• Register
    • Login
    • Search
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Search

    1wire sensors returns 85°C or "null"

    Official EVOK API
    2
    5
    1919
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • roberts_lando
      roberts_lando last edited by

      I have two 1wire sensors connected to an hub. They work for a while but sometimes one sensor (not both) start send 85°C or both become null and than they stop send right values once they become null.

      How can I fix this? What could be the problem that causes this?

      I'm running evok on port 8080, Emoncms on port 80 and Node-Red on port 1880.

      1 Reply Last reply Reply Quote 0
      • roberts_lando
        roberts_lando last edited by

        One more info: after sensor start send null values I need to restart evok service than they start work again correctly.

        T 1 Reply Last reply Reply Quote 0
        • T
          tomas_hora administrators @roberts_lando last edited by

          @roberts_lando The 85°C is a Power-On-Reset value, which the sensor is sending between powerup and the first measurement. Check all your connections and make sure to follow the guideline https://www.unipi.technology/hardware_documentation/1-wire-network-46

          Could you describe how your 1wire network looks like - how many sensors, what are the lengths...

          1 Reply Last reply Reply Quote 0
          • roberts_lando
            roberts_lando last edited by

            I'm using two 1wire temperature sensor connected to an hub, both are 3 meters long.

            T 1 Reply Last reply Reply Quote 0
            • T
              tomas_hora administrators @roberts_lando last edited by

              @roberts_lando Do you have the possibility to check the RJ45 connectors of the sensor or better make a new ones?

              1 Reply Last reply Reply Quote 0
              • First post
                Last post