Accessories for Cyton / smaller battery / case

brownjonkentbrownjonkent United States
edited June 2019 in Cyton
Can anyone recommend:

Battery pack?  I'm using 4 AA carrier that came with the board but would like something smaller/lighter

Case?  Ideally, I want this strapped to a waistband or something of a fighter/athlete I'm working with.  Doesn't need to be fight ready, just something that can collect data as he jump ropes or works with a body bag.

For a cyton board?  no Daisy.. .just a Cyton board that I'm using to collect ECG data... not doing EEG/head word

Thanks!

-Rishi

Comments

  • wjcroftwjcroft Mount Shasta, CA
    https://learn.adafruit.com/li-ion-and-lipoly-batteries/overview

    There are a couple case designs, for 3D printers, etc. here on the forum, try using the search button in lower right column.
  • brownjonkentbrownjonkent United States
    Thanks!

    I saw these, but got lost in all the options.  

    Do I just need a 6V source?  if I find any 6V battery will that power my cyton?

    do you recommend any specific one?

    -Rishi
  • wjcroftwjcroft Mount Shasta, CA
    No, lithium cells are nominally 3.7 volts. The Cyton internally uses regulated 3.3 volt DC power. The regulators on the board reduce 6V or 3.7V to the required 3.3V. You only need a single 3.7V cell. And since lithium is MANY milliamp-hours (mAh) greater than alkaline, you can use a smaller lighter single cell.
  • brownjonkentbrownjonkent United States
    Makes sense!

    A few more noob questions:

    When chosing a 100mAh vs. 500 mAh pack, how do I know what is needed?  I need to basically present a 30 minute demo, but I would ideally like at least a few hours out of a pack.  How can I gauge capacity/duration?

    http://data.energizer.com/pdfs/e91.pdf tells me that I have about 2000-3000 mAh in each of my AA alkaline, but no idea how much the cyton uses.

    Looks like many of the 3.7v packs on the adafruit site suit my needs:

    just need to decide capacity.

    -Rishi
  • wjcroftwjcroft Mount Shasta, CA
    edited June 2019
    http://openbci.com/forum/index.php?p=/discussion/1276/current-consumption-of-cyton-sd-card

    Just divide the mAh of your battery by the 50 ma current consumption of the Cyton. So 100 mAh battery would last somewhat less than two hours. Too small. 500 would be a more common size.
  • brownjonkentbrownjonkent United States
    ROGER THAT!

    thanks! :)
  • wjcroftwjcroft Mount Shasta, CA
    Sorry for typo there on previous post, 100 mAh / 50 mA = somewhat less than two hours. Still rather undersized considering you want a margin of error, and to minimize how often you need to recharge. With the 2500 mAh of your alkaline setup, that gives 2500 / 50 = ~ 50 hours (!) But WAY heavy and bulky.
  • brownjonkentbrownjonkent United States
    agreed, I'm picking up the 1000 and the 500mah... use one, charge the other :)

    thanks again!
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