Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, an initiative of Stroud Water Research Center designed to help people advance knowledge and stewardship of fresh water.
New to EnviroDIY? Start here

Recommended microSD card

Home › Forums › Mayfly Data Logger › Recommended microSD card

Viewing 3 reply threads
  • Author
    Posts
    • 2026-04-10 at 2:30 PM #19651
      nick
      Participant

        Hi,

        Is there a new recommended micro sd card? It is getting harder to find regular SanDisk 8 or 16gb cards. From what I read on the forum, higher capacity cards might draw more power. These cards are from third party sellers that I don’t really trust: Amazon.com: Sandisk SDSDQM-016G-B35 16GB MicroSDHC Memory Card, Class 4 (RETAIL PACKAGE) : Electronics.

        I have seen SanDisk Ultra 16gb cards, but only a couple of legit stores are carrying them.

      • 2026-04-13 at 1:33 PM #19653
        Shannon Hicks
        Moderator

          Genuine Sandisk and Kingston cards have served us well, not drawing excessive power when the board is sleeping, and being reliable over many years in field deployments.  What we’ve seen issues with is generic cards from random manufacturers because they either fail and corrupt the data after a short time, or they draw 5 or 10 times more power than other cards.  I think any high-quality brand that’s 32GB or smaller should work fine, but you might want to keep an eye on your battery voltage for the first few days after you switch to a new card to see if your battery voltage levels perform the same.

        • 2026-04-13 at 2:03 PM #19654
          nick
          Participant

            Have you had success with the Sandisk ultras? https://www.bhphotovideo.com/c/product/1593899-REG/sandisk_sdsqua4_032g_an6ia_imaging_ultra_32gb.html

            Looks like they are the next step from the basic Sandisk. thanks

          • 2026-04-13 at 7:26 PM #19655
            Shannon Hicks
            Moderator

              I personally haven’t used any Sandisk Ultras with our loggers, so I can’t say how it performs.  This guy did a really great test last year with a variety of microSD cards and summarized his findings (particularly on idle current) in a really helpful list:  https://neurotechhub.wustl.edu/micro-sd-card-low-power-showdown-part-ii/

               

          • Author
            Posts
          Viewing 3 reply threads
          • You must be logged in to reply to this topic.