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Hello, my senior project team at Lake Superior State University is using the Mayfly board with the Hydros 21 CTD sensor.

We are using the ModularSensors library and we’re wondering if there is a power cycle taking place that could affect any serial communication. There are no issues with communication or connection when sending data from the…[Read more]

I’m not familiar with the new C model, but I did use the older, now-discontinued one awhile back.  Without digging into the manual and the library too deep, I’m guessing it might be an I2C address issue?  The old model used 0xB8 whereas the new one uses 0x38.  So go into the ModularSensors/src/sensors folder and edit AOSongAM2315.cpp, find line 34…[Read more]

Hi!

I was hoping to piggyback on this thread since I am having a similar problem with the clock sync and LTE connection. I am also working with a 1.1 Mayfly model with LTE Bee, hologram, and a Hydros 21 CTD sensor.

So far I have tried several locations with full LTE coverage through AT&T, reprogramming the Mayfly to make sure all changes…[Read more]

This looks like a great option. Thanks Shannon for your help!

That’s not much current, so most relay boards should be able to handle that with no problem.  I think that latching Grove board (https://www.seeedstudio.com/Grove-2-Coil-Latching-Relay.html) would probably work good for your situation so your Mayfly board could activate the relay 15 minutes before you want to sample, and then go back to sleep and…[Read more]

I have four sensors with heaters, and combined they draw 61.6 mA.

What’s the current draw of your heaters?  There’s a variety of relays you could use, but I know several people have had good luck with various Grove-compatible relay boards, like the ones from Seeed.  But your options are going to depend on how many amps of current the heater draws from the battery.

I am trying to update a data logger which was using Arduino Mega+SD reader and us Arduino GiGA R1 in order to monitor it remotely, but SDI-12 library is not working on the new Arduino GIGA board, Is it possible to use your fix to update the library for this set up?

Could you please look at porting the code to the new Arduino R4 UNOs?  They use a different chip (Renesas RA4M1 (Arm® Cortex®-M4)), and I cannot get SDI-12 code to compile for those board definitions.

I am also working through the learn EnviroDIY course (amazing resource and really thorough!) and having the same issues as letsid. I have tried the pio lib install to no avail. Any ideas of things to try next?

I was actually having trouble with both. It is now working with the onboard socket.

Hi @braedon-dority, my take is that the first step is to have personal documentation to be able to repeat your work, and that you can read it. Just to be basic, part of the learning is how to do documentation that you can then read your self.

Personally I find I come back to a working sensor some years later – and then want a traceable reference…[Read more]