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  • @neilh20,
    I’m interested in your mention of working on a ” Water Depth probe using gas sensor”. I’ve been testing a water depth probe made with a atmospheric pressure sensor (BME280) in mineral oil and encapsulated in a section of PVC with a flexible diaphragm at one end. It seems to be working but I need to calibrate etc. I haven’t seen this…[Read more]

    • Hi John – feel free to email me direct on neilh at biomonitors.com as I get it quicker.
      comments: generally pressure sensors are pretty easy to understand and calibrate for a water column – but the devils in the detail. What range (eg 0-10′) and accuracy do you want.
      1) for the BME280 it hasn’t got an easy mechanical port to isolate the pressure…[Read more]

      • I’ve got the calibration OK and I’m using another BME280 for atmospheric compensation. Both BME280s use I2C.
        What I’m unsure of is submersing the BME280 in mineral oil. It seems to work but I haven’t heard of anyone putting the BME280 in mineral oil, or any pressure sensor in mineral oil for that matter, to isolate it from the water. Any…[Read more]

        • BME280 – I don’t know. Its a materials/chemistry issue – how does mineral oil react with the materials in the sensor. Probably easy to test – but how to do longer term reliability testing.
          Years ago, a Motorola/Freescale product “Pressure sensor” engineer suggested I use a high molecular silica gel for interfacing to its air sensor diaphgram.…[Read more]

          • neilh, Thanks for your thoughts on this.
            I’m looking at small rivers and streams. So depth change is generally less than 10 feet, in most cases max change of 1-5 feet. I’d like to get less than 0.1% accuracy and +_ 0.1 inch but I could live with as much as +_ 0.5 inch if I had to.
            I’ve been running the BME280 in the mineral oil for about 8 weeks…[Read more]

            • that sounds pretty fantastic. Of course doesn’t indicate long term reliability and the issues are mechanically how to connect the water pressure with the mineral oil. I’d be interested in how you are thinking about doing it in a steam with the logger connection is say 20′ above the point of measurement. But its giving me someother ideas. I’m…[Read more]

  • My 2-cents on which branch to use is that the *model* structure is that end users work from the master branch. @neilh20 might be overqualified as an end user, so if future readers show up on this thread for help, they may be mislead by the notion that develop is the better branch.

    But the Modular branches have been so very active in development…[Read more]

  • Thanks @neilh20. Thanks for your response. I just installed one of our 10 sensor stations and will update when we have another one installed.

  • Arnoud posted an update 4 years, 9 months ago

    @neilh20 Dear Neil, I read you have experience with Particle. I have bought a Particle Electron for remote monitoring via mobile phone network. I also have a Mayfly to locally record the data. Is there a way I can ´combine´ Particle Electron and Mayfly? For me, the advantage of Particle is that is already comes with a chip that operates in Latin A…[Read more]

  • Heather Brooks posted a new activity comment 6 years, 4 months ago

    Welcome and thanks for posting on the forum, Brandon. Maybe @shicks or @neilh20 can take a stab at this?

  • Heather Brooks posted a new activity comment 6 years, 8 months ago

    @neilh20, thanks for jumping in and making the first guest blog post on EnviroDIY! Looking forward to reading more about your projects.