In the past few weeks, we have made some significant technological upgrades to our handheld turbidimeter. This product will soon be debuting on our brand new online store. Our circuit board has gone though two design iterations (using EAGLE) in effort to minimize size, and maximize organization and efficiency. Currently, the […]
Welcome back to our blog! New and exciting developments are underway, with more on the visible horizon. Our team was recently awarded the second phase of an EPA P3 Grant Award, contributing $90,000 dollars in project funding and giving us the financial resources to delve in a host of product improvements […]
Greetings, and welcome back to our blog! It was a busy summer for all of us at WASH For All, and we have let this blog lay fallow for a whole season. To get your attention back here where it belongs, we’ve put together an eye-catching dynamic visualization of the […]
Well we’re two days late, but the data on our new turbidimeter setup were worth the wait. WASH For All members Alex Krolick and Chris Kelley tested the current build (single-beam IR LED with TSL230R sensor) against a handheld MicroTPI turbidimeter freshly calibrated at the factory. The two driving questions […]
For a few months now we’ve been working to build an affordable turbidity meter that’s accurate enough for basic water quality testing. Our first prototype was Bluetooth-enabled, used a tethered Android smartphone to display data, and involved an expensive, high-precision 3D-printing process to make the chamber to hold the water sample. […]
We at WASH For All are pleased to announce the alpha release of the water and sanitation infrastructure planning tool WashOpt. The demo site for this application is featured at plan.wash4all.org (the user’s guide is available here). This site will be the public face of a growing set of tools […]
The develop4wash team has been working on constructing a self-contained, sealed turbidimeter using off-the-shelf components. Progress Here’s what it looks like so far: Internally, the unit is powered by an Arduino Uno microprocesser/development board and two TSL2561 luminosity sensors from Adafruit. Bluetooth connectivity is provided by a Virtuabotix Bluetooth module. […]
Hi All, Today at approximately 3:41pm our hosting provider, A2 Hosting, suffered a power outage that affected multiple servers. Our entire site was down for roughly 90 minutes, and our virtual private server (VPS) was down for a few hours. We apologize if you had issues accessing any part of […]
One of the first tools that we put together at WASH for All is called OpenSourceWater. It lets water treatment plant operators send plant performance data to the web using SMS. It’s not fancy like Water For People’s FLOW, and that’s on purpose — being simple means it works, with […]
Building the Testbed We made a wooden block to keep the relative positions of the sample, sensor, and light source constant as we swap out samples: Originally we attempted to use a 3mW board-powered laser as the light source, but it was not powerful enough to generate any meaningful differences […]
Hi Folks, Chris Kelley here. In July of 2012, I took a trip to Honduras to learn more about a type of gravity-driven, non-electric water treatment plant designed by members of the AguaClara program at Cornell University (headed by Dr. Monroe Weber-Shirk). Working with the Honduran development group Agua Para El Pueblo (APP), […]
Turbidity refers to the dirtiness or cloudiness of a water sample. Technicians at water treatment plants regularly measure water turbidity before and after treatment. It’s a legal requirement in many countries, and one indicator of whether treated water is safe for human consumption. The unaided eye can distinguish cloudy water […]
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