**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 | ||
|---|---|---|---|---|---|
| EdMallon | "It's been a while so I thought I would post a project update to Public Lab 1) We had another successful fieldwork season, marking the deployment o..." | Read more » | about 10 years ago | |||
| Bob | "Here are the links: http://publiclab.org/notes/caseyrcampbell327/09-29-2014/bridget-casey-s-water-sample-locations https://www.youtube.com/watch?..." | Read more » | about 10 years ago | |||
| madelinebilis | "@gabirielle It was pretty easy and it's not super expensive to do! " | Read more » | about 10 years ago | |||
| gabirielle | "i would love if i ever could test it " | Read more » | about 10 years ago | |||
| donblair | "Oh, toilet tank analogy is great! @cversek was talking at LEAFFEST about how, in the water <--> electricity analogy, the only sticking point..." | Read more » | over 10 years ago | |||
| mathew | "changing the capacitance is really easy to explain to people. every transition from a peak to trough of the wave form is queued in by the filling ..." | Read more » | over 10 years ago | |||
| mathew | "yes. we should. It isn't directly evident why we would use audio, given that it is so incredibly data-intensive. We have to make that argument RE:..." | Read more » | over 10 years ago | |||
| donblair | "Aw, shucks :) But yes, it's so cool that we might find some part of design solution space that satisfies all of these! Before Ben pointing me to t..." | Read more » | over 10 years ago | |||
| mathew | "Your diligence in solving this calibration problem in the most user-friendly way that ALSO involves simplifying the electronics AND the signal out..." | Read more » | over 10 years ago | |||
| donblair | "Here's an example of a cheap, through-hole 'trimmer capacitor': http://www.amazon.com/Through-Trimmer-Variable-Capacitors-Brown/dp/B00G9BJTJW/ref=..." | Read more » | over 10 years ago | |||
| boczniak | "very good news :) " | Read more » | over 10 years ago | |||
| donblair | "Ah darnit, I deleted my comment above by accident, instead of editing it ... Okay, the punchline is: The only ways to compensate for the effect t..." | Read more » | over 10 years ago | |||
| donblair | "My endocrine system can't handle all of these ups and downs. But tonight ends on an up. " | Read more » | over 10 years ago | |||
| donblair | "UPDATE: We can dial in the capacitance! Ben pointed me to the fact that 'trimmers' exist: http://www.mouser.com/ProductDetail/Murata/TZB4R500EA1..." | Read more » | over 10 years ago | |||
| donblair | "Yes! And before, when we had a different relationship between freq and conductivity, the only way to do that tuning was to tweak the probe -- and J..." | Read more » | over 10 years ago | |||
| mathew | "this is super excellent. does this mean that people can assemble DIY probes with slightly different relationships that we can now tune to standard..." | Read more » | over 10 years ago | |||
| donblair | "(maybe that should prompt me to reconsider my life direction?) " | Read more » | over 10 years ago | |||
| donblair | "YES! :) I was dancing around with glee last night when I saw the equation for freq vs. resistance and capacitance for the 50% duty cycle! " | Read more » | over 10 years ago | |||
| warren | "This is great news!!! And well presented! " | Read more » | over 10 years ago | |||
| btbonval | "Recently bumped into this: http://circuitmaker.com Haven't looked much into it, but the front page shows there are some collaboration tools as par..." | Read more » | over 10 years ago | |||
| mathew | "I'm fully in support of distributing proto-boarded Coqui's over circuit boards, mainly because we may need to add parts/change the resistor and cap..." | Read more » | over 10 years ago | |||
| mathew | "Upverter is nice, Eagle is just as user-friendly as a CAD software from the 80's is expected to be... We should find someone to give us all a KiCAD..." | Read more » | over 10 years ago | |||
| warren | "Great, thanks Don. I can change the title/body to reflect whatever name you think is more appropriate -- "Coqui-based water conductivity sensor"? ..." | Read more » | over 10 years ago | |||
| 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 10 years ago |