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The ATmega1284P processor of the Mayfly is similar to other basic Arduino boards with the 324P processor in that it has an internal 10-bit Analog-to-Digital converter (ADC).  There are 8 ADC pins on the 1284P, so these pins can be used to read analog voltages, however at a pretty coarse resolution (1024 bits over the 3.3v sample range).  But t…[Read more]

@dan-wachusett Gosh just seeing this – seems like you got that Keller CTD.

Just wondering did you follow the advice given from https://www.envirodiy.org/topic/keller-ctd-sensor/#post-16332

Partly its decoding the layers of software. The keller protocol is used to access the Keller CTD map. I find it most helpful to compare and trace how…[Read more]

How do the analog pins found on the 20-pin header (pins A0, A1, A2, etc.) differ in function and purpose from the auxiliary analog pins (AA0, AA1, etc.)? From what I’ve seen, you need to connect analog sensors to the auxiliary analog pins and use an Adafruit library to get the millivolt readings because of an ADC they are connected to. I’ve…[Read more]

Some recent posts here explain the current difficult environment for calculating power usage on the mayfly as its dependent on a fast response from the server.

https://github.com/ODM2/ODM2DataSharingPortal/issues/649#issuecomment-1561690674

My implementation is to ensure that there is sufficient reservoir of power in the battery for taking…[Read more]

There’s nothing to unsolder.  Solder Jumper SJ25 has 2 small pads.  By default, they are separated and not connected at all, and that makes the on-board boost circuitry output 12 volts.  By putting a solder blob on SJ25 and connecting the 2 pads, you add some extra resistance to the circuitry that controls the voltage and it’ll output 9 volts in…[Read more]

For clarification, 9 volts is stable – which requires de-soldering the 12 volt bridge and re-soldering the 9 volt bridge correct ? In the event all 3 soldering points are connected by accident what will the results be? Is there voltage protection or will it burn out the board?

Have you tried disconnecting one sensor at a time and seeing how the other one performs?  We’ve found that sometimes when one sensors fails or “goes bad”, it can cause erratic readings or performance of any other sensor that’s also connected.  By unplugging each sensor independently, it’s usually easy to isolate which sensor was the actual c…[Read more]

Is it a Mayfly 1.1 revB board?  or a revA?  That station seems to not have the usual 4.3v during the day that most v1.1revB boards get, and is more similar to the voltage one sees on a v1.0 or v1.1revA board.  What solar panel do you have on that station, and is it in a very shady location, or is the panel pointed north?

All that being said, di…[Read more]

https://monitormywatershed.org/sites/RHA03/

Again, there are readings sometimes throughout the day, but then not. So I’m not sure what is going on here.

-9999  is not an actual reading from the sensor, it’s what the Mayfly stores as the value when it doesn’t actually get a valid number from the sensor.  You’d see the same thing is no sensor was attached to the Mayfly at all.  What is the MMW station name or URL?

Well, I’m back at my desk, with a Mayfly and powered it up, and I’m posting to

Host: monitormywatershed.org

and getting

— Response Code — 301 waited  326 mS Timeout 8000

If I change it to

Host: data.envirodiy.org

— Response Code — 201 waited  577 mS Timeout 8000

From   https://github.com/ODM2/ODM2DataSharingPortal/issues/542

aufdenkampe …

[Read more]

Thanks for the input, Dan@wachusett.  I think I figured out my problem – it was the bubbles in the stream as you can see in the attached photo when I was co-locating two sensors! I moved the sensor probe about a foot to calmer waters and now the results look normal.

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]

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