**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 | ||
|---|---|---|---|---|---|
| alejobonifacio | "Reading a little more I found that you could change the frequency of the PWM in arduino. I did not try to do this. " | Read more » | 8 months ago | |||
| alejobonifacio | "Hi! good question! The frequency of PWM of arduino is about 500hz. Is that enough for conductivity measurement? " | Read more » | 8 months ago | |||
| JasmineKurb | "Wow, This is amazing. Science is completely based on experiments. If you are staying science then you should know how to do experiments and you mus..." | Read more » | 9 months ago | |||
| Ag8n | "The conductivity cell should take the place of Rx. So disconnect the conductivity cell, disconnect Rx, leave the one of the conductivity cell conn..." | Read more » | 10 months ago | |||
| alejobonifacio | "Thanks @Ag8n for the explanation! I am learning a lot! :nerd_face: " | Read more » | 10 months ago | |||
| alejobonifacio | "Hi @Ag8n! What you suggest sounds interesting. Would it be something similar to the attached diagram? " | Read more » | 10 months ago | |||
| Ag8n | "Further note-EC is electrical conductivity " | Read more » | 10 months ago | |||
| Ag8n | "Especially in mixtures, not all soluble solids are conductive. So yes, you can dissolve (or sometimes suspend) something inert in water. We would..." | Read more » | 10 months ago | |||
| warren | "This is very cool! I do wonder if TDS is going to be consistently correlated with conductivity -- i may just not be well informed but isn't it poss..." | Read more » | 10 months ago | |||
| Ag8n | "Look up conductivity cell and wheatstone bridge Instead of feeding DC into the weatstone bridge, the audio signal is fed in. One leg of the wheats..." | Read more » | 10 months ago | |||
| alejobonifacio | "Thanks for your suggestion @Ag8n, sounds very interesting to try. Anyway I have to be honest and say that I don't quite figure out how to do what y..." | Read more » | 10 months ago | |||
| Ag8n | "It looks like the Coqui is a pretty well designed instrument. But, some of the pharmaceutical instruments would send the tone through a bridge. T..." | Read more » | 10 months ago | |||
| alejobonifacio | "Hi @warren! Yes, 0.1-1 g/L is a useful range at least in rivers in this part of the world, in fact for this river test it worked well. I still have..." | Read more » | 10 months ago | |||
| liz | "Thank you for this close and careful work <3 " | Read more » | 10 months ago | |||
| warren | "Hi @alejobonifacio i wonder if there is an 'ideal' range if we can use resistors or capacitor sizes to shift that to our looked-for "search range" ..." | Read more » | 10 months ago | |||
| liamann67 | " Expert tips for writing bsb42015 answers easily When it comes to writing different assignments in leadership and management. Download the s..." | Read more » | 10 months ago | |||
| EdMallon | "The ones from Fisher Scientific and Thermo have notably better quality seals than no-name brand tubes. So if you are putting them somewhere swampy ..." | Read more » | 11 months ago | |||
| bhamster | "Thanks for this update, @EdMallon! I read the full post you linked and laughed at "Pro-Minillennium Falcons." :smiley: The Falcon tube housing is n..." | Read more » | 11 months ago | |||
| EdMallon | "This latest update was motivated by several factors but the most important ones were: (1) Our own project has grown to the point that every fieldwo..." | Read more » | 11 months ago | |||
| liz | "What a fantastic update! It's great to hear from you @EdMallon. An underwater logger running for a year on a single coin cell battery?? COOL. Taggi..." | Read more » | 11 months ago | |||
| EdMallon | " It’s been a long time since I posted, and you’d be forgiven for thinking the Cave Pearl Project was yet another victim of COVID. While the attend..." | Read more » | 11 months ago | |||
| sirazul71 | "Nice writing. Thanks Life Store is one of the best and most popular online stores. You will find everything you need in the life store. Visit in ou..." | Read more » | over 1 year ago | |||
| waniakzmi | "You are doing well for well-being looking forward to it we are working to provide the best ease by providing medical equipment and products online ..." | Read more » | over 1 year ago | |||
| liz | "Fantastic! Just adding some screenshots of your videos so people can get excited: " | Read more » | almost 2 years ago |