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Sensor Developers

  • Diatrix posted an update in the group Group logo of Sensor DevelopersSensor Developers 2 months, 1 week ago

    Hello everyone.
    I’m slowly developing a water quality sensor to monitor water pollution in underground krastic river systems. The main pollutant in these waters is fecal matter from lack of proper water treatment, and sewer systems. This pollution drains on the ocean, where it damages local reefs and it also pollutes local cenotes. Both of these…[Read more]

    • Hello Diego,
      That is an interesting project. Is it in Yucatan Peninsula?
      I think that the advice that you have been given is correct. I don’t know of any sensor that can measure fecal matters real time. The usual way is to monitor the water at fixed intervals, and take the samples to the lab where they can tell you if the bacteria is present.…[Read more]

      • That’s what I was thinking. I’ve been researching fluorescence spectroscopy to make a meter, but I feel like the optical filters would not be cost effective. Although I’ve seen some other comercial products that use them. (See: https://youtu.be/0uipKkfs1rs). The idea is to have a large array of sensors, to find the sources of the pollution.

        Yes,…[Read more]

    • No such sensor yet exists. The best you can do is correlate turbidity from a sensor with measurements from water samples.

  • Mark posted an update in the group Group logo of Sensor DevelopersSensor Developers 2 months, 2 weeks ago

    Does anyone have any experience with these 24v 4-20ma depth sensors from China?
    https://www.amazon.com/4-20mA-Submersible-Transmitter-Pressure-Transducer/dp/B07F5BF248
    I have a few and they seem well constructed. We are working on integrating them with the Mayfly.
    This requires A) a 24 volt voltage source. (We are trying…[Read more]

    • Hi Mark
      Thanks for sharing – just wondering what your power supply source is. Are you solar powered, running of the LiIon battery or another source.
      Technically the spec says “Power Supply:12~36VDC” – that is nominally 24V, but actually a range. That would fit with the…[Read more]

      • Thanks for the great information. I will look into these items and get back.

      • We are planning to be solar powered using a 2500 mAh 3.7V battery and Voltaic Systems 2W/6V solar panel

        • It sounds like the RS485 Wing Shield would work for you, probably standard voltage option but you should check it works. It does require assembly and soldering.
          I was wondering if you have the sensor manual including data protocol and what RS485 registers,

          • No manual. Just a data sheet I can’t read

            • Hello Mark – oops I’m thinking in another dual world – my brain fart.
              The sensor is 4-20mA (i’m using that type of sensor in non-mayfly Onset U30 loggers and trying to move to Mayfly/RS485).
              The 4-20mA with excitation 12-36V is much simpler, but it is not supported directly by Mayfly.
              The excitation voltage can be done with the switched…[Read more]

            • We are expecting to do a little soldering and working on the Mayfly sketch. The data will be sent via Wifi to our own server and to EnvironDIY

    • So to restart the thread – it can be done with RS485 wing board to generate a switched excitation voltage (from the LiIon). The voltage probably needs to be 14V+ so could be U3V50F24 to generate 24V.
      To measure the 4-20mA accurately use Adafruit INA219 with a 10ohm resistor.
      https://www.adafruit.com/product/904
      The Mayfly has the INA219 drivers,…[Read more]

  • Mark posted an update in the group Group logo of Sensor DevelopersSensor Developers 4 months ago

    Hi I am planning to set up some monitoring stations to monitor the Conductivity, temperature and water level in different areas around our county. Does anyone have a recommendation for a lower cost conductivity and temperature sensor?

  • Rick Vogel posted an update in the group Group logo of Sensor DevelopersSensor Developers 3 years, 7 months ago

    I had a recent question from a person stationed in Alaska regarding ice thickness measurement. They already perform the drill and measure method, but was wondering is there was any hand held instruments or other smaller device that can measure without the need for drilling through the ice. Please let me know if anyone has heard of such a thing. Thanks!!

  • Rick Vogel posted an update in the group Group logo of Sensor DevelopersSensor Developers 4 years ago

    Anybody aware of a source for probe style enclosure that could have filter cap screwed on top. I would like to put my sensor board in a probe housing but can’t seem to find that type of enclosure around anywhere.