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David Lutz

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    • #15933
      David Lutz
      Participant

      A small update for everyone:

      We were able to allow the Mayfly to operate by updating the libraries in our code. We are using some core IDE libraries as well as some EnviroDIY libraries. My sense is that there might be a conflict between the recent update to the SD library, and perhaps a pin interrupt library from EnviroDIY, but I’m not sure.

      One particular clue is that for the mayflys that are not operating when connected to the battery, their RTC clock is also not operational. So, when we pull the SD card, not only is there no file written, but when we check what is written to the serial, the RTC is still set to the date we initially set it in August.

      I’m not sure if Shannon or Sara have any insights into possible issues with library updates and SD card functionality. It writes to the serial when connected to a computer, but just won’t initialize the txt file to write to the external file on the SD.

      Dave

    • #14256
      David Lutz
      Participant

      Hi everyone,

      Some updates on this project – we now have 12 loggers monitoring 8 sensors at each site. It took a full field season but now have all the wiring free of shorts and power problems. We have mostly been focused on the data collection side and, because of COVID, don’t have resources to work solely on the 900Mhz radio network element quite yet – we had some success transferring data along the network, but path loss did not allow us to collect from all nodes in the network.

    • #14255
      David Lutz
      Participant

      Wow! That is amazing – and very helpful! I thought it may be an issue with a line in the library – we migrated to Meter group sensors which seemed to work – perhaps because of their ability to wake up more quickly.

    • #14254
      David Lutz
      Participant

      Thanks for the update Shannon – we have 12 out in the field for collecting soil moisture in a project with the USFS – I should probably update that thread. We are looking to buy 15 more for installation in Vermont now, too.

      One cool piece of info for you all is that the Mayflys we had installed over-winter in northern NH made it through -20F temperatures outside their casing. We had a deep cycle battery and solar panel and they capture soil moisture dynamics during winter/spring transition – the first time that has been documented.

      A broader question – would Stroud/EnviroDIY like info on how we are using these devices as part of research work? I imagine it may help SWRC’s outreach efforts?

    • #12801
      David Lutz
      Participant

      Greg,

      We never revisited the issue and instead just gave the address to the CS-215 via a CS logger. I know that our team installed an ATMOS-14 at the site, and got around power issues by just powering the sensors separately from the Mayfly board by using DIN rails. It really seems that the different power requirements between the board and the sensors don’t allow for easy address updating and connections.

      That said, I am also working on a project where we are going to be using some hydrological sensors and making sure that the Mayfly will work with a YSI sonde is pretty important. I wonder if Sara may have more insights?

      Dave

    • #12782
      David Lutz
      Participant

      Hi everyone,

      Very quick question. Something I didn’t see listed in the above replies has to do with antenna selection. Anthony or Sara, do you have a recommendation as to an antenna for one of the new Digi LTE-M Xbee3’s? We have had really good success with the 900mhz xbees and are now working on projects where there is cell service, so we’re exploring these new options.

      Sincerely,

      Dave

    • #12569
      David Lutz
      Participant

      Hi everyone,

      Just an update here. Due to the issues with the CS-215, we ultimately decided to go with the Meter Group’s ATMOS-41. It worked seamlessly with the Mayfly and our script and we had no issues with addresses or voltages. Seeing that it was relatively similar in cost, it was an easy decision. This evades the answer to the question, so this won’t be of help to those looking for how to use a CS-215 they may have lying about, unfortunately.

      Dave

    • #16046
      David Lutz
      Participant

      Shannon,

      We had been using the EnviroDIY Libraries as well as libraries contained within the IDE itself. Our code uses sections of the sample logger sketch, but have been built out a bit to combine possible analog sensors as well as communicate with Xbee.

      I’d be happy to share with you – it’s not super long and you’ll see that it is pretty simple.

      Another thought I had dealt with power supplies. I know the Mayfly has a 12V step-down in it. We have each of our stations connected to a charge controller linked to a solar panel and a deep-cycle marine battery so that our stations can operate even in the winter time. I wonder if power is entering at a voltage higher than 12V (low 14s) if this might cause an issue.

      A clue really does seem to be the RTC. When it is not operational and doesn’t retain the date/time, the Mayfly will not write. But we have brand new batteries in the RTC so that’s why we thought it could be a conflict in the libraries somehow?

      Dave

    • #15904
      David Lutz
      Participant

      That’s a good thought – the only thing is that we have the identical setup nearby that we installed in November with the exact same battery and solar panel, and those function with no problem. We don’t believe there is a difference in the physical infrastructure that we can tell – so the only difference could be what libraries we installed?

    • #12611
      David Lutz
      Participant

      Shannon,

      This is very helpful! We’ve ordered a few XBee PRO S3B 900 modules but are having trouble getting them to communicate via the Mayfly script.

      One thing we think may be a problem is whether or not we chose the ‘programmable’ version of the modules. I noticed that Scott had an issue with this in another post from earlier in the Spring, and that he just purchased non-programmable XBees and the situation resolved itself. I’m willing to just purchase those if that makes the difference, but figured it was worthwhile to ask you to see which versions of the 900 modules you had been using successfully.

      One thing we’re also not convinced we are doing correctly is adding the proper libraries to the simple sketch you posted before (here). I don’t see any libraries in that and think that also may be an issue.

      Do you have any suggestions?

      Dave

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