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Mayfly v1.1 technical questions forum thread

Home Forums Mayfly Data Logger Mayfly v1.1 technical questions forum thread

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    • #16619
      Shannon Hicks
      Moderator

      This is the forum thread to ask general technical question about the Mayfly v1.1 board.  If you’ve got a basic question such as what are the board’s features or how it differs from previous versions, this is the place to ask.  If you’ve got a more complicated question or issue, then it is probably best to start your own thread.  The goal of this thread is to be a great information resource for basic questions about the new v1.1 board that are common to all users.

      For questions about purchasing and availability of EnviroDIY products, ask those on the dedicated Status and Availability forum thread if the aswer isn’t readily apparent from the table on the main EnviroDIY Hardware Status and Availability page.

    • #16615
      mbullard
      Participant

      Hi Shannon,

      Is there a topic describing changes from Mayfly V1.0 to V1.1?  If not, can you describe?

      Thanks,

      Mike

    • #16616
      Shannon Hicks
      Moderator

      The only difference between versions is stated in the first paragraph of the blog post:  the only major change being the circuit that provides the switchable 12 volt boost output was redesigned to provide a higher power output. And 2 minor changes: one set of pin labels were slightly change and one solder jumper was added to the back of the board for an optional battery-measuring feature. (see more at Details and Specs)

    • #16617
      mbullard
      Participant

      Thanks!

    • #16745
      Jim Moore
      Participant

      Hi @shicks  I got my 5 pack of the v1.1 boards today and I noticed that:

      • Removed External/Lipo slide switch since it’s no longer needed

      Does that mean I can no longer power the Mayfly from a 12 V supply?  I have an application for water sampling and the pumps run on 12V and they are controlled by the Mayfly so I can power the whole system with a 12V utility lead acid m/c battery.

    • #16746
      Shannon Hicks
      Moderator

      That is correct, the Mayfly v1.0 and 1.1 boards do not have a separate external power input for 4v to 12v sources like the v0.5b boards.  This is because the main voltage regulator on the v0.5b board that accepted that wide range of voltage was discontinued by the manufacturer, and the new voltage regulator doesn’t accept that high of an input voltage.  However the tradeoff is that the new regulators have double the current output (1 Amp instead of 500 mA).

      To power a Mayfly v1.0 or v1.1 board from a 12v battery, I’d suggest a 12v-to-5v power adapter with a USB-C plug on the end, and just plug it into the Mayfly’s USB port, and preferably one with a low quiescent power draw so that it doesn’t waste too much power on the dropdown.  I think a few people on the forum here have recently mentioned adapters that they’ve had either good or bad results with. Something like this might work, but I haven’t test this exact model so performance results with a Mayfly aren’t guaranteed.   You should also turn off the dip switch (after programming and when you’re ready for deployment) for the USB LED because it’ll save several mA of current for the LED and about 10mA of current for the CP2102 USB adapter chip that is powered anytime the Mayfly v1.0 or  v1.1  is powered by a USB cable.

      The other improvement of the new Mayfly boards when paired with the new sim7080 LTE cell boards is that these cell boards no longer require a direct connection to a 3.7v lipo battery like the Digi LTE boards did with the custom adapter board.  Those older setups were harder to power from a 12v battery because you still needed to provide a separate Lipo battery for powering the LTE board.  Now with the new sim7080 LTE cell boards, everything can be powered from just the 5v USB connector with no external lipo necessary.

      • #16805
        David Lutz
        Participant

        Shannon,

        I ordered several boards in the 1.0 release in the fall as replacements for 0.5 boards that are currently in the field. Our setup for those involved using DIN rails to connect large marine cycle batteries so we could keep our terrestrial stations operational during the winter. So, we used the 12v regulator on the 0.5 board and it has worked really well.

        For the 1.0 boards, I wonder if we could order a bare wire version of the step down module you linked, and then just connect that to a JST connector for where the solar panel input is. Can you think of any issues that may arise with that type of setup?

        Sincerely,

        Dave

        • #16806
          Shannon Hicks
          Moderator

          Powering the Mayfly v1.0 and v1.1 from the solar jack only would not be recommended because the power input circuit was not designed to operate that way.  The most electrically efficient way is to use the 12v-to-5v converter and connect it to the USB-C jack and then deactivate the USB interface circuitry with the dip switch as explained above.  The Mayfly will not operate properly if you only provide power to the solar jack with no 3.7v Lipo connected to the LIPOBATT jack.

        • #16810
          David Lutz
          Participant

          Thank you so much Shannon!

          One very minor last question – for the DIP switch, that would be turning the USB DIP to ‘off’ for the purposes of LED operation, correct? The ‘Power’ DIP switch would remain ‘on’?

