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Soil Temperature Probe

Home › Forums › Environmental Sensors › Soil Temperature Probe

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    • 2015-08-25 at 9:21 AM #1244
      Rick Vogel
      Participant

        Has anyone come across a single probe with soil temperature sensors at various depths within the probe? I know there are numerous soil temp/moisture sensors for depths close to surface, but looking for one that might have 5 to 6 different depths within a single probe.

        Looking to measure depths of 4, 8, 12, 20 and 40″

      • 2015-09-15 at 7:32 AM #1264
        Steve Roberts
        Participant

          I am also looking to do the same thing. So would be interested to know if you find anything.

          I am currently looking at using multiple 1-wire ds18b20 sensors. Ultimately they could be built into a tube, or my plan – tape them to a stick at the relevant depths.

        • 2015-09-15 at 9:35 AM #1265
          Rick Vogel
          Participant

            We actually built 3 “in-house” prototypes that utilized different style thermistors(rivet style, tab w/ screw, etc…) and housed them in a single pvc pipe that was capped. We filled the pvc with spray foam to try and deal with moisture issues. All wires from thermistor were ran to a campbell datalogger at our Sterling, VA test facility and all seemed to work out great. Problem is choosing one and finding economical production of such a device.

            Our plans to move forward with soil temp data gathering with this style of probe will be forthcoming in the next year or so. As I get more info or find a source I’ll update the community.

          • 2015-11-11 at 11:45 AM #1297
            demir celik
            Participant

              Hi, i am a electronic hardware designer and working on sensor based projects now days. I am also looking for a temprature sensor, humidity sensor and the soil sensor.
              What are best sensors and what is their working principle? Can you please help me to understand their working?
              Also what is the most working and the compatible hardware for this type of sensors for their control and observation?

              7pcb.com

            • 2016-11-28 at 8:15 PM #1808
              Steve Roberts
              Participant

                Update for info.
                So I used last year and continue to use 6 ‘nodes’ of 4 ds18b20 one-wire waterproof sensors (potted in a stainless steel tube) on a single bus ~60m of outdoor grade cat5e. Each ‘node’ consisted of a set of 4 sensors taped at to a 50 cm long bamboo cane at intervals. Cane simple inserted into an augered hole in the soil and sensors pressed up against the side of the hole before backfilling. Sensor bus connected to a OWplug from taaralabs.eu and logged by a Sodaq Mbili with a GPRSbee sending the data by ftp to my server as csv files. Was pretty reliable last year, but seem to be having issues with condensation in the junction boxes this year. The sensors all record within about 0.1 to 0.2°C of each other when checked in a waterbath.

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