GUI checkboxes / Brainbay verification

fgallinafgallina
edited August 2016 in OpenBCI_GUI
Hi,

Wondering about a couple things in the GUI:
  • What do the check boxes marked P / N do? Should one of them always be checked? I understand that the top inputs on the board are for "P" but does that mean P needs to be checked?
  • What does clicking the numbered circles on the model of the head on the right do?
Also, a slightly related question on Brainbay. I have things working in the GUI but can't tell if Brainbay is registering actual EEG signals. I successfully connect to the OpenBCI amplifier but don't know how to confirm if I'm getting real signals. Is the calibration program the best way?

Thanks,

Frank

Comments

  • wjcroftwjcroft Mount Shasta, CA
    Frank, hi.

    The checkboxes in the GUI turn on what is called "impedance measurement". Which is how much resistance (in ohms) is between that sensor and the reference sensor. You can see that value in ohms pop up on the trace when checked. Normally these boxes are left unchecked. Because when the impedance checking is turned on it also has the side effect of degrading amplifier input impedance (drops it from 1 GigaOhm to 500 Megohms.)

    On Brainbay you need to setup a simple circuit to input the EEG and output it onto a Oscilloscope. See this comment post,


    William

  • fgallinafgallina
    Thanks for the quick response!
  • wjcroftwjcroft Mount Shasta, CA
    edited December 2014
    Frank, I forgot to answer your other question:

    > What does clicking the numbered circles on the model of the head on the right do?

    It's not the numbered circles that are sensitive, clicking anywhere on the whole head-top view has the same effect. This just toggles the 2D modeling "contour plot" animation on or off.

Sign In or Register to comment.

© Vanilla Keystone Theme 2026