          Thank you!

          Dave

        • #16811
          Shannon Hicks
          Moderator

          The dipswitches are mainly there to let people know their board is working during initial testing or desktop deployments.  Anytime a board is deployed in the field as a “sleeping” station, power savings are important during the sleep period.  So I put the dipswitches on the new versions of the Mayfly to allow people to deactivated the LEDs.  The dipswitch for the green LED only cuts power to the green LED and nothing else, but it will save you about 2 mA.  The orange LED is only on if power is being supplied through the USB jack, like when connected to a computer or when powering from the USB jack like what that converter will do.  Whenever the USB jack is powered and the USB dipswitch is on, the LED is on plus the USB converter chip, which draws some not-insignificant power, so turning off the USB dipswitch will save power and prevent the USB converter from being on constantly.  However, you’ll just have to remember to turn that dipswitch on again in the future if you ever decide to reprogram that Mayfly or want to connect to the Serial Monitor to see some output.

          There’s a description of the dipswitches and all the new circuitry on the Mayfly Hardware Details page.

    • #16752
      Jim Moore
      Participant

      Thanks!  I just ordered two.  My four port sampler project uses 12V motors which draw about 0.4A so I guess that would be an option to use the 12V output and LiPo 3.7V batteries.

      I assume this converter uses switching so it should be reasonably efficient.  I’ll le you know how they work.  Good old amazon – I should get them tomorrow!

    • #16753
      Shannon Hicks
      Moderator

      As stated on the Details and Spec page, the Mayfly v1.1 can only source about 100mA from the 12v output, so if your motor draws 400mA, you’ll need to power the motor directly from your 12v source and not from the Mayfly.

    • #16807
      Jim Moore
      Participant

      @shicks.  I tested the converters you recommended and they appear to work as expected:

      dropout voltage is 8 Volts and will support input voltage to 31.5 V (max on my bench PS).

      No load draw is 3.64 mA at 12 V and 2.83 mA at 31.5 V.

      A lower cost option is a three terminal non-isolated converter at $2.76 ea vs $12 for the PlusRoc.

    • #16977
      neilh20
      Participant

      My USB connect to a rev1.1 board appears to be failing.

      It was working, and now its stop connecting to the PC, stops even causing an audible ding.

      If I take the same USB C cable and plug it in to the USB C of a Rev1.0A3 it sometimes works. Usually causes an audible ding, but sometimes doesn’t appear as a com port.

      I’ve rebooted my PC twice, and left the Rev1.1 board powered off overnight to see if it might recover.

      Just wondering any suggestions  for what might be the issue, or way of checking the driver.

      I am seeing the boards work through the FTDI connector.

      • #16984
        Shannon Hicks
        Moderator

        Are you saying you’ve got a bad cable or a bad Mayfly?  Have you tried a different USB-C cable?  The pins in USB-C connectors and cables are extremely small and are easy to fail.  And when the pins in a cable’s connector get bent or damaged, we’ve seen them inflict damage on brand-new boards, so I’d suggest trying a new cable or two.

    • #16985
      neilh20
      Participant

      Suspect Mayfly1.1

      The cable I was using also went bad and I’ve marked it as suspect – its a distinctive pink cable.  I’ve inspected the Mayfly USB c on Mayfly1.1 with an Eye Loupe, and it is hard to inspect but nothing jumps out, seems OK.

      I did have a USB current monitor in the testing before hand, and the current had gone up to 1.2A while charging a 2.2Ahr battery – but difficult to know if it was related. However the Mayfly options are not set to do a high charge, just 0.5A.

      I switched to Linux Ubuntu to get more details, and a sturdy USB-C interface and I get with working White Cable into Mayfly1.0

      dmesg

      [20236.503620] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

      [20236.503624] usb 5-1: Product: EnviroDIY Mayfly USB to UART Controller

      [20236.503627] usb 5-1: Manufacturer: Silicon Labs

      [20236.503630] usb 5-1: SerialNumber: 0001

      [20236.565048] usbcore: registered new interface driver usbserial_generic

      [20236.565911] usbserial: USB Serial support registered for generic

      [20236.586585] usbcore: registered new interface driver cp210x

      [20236.586749] usbserial: USB Serial support registered for cp210x

      [20236.586863] cp210x 5-1:1.0: cp210x converter detected

      [20236.594710] usb 5-1: cp210x converter now attached to ttyUSB0

       

      but then insert into Mayfly1.1 it  doesn’t respond on the USB. It does get powered,

      I think I have all the switches right, but here is a video https://photos.app.goo.gl/2n43i7qjLGmwbiQz7

       

       

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