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neilh

  • neilh posted a new activity comment 1 month, 1 week ago

    For a fully built commercial offering this has just been announced. Select only the 4-20mA Input Adapter
    https://www.onsetcomp.com/products/data-loggers/rx2100

  • neilh posted a new activity comment 1 month, 3 weeks ago

    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]

  • neilh posted a new activity comment 1 month, 3 weeks ago

    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]

  • neilh posted a new activity comment 1 month, 3 weeks ago

    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

  • neilh posted a new activity comment 1 month, 3 weeks ago

    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

  • I came across this project discussion “Measuring internal temp of oysters and mussel” which has a lot of good discussion and thought it would be good cross-reference for anybody interested in a infrastructure and equipment discussion

    https://www.thethingsnetwork.org/forum/t/measuring-internal-temp-of-oysters-and-mussel/26492/6

  • neilh posted a new activity comment 7 months, 2 weeks ago

    Cal – Some thoughts, if you are using the Mayfly’s battery measurement its not actually measuring the LiIon battery voltage. How are you connecting the solar cell and what rating is it?
    If the battery is charging, its taking current and the voltage indication is close to that of the battery – depending on how much solar there is. For the voltage…[Read more]

    • Neil – there is no solar panel on this setup. We swap the battery with a new charged one after 3 months use.

  • neilh posted a new activity comment 7 months, 2 weeks ago

    Unfortunately I am seeing some issues with the LiIon battery measurement. I think the issue is that the battery measurement uses a 10M/2.7M resistor with a high impedance Analog input, and if its in an RF noisy location (roving cell phones) it can detect some of that energy. Wires can behave in two ways – on the one hand they conduct current,…[Read more]

    • Neil – I saw the spike on my Mayfly for the 2nd time last week. I think I have a different problem than you – and I think my problem is battery related. The spike goes from 4v to 5v then tapers back down over several hours. I can’t imagine any stray electromagnetic field causing that kind of jump for that kind of time span in the middle of…[Read more]

      • Cal – Some thoughts, if you are using the Mayfly’s battery measurement its not actually measuring the LiIon battery voltage. How are you connecting the solar cell and what rating is it?
        If the battery is charging, its taking current and the voltage indication is close to that of the battery – depending on how much solar there is. For the voltage…[Read more]

        • Neil – there is no solar panel on this setup. We swap the battery with a new charged one after 3 months use.

  • Thanks.
    The cct V0.5b shows an option of connecting the Xbee to the LiIon V_bat – which can get to 4.2V – and a very nice low impedance for the Cellular Tx power requirements.
    So if the Xbee-V1-UT/XB3-C-A2 Cellular @ 4.2V was pulling up, that would over drive the mega1284 pins above their Vcc (3.3V).
    At some point the megas1284 protection…[Read more]

  • Oh good to hear it works.
    What pin are you using on the Mayfly.? I could see the references in the code on modemConnect() but couldn’t find any designation.

    One of the problems is that the ATmega1284 doesn’t have any 5V compatible pins, so it may cause some unpredictable behaviour if it pulls the mega1284 pin up too hard – which depends on the…[Read more]

  • I’ve also had this problem with the Xbee S6 WiFi. However I’ve lowered the polling rate and a few other tweaks of the TinyGSM and its been better https://github.com/neilh10/TinyGSM.
    @cal the Mayfly 0.5b schematic diagram of the U6/XBEE-1XBEE-1_LOCK shows the RESET pin5 – the schematic symbol of circle on the mainbody is typically a way of…[Read more]

  • neilh posted a new activity comment 8 months, 2 weeks ago

    Hello Jesse, great you joined.
    Can you need to provide a bit more information.
    It is **normal** ~ though perhaps undesirable and non-intuitive ~ for a depth measuring instrument to show a slightly negative depth when outof water. Depending on the type of physical sensor they don’t know 0.0 – they have to be calibrated for it, and even that,…[Read more]

    • Hi Neil,
      Thanks for your reply! This sensor is submerged deep in a pool. After I saw that it had a negative reading, I cleaned the outside of the probe, put it back in the water, and took another reading and same thing, negative numbers. Some I’m not sure what to try.

  • Wow. Thankyou Stroud Water team for detailed how-tos. Fantastic stream side setup for Mayfly, as well as good reference material for how to do water quality collection.
    One comment, is that we’ve seen sensor cables being gnawed. So we’ve tended to put the cables communicating to the sensors in a flexible PVC sheath. In the West we also get…[Read more]

  • Nice write up on github thankyou. I’ve got the ParticleIO WiFi going for one project. Particularly interesting your TDS references thanks.

  • hi @frbiggs I’ve used the teensy – but it comes in a number of flavors.
    Checkout https://github.com/duff2013/SDI12_T3
    IHMO the Teensy3.5 also has +5V tolerant pins.
    The Teensy3.5 and 3.6 processors have some nice ram. https://blog.adafruit.com/2016/10/06/new-products-teensy-3-5-teensy-3-6/

    Can you say what your context is – are you looking to…[Read more]

  • neilh posted a new activity comment 9 months, 4 weeks ago

    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]

  • neilh posted a new activity comment 10 months ago

    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]

  • neilh posted a new activity comment 10 months, 1 week ago

    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]

  • Thanks for all the help in diving into the ModularSensors code.
    I’ve captured my notes on how to work as a developer with the layers of ModularSensors/TinGSM/KellerLib/Arduino code – https://github.com/neilh10/ModularSensors/wiki/git-cmds-for-preparing-for-a-PR This is really my cheat sheet – but available if anybody else wants it.

  • neilh replied to the topic AREF in the forum Mayfly Data Logger 10 months, 1 week ago

    I’ve put a discussion of measuring LiIon voltage https://github.com/EnviroDIY/ModularSensors/issues/196
    I’m seeing a divergence in between two different sources of measuring LiIon from V_Batt and ExtVolt/ADS1115.

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