[fisherba]

What software are you using to connect? What are you doing to confirm that it isn’t connecting? Are you trying to upload a sketch, or are you looking at it through a serial monitor?

Have you confirmed the com-port? A PC will number the com ports sequentially (a new port for every Mayfly you connect). A Mac will have a long string assigned to the port that will include USB somewhere in the string.

[fisherba]

Hi Dave,

Don’t kick me for this, but is the Mayfly turned on? There’s a little toggle switch near the USB jack.

Sometimes they do get “fried” and others know the trouble-shooting steps better than I do, but I see users missing the on-off toggle a lot.

Beth

[fisherba]

I had a hunch that it was a no-go, but I thought I’d ask. I’ll just log to the SD card for in-lab monitoring. And for workshops we will use hotspots.

Thanks!

[fisherba]

@shicks have you read their current product specs? Don’t take my word for it.

[fisherba]

The sensors the student ordered have the stereo plug and a red cable.

@neilh, we have a calculated temperature compensation in Modular Sensors if you ever need it. It’s extremely negligible in groundwater temp ranges.

@mbarney, the Meter discrepancy is a bit annoying. Was your March order a bare wire or stereo plug?

 

[fisherba]

There’s an example sketch in the Modular Sensors GitHub Repository with a calculated variable correction for water temperature (really it’s density, so it’s called rho and density in the sketch) that uses data from a temperature sensor. The same sketch has a calculated barometric correction.

https://github.com/EnviroDIY/ModularSensors/tree/master/examples/baro_rho_correction

 

[fisherba]

In addition to what Sara said (she’s the best!) about the UUIDs for the station when I’m doing that many stations at once I easily also miss an occasional apn = “hologram”.

If the code all checks out, I second the experience that it’s strange how sometimes it takes way longer for one or two modems to connect, even when things are from the same batch. I often let them run for a lunch time and come back to see if they connected.

And if I think it all should be right, I shut it all down and reseat all of the modem and battery connectors (not the coin battery). Then I scrutinize the Hologram data for each card, confirm that it’s the one on the station, etc.

 

[fisherba]

If it’s a Windows device each Mayfly will be assigned a different COM port number. Maybe you knew this but that’s the best I have with what you are saying. It’s promising that they connect.

(I mean, there’s also the is the Mayfly turned on step…)

[fisherba]

Are you working through a tutorial to learn how to do this? Here’s a link to some tutorials. https://www.envirodiy.org/mayfly/software/

If you are just getting started with Arduino, I recommend starting in a generalized Arduino tutorial (not monitoring focused): https://learn.adafruit.com/series/ladyadas-learn-arduino. Here are directions through that Lada Ada tutorial with parallel information on the Mayfly: https://envirodiy.github.io/LearnEnviroDIY/01-ArduinoBasics/index.html

 

[fisherba]

Try uploading a basic blink sketch using the Arduino IDE. I’m not sure from your description if the board even could be fried from what you did, but going back to something really basic would test this.

 

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