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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?