Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, a web toolkit designed to help citizens, conservation practitioners, municipal decision-makers, researchers, educators, and students advance knowledge and stewardship of fresh water. New to EnviroDIY? Start here


  • scornia replied to the topic Logging Mayfly with Decagon SDI-12 Sensor in the forum Mayfly Data Logger 1 year, 3 months ago

    Hi Sara,

    I am having issues when I come to this step and can use a little help troubleshooting my issue. I cannot get my sensor to connect to an address. I have an SDI-12 sensor with bare wires connected to grove 4-pin terminal adapter set up just as you explained in the instructions. All of the connections seem secure, but when I run the b_address_change sketch, it continuously runs through every slot saying “vacant” and gives the message “No sensor connected. Check physical connection.”

    I am not sure what the issue could be and was wondering if you may have any ideas.




    • scornia,
      In May I had this exact setup deployed and working. I used a WiFi modem and was logging to MMW. It slowly lost power because it was in too much shade and eventually I replaced it with a U-20 level logger. Now I’m working on this setup again and I’m having a similar issue to yours; the address change sketch just loops and my serial monitor returns -9999 for temp., cond, and depth. I don’t remember exactly what I did to get it working last time but I’m pretty sure I got the address changed to “1”, so I think I’m going to focus on that to get the readings to show up again. Let me know if you figure it out.

      Best Regards