Home › Forums › Environmental Sensors › SDI-12 Change Address for Meter Hydros 21 CTD Sensor › Reply To: SDI-12 Change Address for Meter Hydros 21 CTD Sensor
Yes, the board seems to perform just fine while only 1 card is inserted. There are most definitely electrical irregularities when 2 cards are in at the same time! I had erroneously assumed that the horizontal card was for uploading sketches and that data would be logged to the second (vertical) microSD card, which could be extracted easily to download data. There were no details in the Mayfly Manual explaining this aspect of the board. From now on I will just use 1 card on the vertical port. Thank you for helping me troubleshoot.
As for my original question about the SDI-12 address change for the Hydros 21 – is the data pin #7 and power pin #22 on the Mayfly? I could not find any details on this either. I am assuming it is, since it was in the EnviroDIY sample sketch, but I figured it would be wise to verify.