dan@wachusett

@neilh20

Yes, I did get the Keller CTD. We had the budget and I was able to get an extra Hydros21 to deploy while figure out the Keller CTD. It took me a while to get the parts for the Modbus Wing shield and then build it, but I finally got them and had time to do it… so now I am in the thick of it.

I did follow instructions from the post you…[Read more]

Jim,

I have seen similar fluctuations in some of the streams where I have Hydros21 sensors. Typically, step changes > 100 µS in 5 or 15 minutes only occur during runoff/snowmelt events. In the winter, after a snow event with road salt application and subsequent melt I have seen > 2,000 µS fluctuations in 15 minutes as the salt pulses work their w…[Read more]

Matt, I did see that thread about the SIM and APN details, and have no doubt that the modems will work. The trouble is that our Verizon rep (as of January 2023) does not see the EnviroDIY modem IMEI numbers in their device database, therefore they will not “activate” them on our plan. We have SIM cards operating on the Verizon network now using…[Read more]

Thanks for the quick reply Sara. I might be willing to use jumper wires, but realistically, I lack the time and expertise to figure this out on my own in the near term. If someone else has done this and wants to share a fairly detailed how-to, I could probably follow along.  I may circle back on this at some point in the future, time permitting.

@shicks, has anyone from Stroud contacted Verizon about this? I am also hitting a wall with adding the LTEBee modem to our Verizon account. The rep from Verizon that we work with is willing to speak with the device manufacturer to get them added to the Device Management Database. How do the LTEBee modems differ from the Digi modems such that…[Read more]

Is there any updated timeline on the RS-485 half shield production? The last update was about 6 months ago.

Thanks!

<div class=”bbp-reply-author”>@rogers1313</div>
<div></div>
<div>I have used the Hydros-21 for several years now and can add a bit to what Neil has mentioned. I also asked the engineers at Meter Group about temperature compensation and found their response unhelpful. My Hydros21 sensors output water depth that is highly affected by temperature (I…[Read more]

Neil/Anthony,

I think we will be able to purchase one Keller CTD this year and I will work on getting it going on the Mayfly 1.1 in whatever spare time I can find in my schedule. I appreciate all the input so far and I am looking forward to digging into this in the coming months. I will keep you both posted as I get going… I’m sure there will…[Read more]

Thanks for the advice Neil, I think you helped me figure out a path forward here. I have a stream with long-term monitoring data that I do not want to interrupt, so my inclination is to use a sensor that I know how to use (Hydros 21) and if budget/free time allows I would purchase the Keller CTD without being under any time constraints to get it…[Read more]

Thanks for the information everyone, I really appreciate it!

It sounds like RS485 is the way to go if I want to keep it simpler and use methods similar (hopefully) to the Acculevel 0r Nanolevel sensors. The RS485 interface only requires 3.2 V, so does this mean that no voltage booster/level shifter would be required?

The RS485 version would have…[Read more]

Thanks for your input Neil and Cal. I pulled my station from the field where the battery was not recharging so I could do some testing. I’ll report back with my testing results to see if anyone has any advice. I would still be interested in the 12 v battery option if anyone out there uses one successfully with their Mayfly board v 0.5.

I am experiencing a similar issue that may be related, although without the RTC issue…

• Built with Modular sensors v0.30.0
• Data is saved to SD card when connected to computer via cable. RTC time is correct (or close enough)
• If I disconnect the board from the computer it fails to wake up or log any data to the SD card
• Battery voltage is…

[Read more]

@vogelrnws, thanks for the digi link… this does seem like something that could work very well to send information to AWS from a XBee modem. There are still several steps to figure out in terms of getting a Mayfly program to execute the python code that is on the modem, perhaps like calling a function?, with the sensor data as the message…[Read more]