Shannon Hicks

I successfully used that sensor with a Mayfly v0.5 board with no problem.  If you’re powering the sensor with a separate 12v battery, do the Mayfly and the 12v battery share a common ground?  The white wire from the sensor is the SDI-12 data line, which should go to pin 7 , as you stated in Line 93.  It’s fine to use a separate battery to pr…[Read more]

I’d have to see the rest of your sketch to know what you’re trying to accomplish with the 5v output.  If you put the CTD sensor on the D4-5 jack, and move the jumper to constant 3.3v, then the SDI12 power pin part of the code doesn’t really matter, but that kind of stuff gets declared early in sketch, usually in the setup function.  The bigger p…[Read more]

The Hydros-21 sensor already does internal temperature compensation of the depth data, so you shouldn’t have to provide your own compensation.  The sensor outputs the depth readings in millimeters of water above the sensor, so you don’t even have access to the raw pressure readings like you might with a basic pressure transducer, so you’d have to…[Read more]

What’s the duration of the 5v signal you want to generate?  And how much current does the 5v actuator draw?  Pin D22 controls the switched 3.3v and 5v outputs together, so there’s no way to separate the two.  However, a Hydros-21 CTD sensor uses very little current when it’s constantly powered, so you could plug the CTD into the D4-5 Grove ja…[Read more]

I’d need to see the rest of your sketch to make sure everything else is set up correctly for reading the sensor properly.  Can you post your entire sketch, and tell me what version of the Modular Sensors library you’re using, and when you downloaded the other recommended supporting libraries like the EnviroDIY_SDI12  library?

Does your Modbus wingshield do any level shifting of the CTD’s SDI-12 data line?  Is there anything on the wingshield tied to whatever Mayfly pin you’re using for the data line (I’m assuming D7)?

We sell a 5-pack of the vertical microSD card adapter in our online shop:  https://www.envirodiy.org/product/envirodiy-vertical-microsd-card-adapter-pack-of-5/

We only ship to US address though, so you’ll have to figure out a mail forwarding service for Canada.

That said, there’s already an onboard microSD card socket on every Mayfly that does…[Read more]

The EnviroDIY Mayfly Data Logger board is unlike standard Arduino boards (like the Uno) in so many ways that there was no easy way to use the regular Arduino board pinouts on the Mayfly.  So that means accessory boards that are meant to plug into a standard Arduino board will not work.  I’m not familiar with the isolator boards used with Atlas S…[Read more]

It depends on what kind of pinout is on the adapter board.  I’m not familiar with them since I don’t use them, but you could probably make a test jig with pogo pins, or if the board have plated-through holes you can simply use male header pins and just hold the board at a bit of an angle to  make contact.

Yes, I’ve read the website, and talked with the Meter Group engineers on many occasions.  I think the wording on the simplified product brochure just isn’t written clearly.  If you read the detailed Integrator’s Guide, you’ll see that it says this:

Differential pressure measurement referenced to atmospheric pressure so no external pressure s…[Read more]

Sounds like a manufacturing error to me.  I’d suggest contacting Meter and tell them about it because I’ve never seen an unvented CTD from them and there’s no conceivable way it would work correctly without one.

Yes, the pressure transducer on the Gen 2 sensors seems to be temperature compensated just like it was on the Gen 1 sensor.  They also use the temperature sensor for calculating the specific conductivity readings.  I wasn’t going to mention that I have one since they sent it to me ahead of release for testing so we could make sure our Modular S…[Read more]

Matt,  they haven’t begun selling the Generation 2 CTD sensor yet, so what you have is a Gen 1 sensor with the new cable on it.  And we always order our sensors without the metal strain relief since we always end up cutting them off anyway, so you can specify that when you place your order.

Are you using a sensor with bare wires at the end, or with the molded stereo plug?  Is it a red cable or a black cable?  We’ve bought hundreds of CTD-10 and now the Hydros 21 sensors (only the name changed when the company changed from Decagon to Meter, and there was no design change).  Every one we’ve ever used has a small Gore-Tex sleeve ab…[Read more]

Some features of MMW are still down due to some complex server issues.  They’re still working on it but haven’t given a specific date when everything might return to normal.

The database still has some issues with sparkline plots and a few other things.  The team is still working on it but don’t have an estimate on when things will be back to 100% functional again.

We just got the sensor and haven’t done any comparison tests alongside the Gen 1 sensor to see if there’s a difference, so I can’t comment yet on anything data-wise, we just know that there’s not a communication issue with the Mayfly now that we’ve adjusted the timing of the commands in our library.

We recently received a Gen 2 Hyrdos 21 CTD sensor from Meter Group and have confirmed that it works just fine with the Mayfly Data Logger, and using our Modular Sensors library, with just a very small adjustment made to the library.  We’re in the process of updating that now, so you should be good to order them and use them when they arrive.

Monitor My Watershed is still down and not showing stations on the main page when you click “Browse Sites”.  The data team is still working on repairing the site. But don’t worry, data is still being collected and all of it is available if you know the site code for the station you’re interested in.  For users that have their own sites or are f…[Read more]

Yes, it’s been down most of the day.  The MMW data team is working on it.