat After Just One Hour
Remember, working inside a PPE suit in West African is exhausting. Body heat builds up. You sweat profusely. Judgment becomes impaired and coordination is affected after just 40 to 60 minutes. Caution is needed to avoid exposure to Ebola so these conditions represent risk. To address this, Brian Russell decided that making the PPE’s zipper tab larger would facilitate safe disrobing and he developed it as part of this larger project.
Understand that the Fighting Ebola Grand Challenge is to provide relief ASAP to caregivers on the front lines of the Ebola crisis. We’re looking for solutions NOW, not in 12 months, so Brian needed to develop a tab-extender that would work with existing PPE suits. He needed to make existing zipper tabs larger to make current suits easier to remove.
First Prototype of Pull Tab Extender
My favorite insight of Brian’s was that the zipper tabs have a hole at the tip. This was key to figuring out how to connect the new tab sleeve to the existing zipper. He determined that by printing a sufficiently large dimple in the right place within the sleeve the tab extender would “click” into place and hold. This meant tab extenders could be used on the existing inventory of PPE suits. Brilliant!
First Prototype in Use
Sitting down with calipers Brian measured the tab and started modeling in Autodesk Inventor. Through a series of prototypes, trial and error, and input from experts he worked through the variety of prototypes you see above.
Key input came from the head of training for Médecins Sans Frontières (Doctors Without Borders) in Africa. The hole needed to be a certain size for gripping with gloves but not too big within the overlapping folds of the suit. Sharp corners had to be avoided because they could open wounds thereby risking infection from Ebola. These insights can only come from subject matter experts and they are available at the project’s OpenIDEO site to provide feedback to YOU on YOUR ideas.
Final Prototype in Use
This zipper extender is the type of maker project that can help save lives. It takes effort to learn about Ebola and about working in PPE suits but with this knowledge you too can help fight the battle. Come see what others have proposed, submit your own ideas, or contribute to others’ submissions. This is a collaborative effort.
Makers can help; are you one of them?
Ebola Training Videos from Catherine Bachy
Between the caregiver and the Ebola virus is protective clothing. Dressing and undressing correctly are essential for safety. These training videos instruct workers on how to do both correctly. Worn right it protects; worn wrong it infects.
Let’s remember the context. Infection comes from contacting the virus and transferring it to your system. Being careless or not following the steps in these videos puts a care worker at risk.
Also, remember these folks in West Africa are working in high heat and humidity. Due to the risk of heat exhaustion they’re allowed to work only 40 – 60 minutes per shift. That means they dress and undress within one hour, will take a break, and then go through the whole routine again!
This series on Makezine.com is meant to inform and enlist you, the maker, in the fight against Ebola. In coming posts we’ll be featuring maker-solutions being matured over on Fighting Ebola. Stay tuned and if you want to stay current on developments then follow #FightingEbola.
Join the fight!
A Demonstration on Suiting-up in a PPE
Since contracting Ebola can only happen when people come in contact with infected fluids, caregivers need to be protected. Personal Protection Equipment (PPE) are actually the solution but current PPE come with drawbacks. Improving PPE is a major goal of Fighting Ebola and it’s one area where makers can have an impact. What follows is an introduction to PPE because we can’t improve them if we don’t understand them.
Hood, googles, mask of a PPE.
PPE as pictured above is a series of layers put on in a specified order. The first layer is body cloth cover, followed by Tyvek, followed by Tychem where each progressive layer breathes less, is less permeable. Layers of gloves are also put on in a specific sequence. Lastly, to protect the mucus membranes located in the eyes, nose and mouth healthcare workers dawn head covers such as hoods, duckbill masks and goggles. Getting the sequence right is important to being protected; even more important is taking the PPE off properly as that’s when a slip-up poses the risk of infection.
Photo by Ted Eytan
At this point caregivers are dressed and ready to work so what do they do in this getup? In an Ebola Care Unit (ECU) they provide care to the sick. This means monitoring patients’ conditions, examining them and doing procedures like drawing blood. Patients often need assistance eating, drinking and taking their medicine. Caregivers will also clean the sick and provide emotional support. Remember, they’re doing all this from inside this layered getup, in close proximity to the virus, and with the utmost need to be careful while at the same time being helpful.
Ebola patients in the ECU are not in good physical condition. They’re weak and need help walking or they need to be carried. They produce lots of fluids such as vomit and diarrhea which are filled with Ebola virus. Patients are understandably restless, depressed and anxious. Having to deliver care is difficult enough but these factors complicate matters.
A care giver’s life inside the PPE is not pleasant. By design the suit doesn’t allow for much ventilation so as you generate heat the temperature in the PPE goes up. In an air conditioned room a person would get hot; in the warmth of West Africa they quickly overheat and dehydrate as their body sweats in an effort to cool itself. In addition to heat there are issues with how their senses are impaired. You might have goggles on which are probably fogged and their peripheral vision is restricted. Their head is covered so their face is hidden, their voice is muffled, their hearing and situational awareness are impaired. It’s suffocating, requires constant vigilance and restraint of habits to not become infected, and there’s a feeling of physical and emotional isolation. These introduce serious challenges to effective care delivery!
Only 40-60 minutes of work time.
Conditions in this gear are so bad that there are serious impacts on scheduling care givers. A worker can only realistically withstand conditions for 40 – 60 minutes inside a Tychem-C PPE before needing to disrobe. With such short windows of uptime there’s pressure to optimize how care time is spent. Physical and psychological conditions in the suit are such that there’s a required recuperation period before suiting up again. Resource planning is greatly complicated by this cycle of downtime to recovery. Planning must be done by the man hour of labor. In the context of too few healthcare workers and a rapidly growing epidemic the PPE issues become a real challenge.
Oh and what’s the per unit cost for this outfit? The Ebola outfit at the top of this post is roughly $60 and, again, it’s almost all thrown away after one hour. Seems to me there’s lots of opportunity for makers to improve on this situation!