Rivers, oceans, lakes, aquifers, groundwater, stormwater, urban canals, underground streams, estuaries, and more -- we are passionate about water quality! This page will help you find resources to explore the waterbodies you care about, and connect with other people who have the same interests: ### Questions on Water Quality: [questions:water-quality] **** ## Monitoring * [Water sampling](/water-sampling) * [Water sensors](/water-sensors) * Posts on #water-monitoring * Posts on #water-testing * Posts on #reagents ## Water quality parameters Read about different water quality parameters here, including pH, nitrogen, conductivity, temperature, ORP and turbidity: * https://publiclab.org/common-water-contaminants Also see this overview of 7 ways to monitorn water quality: * https://publiclab.org/notes/anngneal/12-08-2017/7-ways-to-measure-monitor-and-evaluate-water-quality ## Groups and projects working on water quality issues: [wikis:project:water-quality] **** ## Water quality related pages [wikis:parent:water-quality] **** ## Activities [activities:water-quality]...
| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| kinasmith | "I am also very curious how much temperature affects the batteries in very low current applications. I haven't found good documentation about that. ..." | Read more » | over 8 years ago | |||
| cfastie | "This is probably not the best data set to do calculus on. The air temperature data is from a sensor in a jug suspended above the pile, and the batt..." | Read more » | over 8 years ago | |||
| donblair | "Yay, data!! Neat observation about the battery voltage and the temperature. Makes me want to compare the rate of battery voltage drop to the temp..." | Read more » | over 8 years ago | |||
| kinasmith | "Nicely done, and nice temps for such a small pile too! I'm curious to see how long they can sustain that heat. I've done some work with compost in ..." | Read more » | over 8 years ago | |||
| david-days | "I imagine so (regarding the grass). If it's fairly fresh, there's probably enough water content to feed the bacteria as things break down. We use..." | Read more » | over 8 years ago | |||
| cfastie | "Thanks David, I wish I had some of your manures to spice up my pile. I'm surprised at how hot this pile is without the addition of any N-rich mater..." | Read more » | over 8 years ago | |||
| david-days | "Excellent work, @cfastie! I live on a farm in Ohio, and we use cleanup from the chicken house and the horse/goat barns to make our compost piles. ..." | Read more » | over 8 years ago | |||
| cfastie | " I kinda like the switch on the Riffle and now I know that it is something to pay more attention to. But I guess it adds much more complexity that ..." | Read more » | over 8 years ago | |||
| donblair | "Chris, This is such a beautiful project! The lapse rate calculation is so fun to see. Quick reactions: That power switch goof is annoying. I w..." | Read more » | over 8 years ago | |||
| GSan | "Hi @mathew, thanks for contribution!! I performed the test making yogurt in 43⁰C Was completed in two hours ... dont require much effort of the eq..." | Read more » | over 8 years ago | |||
| mathew | "Real cool. I recommend putting a GFI (Ground Fault Circuit Interruptor) in front of any electronics project that plugs into a wall, for safety's sa..." | Read more » | over 8 years ago | |||
| ggallant | "D5 appears to connect the INT/SQW on the RTC to PD5 on the CPU. I would be very interested in how one uses the feature. I'm assuming that it requir..." | Read more » | over 8 years ago | |||
| mathew | "The RTC can be set to shutdown and wake the AT328P, it just uses another pin that could be used for a sensor. @donblair left an exposed pin availa..." | Read more » | over 8 years ago | |||
| ggallant | "Chris, I really don't know the actual time but assuming 800usec (nice for the math) to sleep and wake up it would be 800 / 8,000,000 or 0.01% whi..." | Read more » | over 8 years ago | |||
| cfastie | "George that's a good point. Although the real time clock is running all the time, it is not smart enough to do something as complicated as setting ..." | Read more » | over 8 years ago | |||
| ggallant | "I think 8 seconds is the "maximum" interval with a 16MHz crystal. You wake up every 8 seconds and can go back to sleep if there is no work to be do..." | Read more » | over 8 years ago | |||
| cfastie | "Don thinks that eight seconds might be the minimum interval during which the system can be put into deep sleep. So all the sleep stuff happens in m..." | Read more » | over 8 years ago | |||
| ddileona | "Cool! One question: I thought I read in the riffle documentation that you could only log in multiples of 8 seconds. That seemed liked a weird mult..." | Read more » | over 8 years ago | |||
| cfastie | "Thanks Bob, that's encouraging. My bricked card just gets hot to the touch when I put it into a card reader. I don't have much hope for it. " | Read more » | over 8 years ago | |||
| Bob | "While working on my Riffle beta datalogging program, I also corrupted the micro SD card. The Riffle was no longer able to initialize the card. Stra..." | 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 | |||
| mathew | "Minnesota DEP maps: " | Read more » | over 8 years ago | |||
| cfastie | "Hi Gretchen, I also wondered whether the change in logging frequency was caused by the Riffle dropping below 0°C. There is more about that possibi..." | Read more » | over 8 years ago | |||
| gretchengehrke | "Interesting! At first I was wondering if the change in time-step occurred after the Riffle reached 0 deg-C, but then when I looked at your data tab..." | Read more » | over 8 years ago |