Water conductivity monitoring
conductivity

**Conductivity** is a measure of a solution's ability to conduct electricity, as measured in Siemens per meter (S/m). (lead image by @ddileona) This page is under development, please add background info: * Info about regulations * Info about ecological or human health impacts * Advocacy leverage points * Constraints we're working within: cost, complexity, sensitivity, time Also see resources on this page: https://publiclab.org/wiki/conductivity_sensing ## Questions [questions:conductivity] **** ## Sensors Here's a list of different conductivity sensors and measurement systems. Also see below for some Do-It-Yourself approaches to measuring conductivity, and [this page](https://publiclab.org/wiki/conductivity_sensing) for more information. * [the Coqui](/wiki/coqui) **** ## Activities Activities for people to test methods (these develop over time) [activities:conductivity] **** ## Existing work [notes:conductivity] ...


Author Comment Last activity Moderation
donblair "ZOMG that's brilliant. I'm going to try to bring the materials required to do a rough prototype of this to Plymouth -- but anyway shouldn't be hard..." | Read more » almost 10 years ago
mathew "Yes, exactly! I would love to see an analog "retro edition" riffle with a microcassette recorder and a 555, maybe in a really nice Ball jar. " | Read more » almost 10 years ago
warren "Wow, i'm not sure I follow all of this, but is one potential advantage of the 555 that we could even skip the arduino entirely, if, say, we wanted ..." | Read more » almost 10 years ago
donblair "E.g. I just found this: http://wiki.openmusiclabs.com/wiki/PWMDAC And, oh gosh, this is fun: http://sensorium.github.io/Mozzi/ And: http://www.ucho..." | Read more » almost 10 years ago
donblair "Good call on the power control chip -- for the riffle-ito design, I'm just using an LDO, which should provide a relatively clean signal? But yeah,..." | Read more » almost 10 years ago
mathew "the power issues are going to be tough. Most power control chips do tricky high-speed things to push out a DC signal and the voltage isn't very cle..." | Read more » almost 10 years ago
donblair "Egads! Mat, thanks for pointing this out! I totally flubbed that one: in the 555 approach, the signal that is passing through the water is indee..." | Read more » almost 10 years ago
mathew "the 555 is pretty simple. There's not that much inside of it. If it simplifies the power circuitry issues you're facing then go with it. I hadn'..." | Read more » almost 10 years ago
donblair "Ah -- great thoughts! And your comment points to an important issue, which is that I myself was unclear (and still am, a bit) as to the utility of..." | Read more » almost 10 years ago
mathew "This is really cool. I would never want to discourage someone from using a 555. And it would be totally sweet to use audio gear to record and ima..." | 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 » about 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 » about 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 » about 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 » about 10 years ago
kanarinka "nice work - it's great to see that the conductivity measurement is coming along like this! " | Read more » about 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
EdMallon "Hi everyone, Just a quick note to say the first gen loggers survived their initial 3 month deployment giving us real water flow data, (6m depth,~ ..." | Read more » about 10 years ago
EdMallon "Hi everyone. I just wanted to post an update as I have done some major code development for the Cave Pearl data logger recently, and a weeks wor..." | Read more » about 10 years ago
EdMallon "Hi Warren. Nice to meet you. Wrt cross posting, I am wondering about the content that would be most helpful to the audience here, as I interwove (w..." | Read more » over 10 years ago
warren "Also see this newly posted discussion of dragging underwater loggers: http://publiclab.org/notes/maxliboiron/02-11-2014/underwater-plume-sampling-m..." | Read more » over 10 years ago
warren "Wow, very cool, Ed. Would you be able to cross-post your blog here? How could we make that easier for you? I think a lot of folks here would be int..." | Read more » over 10 years ago
eustatic "Ed, see my note, excited about this effort. http://publiclab.org/notes/eustatic/3-27-2012/thoughts-water-sensing-needs-non-profits-louisiana " | Read more » over 10 years ago
eustatic "cool!!!! " | Read more » over 10 years ago