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Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, an initiative of Stroud Water Research Center designed to help people advance knowledge and stewardship of fresh water. 
Community Activity See all activity
nick replied to the topic Continous HAB monitoring in the forum Mayfly Data Logger 1 year, 6 months ago
<p style=”text-align: left;”>I’m just connecting one Turner phyco c-flour sensor.</p>
I assume these resistor pairs are independent and shouldn’t affect how a single sensor reports.
<p style=”text-align: left;”>Thank you for the previous response regarding the cable glands.</p>
Shannon Hicks replied to the topic Continous HAB monitoring in the forum Mayfly Data Logger 1 year, 6 months ago
Are you trying to measure 2 analog signals from 2 separate sensors with just one 6-pin screw terminal board?
nick replied to the topic Continous HAB monitoring in the forum Mayfly Data Logger 1 year, 6 months ago
Shannon, I went ahead and soldered four 10k resistors instead of the two I originally said, similar to what you did here:
Does that still work for my purposes or does it change things?
Thank you.
Shannon Hicks replied to the topic Logger not transmitting data to website in the forum Mayfly Data Logger 1 year, 6 months ago
That happens occasionally when the connection between the Mayfly and the online time server gets terminated before the entire timestamp gets transmitted, resulting in an incomplete timestamp, and the Mayfly code has some smarts to check whether the timestamp it received is a valid, reasonable date. If you ever get this error, you can just…[Read more]
Jamie Anderson started the topic Logger not transmitting data to website in the forum Mayfly Data Logger 1 year, 6 months ago
I have a new logger that is recording data to an SD card but I get the below error and the logger will not transmit to the website.
“Current clock timestamp not valid”
I used this sketch: https://github.com/EnviroDIY/ModularSensors/blob/master/examples/DRWI_SIM7080LTE/DRWI_SIM7080LTE.ino
neilh20 replied to the topic Hydros 21 Depth/Conductivity During low temps in the forum Environmental Sensors 1 year, 6 months ago
Hi Jake, no “pressure sensor” is going to be able to be linear/accurate if ice is forming and expanding in the protective enclosure round the pressure sensor. My guess is the whole sensor would have to be specially designed to allow for the ice expansion to even survive a freezing event.
My hypothesis (guess) would be that its the nearly…[Read more]
Jake Lemon replied to the topic Hydros 21 Depth/Conductivity During low temps in the forum Environmental Sensors 1 year, 6 months ago
Thanks for your thoughts Neil.
These blips are occurring over the course of hours (roughly 4-6 hours from when depth starts dropping until it reaches it’s lowest point) though the time varies by occurrence.
They seem to be happening as temperature approaches the freezing point. I’ve attached a graph with temp for reference.
AdrienneBP became a registered member 1 year, 6 months ago
AdrienneBP
@abreefpilz
neilh20 replied to the topic Hydros 21 Depth/Conductivity During low temps in the forum Environmental Sensors 1 year, 6 months ago
I wonder what the water temperature is, or if there are water temperature changes, when this is happening.
From the graph it reads the water level is at 20″ depth then on the 10th Feb it drops by up to 5″ for some time (hours?) before recovering, with 3 other similar but not us pronounced events
IF any for of ice could build up in a pressure…[Read more]
Jake Lemon started the topic Hydros 21 Depth/Conductivity During low temps in the forum Environmental Sensors 1 year, 6 months ago
Hi All. We’ve been seeing some strange depth and conductivity trends at a few of our sites. Quick drops in depth over a short period of time with a quick bounceback. See attached screenshot example. This occurred on the same days at multiple sites on different streams, but in the same region. At one site, conductivity dropped a bit at the same…[Read more]