_Main image above is by Suzanne McDaniel, and was taken at Island End River in Chelsea, MA, part of the Mystic River watershed. Suzanne's photo was one of the winners of the [MyRWA photo contest](http://mysticriver.org/photo-contest/)._ ## The Open Water Project The Open Water Project aims to - develop and curate open hardware and open software useful for water-related applications - build and facilitate data infrastructures that allow for easier sharing of water data - encourage the growth of communities focused on 'free and open' approaches to water science - support ongoing work by grassroots communities interested in their own local water quality issues To this end, we've been focusing on several initiatives, in particular: **The RIFFLE: An Open Source Datalogger.** We are working to develop an open source hardware datalogger that can be placed in the field for extended deployments and measure common water parameters like: - temperature - conductivity - depth - turbidity The main Public lab wiki for this device is [here](http://publiclab.org/wiki/riffle). For recent research and descriptions of projects, you can search for 'riffle' on Public Lab, via [this link](http://publiclab.org/search/riffle). **The Coqui: using audio as a sensor data format.** We're also exploring using audio frequencies to convey sensor readings -- like a modem, but even simpler -- in order to make sensor readings more accessible for people (or to enable data transmission over ubiquitous audio jacks on PCs and smartphones). Read more about this idea on the [Coqui wiki](http://publiclab.org/wiki/coqui), or look for recent updates on Public Lab [here](http://publiclab.org/search/coqui). **A mailing list.** Sign up for the [plots-water-quality email list](https://groups.google.com/forum/#!forum/plots-waterquality), and participate in discussions about low-cost, open source water quality monitoring tools and techniques. [](https://i.publiclab.org/system/images/photos/000/012/225/original/riffleStraightUp.png) [](https://i.publiclab.org/system/images/photos/000/012/226/original/Riffle-ito.png) [](//i.publiclab.org/system/images/photos/000/014/362/original/riffleLabel2.png) ##Fracking and Water Quality + Runoff There are also unique water issues related to frac sand. To get some background information and to explore options for addressing water issues as they relate to frac sand mining in your community, [head on over to the frac sand wiki page](https://publiclab.org/wiki/frac-sand). ## Community Projects We'd also like to use this wiki as a place to post links to other projects that embody an 'open science / open source' approach to hydrology and water technologies. Please add your links below! - InfoAmazonia Network: http://publiclab.org/wiki/infoamazonia-network...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| btbonval | "I hadn't heard of upverter. Adafruit has been pushing Eagle software, which is non-libre and has a cost. I've been seeing a lot of Eagle usage in ..." | Read more » | over 9 years ago | |||
| cfastie | "The first time i have ever found a tree frog in my house was at the LEAFFEST where the Coqui was built, tested, and designed for PCB. . . Clearly..." | Read more » | over 9 years ago | |||
| kgradow1 | "Markdown This looks really good! " | Read more » | over 9 years ago | |||
| WhiteRabbit | "Also, FWIW, not all stainless steels are the same. For instance, 316 SS is more resistant to corrosion than 304. " | Read more » | over 9 years ago | |||
| WhiteRabbit | "Be mindful how temperature may affect your saline conductivity measurements, as I tried to point out in the comments here: http://publiclab.org/not..." | Read more » | over 9 years ago | |||
| patcoyle | "Terrific writeup and results, +1 to above comments. Excellent. " | Read more » | over 9 years ago | |||
| straylight | "great workshop, really well run and I loved reading about the glitches along the way :) Now you have a prototype working, the next step would be t..." | Read more » | over 9 years ago | |||
| kanarinka | "Awesome write-up guys - I can't believe how much progress was made in such a short time. I think the audio stuff has so much educational potential ..." | Read more » | almost 10 years ago | |||
| mathew | "visualizing data is hot right now, but this is some next level $#!%-- in-situ data landscape audiolization--- its so cutting edge the spellchecker ..." | Read more » | almost 10 years ago | |||
| warren | "Great tone difference at around 2:26! I love the idea (discussed with @dorncox) of listening to two of these at different ends of your yard, or up ..." | Read more » | almost 10 years ago | |||
| patcoyle | "Don, cat videos? - it's likely going viral " | Read more » | almost 10 years ago | |||
| mathew | "I take it the idea is to get the red/blue flashing really fast, making a gradient red-->magenta--->blue depending on the resistance of the th..." | Read more » | almost 10 years ago | |||
| zengirl2 | "Bummer, I'm scheduled for an artist's opening on Friday night at my nature center (same weekend as the barnraising). However, I could swear I saw ..." | Read more » | almost 10 years ago | |||
| kanarinka | "No worries - if you can travel north a bit you should consider coming to the New England barnraising the weekend of June 5th -- http://publiclab.or..." | Read more » | almost 10 years ago | |||
| zengirl2 | "I live in Philly. I'm currently a LandLab Artist in Residence at the Schuylkill Center for Environmental Education. I'm hoping to study stormwater..." | Read more » | almost 10 years ago | |||
| kanarinka | "Thanks ZenGirl2 - a tutorial is definitely in the works as soon as we have a working prototype that people can use -- we are looking at June 5th fo..." | Read more » | almost 10 years ago | |||
| zengirl2 | "I noticed that you have a lot of Github info, but are you considering writing a tutorial? I'm interested in building a Riffle for Philly. Maybe yo..." | Read more » | almost 10 years ago | |||
| unmanaged | "I would be glad to send some SS welding rods to you free of charge... you have access to the scope and tools I do not... I planted the garden today..." | Read more » | almost 10 years ago | |||
| bgamari | "Over the last few days I've been busily reworking some aspects of the measurement. Now we have a much lower excitation voltage (currently 100mV, al..." | Read more » | almost 10 years ago | |||
| JSummers | "Hi Don, I agree with Cversek that you need to keep the voltage difference small. you also might want to look at using graphite electrodes. The ki..." | Read more » | almost 10 years ago | |||
| donblair | "Cversek -- wow, thank you!!! What a useful collection of info. Your note convinced Ben to add a dual op-amp to buffer the conductivity output, and..." | Read more » | almost 10 years ago | |||
| kanarinka | "nice work - it's great to see that the conductivity measurement is coming along like this! " | Read more » | almost 10 years ago | |||
| cversek | "What is the max amplitude of the voltages you are applying across the screws? If this gets too high you could be electrolyzing the water, other io..." | Read more » | about 10 years ago | |||
| donblair | "Just noticed -- in that last plot, it looks like the 'falling times' (top curve) start 'slumping', whilie the 'rising times' (bottom curve) seem re..." | Read more » | about 10 years ago |