REXYGEN Community Forum
    • Categories
    • Recent
    • Tags
    • Popular
    • Login

    1-WIRE Temp sensor unstable reading

    1-Wire
    2
    4
    1.5k
    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.
    • M
      MikeyH
      last edited by MikeyH

      Hi All,

      I'm wondering why I have erratic changes in temperature readings. The readings can jump anywhere from 0.3 to 0.8 of a degree at a time within a second, then back again. I would assume a 1-wire sensor with a metal casing would be a stable thermal mass.

      What could cause them to be so unstable? I have the driver set to 200ms execution. Another thing to note is the unstable sensors are around 0-3°C, the stable ones are around 18-20°C

      Cheers

      Mike

      1 Reply Last reply Reply Quote 0
      • jaroslav_sobotaJ
        jaroslav_sobota
        last edited by

        Hi Mike,
        never heard of such a problem. Please provide more information, namely:

        • What hardware are you using as the 1-Wire master? Monarco HAT?
        • How many sensors in total are you using?
        • How long is the wiring?
        • Can you try swapping the temperature probes?
        • Does the problem persist if you use fewer sensors? E.g. removing the stable ones temporarily.
        • How often does this happen?
        • Do you have a time plot showing the reported problem?
        • Any errors in the System log?

        Kind regards,
        Jaroslav

        1 Reply Last reply Reply Quote 0
        • M
          MikeyH
          last edited by

          Hi Jaroslav,

          I only had 4 sensors, and I am using the Monarco hat. The sensor cables are all 1.5m long is a star formation.

          I have ordered more as I think I had a bad batch. I have issues with the same sensors not working after a power loss.

          I will let you know more once I have tried the new sensors.

          Cheers

          Mike

          1 Reply Last reply Reply Quote 0
          • M
            MikeyH
            last edited by

            An update to the above. I'm now very sure I had a bad batch of sensors, it turns out I'm not alone. Over people have seen the same thing having bought sensors from certain websites.

            Be careful when buying 1-Wire sensors as it seems there are cheaper, not so reliable ones flooding the market.

            Cheers

            Mike

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

            This is a community forum for REXYGEN users and fans. Detailed information can be found at REXYGEN homepage.

            There is also an outdated REXYGEN community forum.

            Powered by NodeBB.