**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 | ||
|---|---|---|---|---|---|
| MadTinker | "Yeah, that seems right. I should have thought thru it a bit more. " | Read more » | almost 7 years ago | |||
| EdMallon | "We have finally published: A Flexible Arduino-Based Logging Platform for Long-Term Monitoring in Harsh Environments http://www.mdpi.com/1424-8220/..." | Read more » | almost 7 years ago | |||
| cfastie | "I know nothing about this topic, but here is the model I concocted from whole cloth to understand it. Measuring conductivity of water with electro..." | Read more » | almost 7 years ago | |||
| EdMallon | "I try to keep the blog tightly focused on the logger build details. But this year, I felt that I had to say something a bit more pointed about the ..." | Read more » | almost 7 years ago | |||
| EdMallon | "Like a great Hollywood franchise I finally released the prequel to that "Configuring I2C Sensors" post from a few months ago: Adding Sensors to an..." | Read more » | about 7 years ago | |||
| MadTinker | "I would add the following: alkalinity, hardness, and perhaps ORP " | Read more » | about 7 years ago | |||
| EdMallon | "I've been working on an overhaul of the code base for our data loggers and in the process I standardized some of that spagetti code into a simple s..." | Read more » | about 7 years ago | |||
| Sidney_AstroPlant | "Using NIR LEDs seems like a good option to look into and I'm happy to hear that I might not have to deal with extensive filtering! I just got a res..." | Read more » | over 7 years ago | |||
| cfastie | "A simple option might be to turn on some NIR LEDs when the photography happens. The NIR:VIS ratio might not match sunlight, but if you know what it..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "The kit is fully enclosed with LED with a certain blue and red ratio (I have to verify what the exact ratio is). This brings me to the conclusion t..." | Read more » | over 7 years ago | |||
| cfastie | "Thanks for adding a photo. NDVI is based on the assumption that the light illuminating the foliage has a certain proportion of NIR and VIS -- the p..." | Read more » | over 7 years ago | |||
| cfastie | "Using two cameras solves one of the two problems I described (mixed NIR and VIS). That problem can also be solved by measuring or making assumption..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "Thanks Chris for your response. My assumption was that the blue filter supplied with the RPI Noir camera blocks the red channel fully. So you get a..." | Read more » | over 7 years ago | |||
| Sidney_AstroPlant | "Thanks for the positive messages! I see that both of you are active in open source hardware and software initiatives. We are thinking to share our ..." | Read more » | over 7 years ago | |||
| zengirl2 | "Glad you posted here as you know I'm a fan of the project. :) " | Read more » | over 7 years ago | |||
| cfastie | "I haven't used the Pi NoIR cam and have not seen your photos, so I can only respond from general principles. Camera sensors are not as sensitive ..." | Read more » | over 7 years ago | |||
| warren | "Just wanted to say this looks really cool! " | Read more » | over 7 years ago | |||
| EdMallon | "I really appreciate the encouragement guys. But I need at least a month before I could do anything about it. We've already turning away other offer..." | Read more » | over 7 years ago | |||
| warren | "For starters, we would be very interested in cross posting your last post on our blog -- i think even if there's more you'd like to add to it, many..." | Read more » | over 7 years ago | |||
| warren | "I strongly echo everything Chris said - and honestly, we'd really love to give your work more exposure -- I wonder if even simply posting a lot of ..." | Read more » | over 7 years ago | |||
| EdMallon | "Aside form the research goals, I've always wanted to create something that everyone could make on their own. And don't worry about the soldering - ..." | Read more » | over 7 years ago | |||
| cfastie | "Ed, The new Mini Terminal Logger is brilliant. Those Nano terminal shields are a great find. They not only reduce the number of solder joints requ..." | Read more » | over 7 years ago | |||
| EdMallon | "Hi Warren, I think that would be a good idea for the screw-terminal logger, as it's a generic, and would provide people with lots of flexibility to..." | Read more » | over 7 years ago | |||
| warren | "@warren awards a barnstar to EdMallon for their awesome contribution! " | Read more » | over 7 years ago |