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XIngong Li became a registered member 2 years, 1 months ago
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Fernando Rojano became a registered member 2 years, 1 months ago
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neilh20 replied to the topic Hydros 21 CTD sensor calibration question in the forum Environmental Sensors 2 years, 1 months ago
@rogers1313 – its a good “engineering question”. speaking as an electrical engineer and some one that has blogged on understanding traceability, measurement range, measurement resolution. measurement accuracy and total error band of measurement being different aspects of the measurement.
In short the Hydro 21 has calibrated measurements th…[Read more]
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RogerS started the topic Hydros 21 CTD sensor calibration question in the forum Environmental Sensors 2 years, 1 months ago
Please help to clear up my thinking about these sensors.
This has probably been asked before, but after searching thru the forum I am not finding answers to this question. We have the Hydros 21 CTD sensor. It looks like this sensor is calibrated at the factory and the sensor reports engineering values to the Mayfly datalogger.
Is this ass…[Read more]
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Curtis DeGasperi became a registered member 2 years, 1 months ago
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John replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years, 1 months ago
Ah! Some pieces are coming into clearer focus.
Thanks!
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Shannon Hicks replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years, 1 months ago
The only difference between the Gen 1 and 2 Hydros21 sensors is that the Gen 2 sensors need a little more time to respond to the SDI12 measurement command, which is hardcoded into one line in the MeterHydros21.h file within the ModularSensors library. If you’re using the most recent version of ModularSensors, then your code will support both…[Read more]
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John replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years, 1 months ago
Thanks, Shannon. I think I get it. 🙂
Just out of curiosity, is this new? Or is it something that just became an issue because of trying to run the two different generations of sensor that way? It was working fine with the two Gen1 sensors written as it is. I suppose I’m trying to figure out if I just got lucky originally.
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Shannon Hicks replied to the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years, 1 months ago
From the sketch, it looks like you’re trying to operate both sensors on the same logger by using a separate data pins for each sensors? That’s not the correct way to do it because of how the underlying EnviroDIY SDI12 library functions. You should instead put both sensors on the same data line (usually D7). Each sensor will need its own unique a…[Read more]
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John started the topic Problems with a combined MH21 Gen1 and Gen2 station in the forum Mayfly Data Logger 2 years, 1 months ago
Hey all.
I have a station that started out with two Gen1 METER Hydros 21s and has transitioned to having one Gen1 and one Gen2. Unfortunately, I can’t seem to get the sketch to work now even though it was before. It compiles and uploads to the card, and the Gen1 sensor does just fine but I get -9999 from the Gen2 now that it’s installed. Whe…[Read more]
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Abigail Heath became a registered member 2 years, 1 months ago
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Shannon Hicks replied to the topic Turbidity Sensor Information/Questions in the forum Environmental Sensors 2 years, 1 months ago
The old Campbell OBS3 turbidity sensor was an analog-output sensor that had 2 separate voltage outputs, one 5v power supply wire, and 3 ground wires, which is why I designed the old version of the 6-pin screw terminal board that way, because we primarily used it with the OBS3 sensors and connected it to one of the Aux Analog Grove jacks on the…[Read more]
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Heather Brooks replied to the topic Geographically Scaling Modular Sensors in the forum Mayfly Data Logger 2 years, 1 months ago
Hi Neil! Jumping in here to explain as site admin to explain about link limits. You’re correct: a common characteristic of comment spam is a large number of hyperlinks. That said, you should be able to post up to 15 links before your post is held for moderation. If you’re finding that’s not the case, please email webmaster@stroudcenter.org so that…[Read more]
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neilh20 replied to the topic Geographically Scaling Modular Sensors in the forum Mayfly Data Logger 2 years, 1 months ago
Some other links .. I’m trying four links to see if it passes the spam filter ..
https://github.com/neilh10/ModularSensors/wikihttps://github.com/neilh10/ms_releases/wiki
https://github.com/neilh10/ms_releases -
neilh20 replied to the topic Geographically Scaling Modular Sensors in the forum Mayfly Data Logger 2 years, 1 months ago
@rogers1313 great to hear of your project from the technical questions thread.
This thread on scaling may be of interest.
I just posted a lot of links for scaling systems, and I forgot that enviroDIY doesn’t allow too many links in messages. (spam protection I guess).
I’m scaling some systems for Tu N California, soley stage gauges at…[Read more] -
RogerS replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 2 years, 1 months ago
Thanks for the quick answer, too.
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RogerS replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 2 years, 1 months ago
Thanks for the great answers. These are really helpful. There are so many things to dig into with this system. It is easy to miss some of your notes and instructions. I am finding that it requires a lot of deep diving into information. I am trying to build a process for our folks to follow that will be simple to understand. There a…[Read more]
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Shannon Hicks replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 2 years, 1 months ago
As Neil mentioned above, the yellow LED that is labeled SOLAR only indicates when a charge current is being applied to a battery, so if a battery if fully charged (~4.2v), the LED will not be on. The charging circuity of the Mayfly v1.1 boards is configured so that the solar panel provides voltage directly to the Mayfly’s main power regulators…[Read more]
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neilh20 replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 2 years, 1 months ago
@rogers1313 my systems only have the Yellow led ON when actually charging. If the battery is charged, not charginng then it is OFF. The description in “Section S”, beneath the pics https://www.envirodiy.org/mayfly/hardware/details-and-specs/ says
A yellow LED (labeled CHARGE) will light anytime the battery is being charged. Once a battery is…
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RogerS replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 2 years, 1 months ago
When I first received the Mayfly V 1.1 a few weeks ago, I hooked up the all of the connections: Battery, Solar Panel, and sensor. Everything worked fine. Over the last week I have noticed that the yellow solar charging LED is not lit when the Sun is out. However looking at the CSV generated file the voltage is higher like the panel is cha…[Read more]
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