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No address detected for any sensor

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    • 2026-01-23 at 12:59 PM #19494
      okamran
      Participant

        I currently have my Mayfly board set up with a Hydros 21 water depth sensor and a ClarityView 10 turbidity sensor. I’ve been trying to use the Arduino data logging sketches to record data and upload it to the monitoring component of our watershed database.
        During testing, I’m able to see valid data from the ClarityView sensor, but the Hydros 21 is consistently reporting -9999 for all values. Additionally, when I run the address change sketch, neither the ClarityView nor the Hydros 21 sensors appear.
        I’m not sure why this is happening, as I’m fairly confident that all wiring and connections are correct. Any guidance or troubleshooting suggestions would be greatly appreciated. I’ve linked photos of my setup and the sketches I’m using below

        Attachments:

        1. IMG_1577-scaled.jpeg

        2. IMG_1578-scaled.jpeg

        1. b_address_change.ino
        2. DiVitWaterSensing.ino
      • 2026-01-23 at 1:07 PM #19499
        okamran
        Participant

          Oh also forgot to mention that I’m fairly certain I’ve switched the meter hydros 21 factory address away from 0 in the past.

          Attachments:

          1. IMG_1579-scaled.jpeg

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