[Shannon Hicks]

You can also try disconnecting the solar panel for a few days since you’ve got a fully-charged battery on it.  Then that’ll tell you if there’s any correlation between the sensor noise and charging activity.  On a few rare occasions, a failing solar panel ended up generating noise on CTD sensor data.

[Shannon Hicks]

You can also try disconnecting the solar panel for a few days since you’ve got a fully-charged battery on it.  Then that’ll tell you if there’s any correlation between the sensor noise and charging activity.  On a few rare occasions, a failing solar panel ended up generating noise on CTD sensor data.

[Shannon Hicks]

That’s a good find.  We haven’t tried one of those with the Mayfly boards yet, but we’ll have to buy one and see what all might be needed to get it to work properly.  Previous Digi boards required our now-discontinued bee adapter board to change the pin assignments and power supply options in order to work with the Mayfly v0.5 boards.   But the latest Mayfly boards give you the ability to change bee header pins and power settings by adjusting various solder jumpers on the back of the Mayfly.  Similar adjustments to the sketch would be needed as well to make sure everything matched up properly.  But we’ll order a few of those Digi modules and do some testing and if it all looks good, we’ll add an example sketch to the library.

[Shannon Hicks]

Have you been to the station to clean the sensor lately?  Also, I’d recommend replacing the logger’s battery with a fully-charged one.  Sometimes when those battery packs are starting to fail (from corrosion on the terminals under the plastic wrapper) they will generate noise which can sometimes affect the sensor readings.

[Shannon Hicks]

No, the Mayfly datalogger doesn’t know if any data is missing from the website, it just tries to send it every 5, 10, or 15 minutes (or whatever interval it is programmed for).  If the data doesn’t get to the website database, the logger won’t know, and doesn’t send any old data to fill in the gaps. You’ll need to visit the station and manually retrieve the onboard memory card to see what was recorded when the station wasn’t transmitting.  That visit also will give you a chance to clean the sensor and assess whatever physical problem might be causing the data outages.  My first guess would be a malfunctioning battery pack, so if you’ve got a spare fully-charged pack, swap that out when you swap out the memory card.  Then check the datafile to see what the battery voltage and cell signal strength are during the samples that weren’t transmitted.  You can also manually upload the datafile to MonitorMyWatershed and it will auto-fill in missing gaps.

[Shannon Hicks]

It’s probably easiest if you email me your code so I can check it.  We used 8 of those sensors for 2 years in a continuous deployment and didn’t have any drift or loss of calibration, so I don’t think there’s anything else you need to do with it.  If you’ve got another type of calibrated turbidity sensor or a turbidity standard, you could do a comparison to see if you’re getting similar results.

[Shannon Hicks]

I sent you some code last year that should work with the Y511-A.  I can’t tell what other changes you’ve made to the code, but in snippet you posted above, the address should be 0x01 on line 7, not 0x02.

[Shannon Hicks]

When you did the address changing sketch, did you get a positive result using the serial monitor that showed the channel was changed to something other than 1?  Sometimes there’s a glitch where you have to set the channel twice before the change actually happens and it stays on the new channel.

What sketch are you using for the logging sketch where you’re getting -9999 results from the sensor?  Is the sensor connected to the logger with a 3.5mm headphone jack, or bare wires and a screw terminal board?  Which grove jack are they connected to on the Mayfly?  What’s the voltage selection jumper next to that Grove jack set to?

[Shannon Hicks]

Did you do the example “b_address_change” sketch first, to change the sensor’s default channel from 0 to 1?

[Shannon Hicks]

They are actually Turner Designs Cyclops-7F sensors that we use for measuring chlorophyll and phycocyanin  (https://www.turnerdesigns.com/cyclops-7f-submersible-fluorometer).  They are supported by the ModularSensors library and there’s more information about them here:  https://envirodiy.github.io/ModularSensors/group__sensor__cyclops.html

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