**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 | ||
|---|---|---|---|---|---|
| pdhixenbaugh | "I'm intrigued by the speaker resistance - can that be measured with a multimeter - and what are the rules of thumb for not burning out the timer? " | Read more » | about 8 years ago | |||
| kgradow1 | "https://publiclab.org/wiki/coqui " | Read more » | about 8 years ago | |||
| pdhixenbaugh | "@kgradow1 I'm having trouble finding the coqui activity grid. Could you link to it? " | Read more » | about 8 years ago | |||
| kgradow1 | "Accidentally posted this on the coqui activity grid and looks like I can't remove it. Help? " | Read more » | about 8 years ago | |||
| kanarinka | "Thanks @warren! @kgradow1 - this is a great suggestion for improvement as I've also had that happen. How about @akshaya and I will make a digikey s..." | Read more » | about 8 years ago | |||
| kgradow1 | "This is a great overview! One suggested edit: Include an explanation of how component variability might impact the circuit. I've tried to build th..." | Read more » | about 8 years ago | |||
| warren | "Hi, I reposted this from https://publiclab.org/wiki/coqui-a-simple-water-conductivity-sensor -- to make it into an activity that can be featured in..." | Read more » | about 8 years ago | |||
| pdhixenbaugh | "Ben, thank you for that explanation, it is very helpful in understanding many of the challenges and solutions presented by conductivity field measu..." | Read more » | about 8 years ago | |||
| bhickman | "Hello pdhixenbaugh, I like how you have colored the schematic, makes things much clearer. As for your questions, I'll try and answer them. Firstly..." | Read more » | about 8 years ago | |||
| pdhixenbaugh | "Hi Ben, There is a lot to dive into here. I would really like to learn how this circuit works. I'm also new to this, and have a lot of questions. T..." | Read more » | about 8 years ago | |||
| donblair | "Hi Rebeccah! Fantastic stuff here. Lots to digest, and I have several thoughts -- but first, quickly: the frequency output of the Coqui requires..." | Read more » | about 8 years ago | |||
| cfastie | "Hi Rebeccah, Just in case this can explain the problems when using the proto board, are you aware that the proto board for the Riffle has its pins..." | Read more » | about 8 years ago | |||
| pdhixenbaugh | "Hello Rebeccah! I'm interested in replicating this experiment! The biggest thing I am unsure about is the code - can you link to the riffle code yo..." | Read more » | about 8 years ago | |||
| warren | "Hi, Rebeccah -- looks like your lead image didn't work -- maybe try again, or email it to web@publiclab.org if you can't get it to upload? I'm int..." | Read more » | about 8 years ago | |||
| mathew | "Exciting! thanks for posting about your upcoming process. sounds like you've got it planned out. I know you're very active in the discussion @don..." | Read more » | over 8 years ago | |||
| EdMallon | "Believe it or not, the UNO Datalogger tutorial I posted last year has risen to the top of the traffic stats on our blog, and has generated more tha..." | Read more » | over 8 years ago | |||
| rfdave | "Thanks. I'm thinking about a Water quality Staff made from PVC with temperature, conductivity, and turbidity sensors build in, so I'm not thinking ..." | Read more » | over 8 years ago | |||
| bhickman | "Hi rfdave. To my knowledge the only requirements is that the electrodes be inert. I chose graphite because I had some laying around and its cheap. ..." | Read more » | over 8 years ago | |||
| rfdave | "I've got a question. Is there any reason you couldn't use metallic electrodes instead of the graphite? Stainless steel would be more rugged and po..." | Read more » | over 8 years ago | |||
| bhickman | "Hi donblair, thanks. There is still a bit of development to be done, especially for extended deployments, but I think the design shows promise. I ..." | Read more » | over 8 years ago | |||
| donblair | "Ben, Fantastic job on this! Excellent descriptions of the entire system -- the electronics, the probe design, and the calibration procedure. Ver..." | Read more » | over 8 years ago | |||
| mathew | "I wish I had brands to list, but yes, we've seen commercial probes using small (0-80) screws as their probes. " | Read more » | over 8 years ago | |||
| pdhixenbaugh | "What will be the long term corrosive effects of current and salt water on our stainless steel screws? I think we've seen stainless steel probes on ..." | Read more » | over 8 years ago | |||
| warren | "large yogurt container Love this idea for standardization; used yogurt containers pile up quickly in my house. Or a mason jar! I'd guess material ..." | Read more » | almost 9 years ago |