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• Added some of my own analysis here. Hopefully this isn't duplicative with documentation found elsewhere...but if it isn't I couldn't find it! The firmware itself is undocumented, thus not very helpful. How I think impedance calculation on the Gan…

  in Accuracy of impedance test signal on Ganglion Comment by thellertik June 2020
• Hi William, Thanks for the response. Indeed I've received and tested with the hardware at this point, and it works pretty well. I'm still not sure about the magnitude of the error in the values, but they seem to vary as I expect (impedance is bette…

  in Accuracy of impedance test signal on Ganglion Comment by thellertik June 2020
• Just a tip for anyone arriving here: make sure to try sudo ./OpenBCI_GUI for running from command line if you're having trouble finding the BLED112 dongle in the GUI under linux/ubuntu. Sudo usage is mentioned in the docs, but it would be useful …

  in GUI can't find Ganglion BLE on Linux Comment by thellertik June 2020
• Also I know that head phantoms are a thing that can be used for characterizing impedance: * Mentioned here: https://openbci.com/forum/index.php?p=/discussion/2200/ganglion-test-with-square-wave-input-droops-somewhat * And this paper uses them:…

  in Accuracy of impedance test signal on Ganglion Comment by thellertik June 2020