Connect Ultracortex Electrodes to Daisy Module

ericharshbargerericharshbarger
edited November 2016 in Headware
I soldered some header pins to my OpenBCI 32bit Board and Daisy Module. Do I need to connect some of the electrodes from the OpenBCI Ultracortex Mark III "Supernova" to the Daisy Module? I'm not sure which color electrodes go to which pins on the Daisy.

Comments

  • wjcroftwjcroft Mount Shasta, CA
    edited November 2016
    This link should go to the section with the mapping,

    But something appears odd with where it scrolls the page to. Manually scroll to the section "Identify electrode locations".

    Also a color map here,


    William

  • ericharshbargerericharshbarger
    Thanks. I read the links. I'm still not following which color electrodes go to which pin numbers. I want them to correspond to the default mapping in the OpenBCI GUI. Can someone please post a list of it of the mappings for the OpenBCI and Daisy? I tried to to figure it myself by touching the electrodes and seeing what lights up on the OpenBCI_GUI head map. But I wasn't able to figure it out. I think the greys go to N1P. But which grey goes to the Daisy and which grey goes to the OpenBCI?

  • wjcroftwjcroft Mount Shasta, CA
    It's on the link mentioned previously,


    More specifically,


    The silkscreen labeling on the board is slightly confusing. There was not room for the full Texas Instruments ADS1299 pin designations. These are IN*N for the negative pins, and IN*P for the positive pins. The IN*N pins are the default and closest to the board. Those numbers line up with the colored diagram.
  • ericharshbargerericharshbarger
    Thanks. I already read the link. The picture and link don't show which color wires go to which number pins though. Can you please help with this?
  • wjcroftwjcroft Mount Shasta, CA
    Maybe I'm not understanding your question. The picture shows a head map with colored dots, and channel numbers in the dots. The colors repeat because there are only so many colors in the ribbon cables. Grey on the mainboard is channel 1. Grey on the daisy is 9.

  • ericharshbargerericharshbarger
    Ok. So then purple on the Daisy would be Channel 10? Maybe my question wasn't very clear. I wanted to know which channel numbers correspond to which pin numbers?
  • wjcroftwjcroft Mount Shasta, CA
    Yes, the channel number IS the pin number.

    Channel 1 = IN1N
    Channel 2 = IN2N

    etc.


  • ericharshbargerericharshbarger
    Ok. Thanks. I think I was able to it figure it out. The GUI shows activity for most of the electrodes when I'm wearing the Ultracortex only if I do not have the 2 ear clip electrodes on. But whenever I put on the 2 ear clip electrodes on all the other electrodes on the Ultracortex change to Railed on the GUI. Is this supposed to happen?
  • wjcroftwjcroft Mount Shasta, CA
    Are you sure you have your ear clips connected with a Y-cable to BOTH SRB2 reference pins?

  • ericharshbargerericharshbarger
    Yeah. I'm sure everything's connected
  • wjcroftwjcroft Mount Shasta, CA
    What happens if you just try the simplest experiment possible?

    In other words, one channel only, say O1 or O2 or Pz, then SRB2 on one ear, Bias on the other. All of these pins are the ones CLOSEST to the mainboard.

    What was your experience following the tutorial?

  • ericharshbargerericharshbarger
    Maybe I don't have the ear clips connected correctly. I have the yellow wire that goes to the ear clip connected to the bottom SRB pin on the Daisy, the white wire connected to the bottom SRB pin on the OpenBCI, and the black wire connected to the bottom BIAS pin on the OpenBCI. Is this right?
  • wjcroftwjcroft Mount Shasta, CA
    http://openbci.com/forum/index.php?p=/discussion/254/soldering-16-channel-openbci-kit


    [use left column menu to select Reconnect wires to OpenBCI & connect ear clip electrodes (Reference & Ground)]

  • ericharshbargerericharshbarger
    I have ear clips connected properly but still get the problem. I tried using one channel only, Ch1, and connecting it to the OpenBCI and it works normally. I followed the tutorial you linked to and tried with more channels connected only to the OpenBCI and it works normally.
    I also tried using one channel only, Ch9, and connecting it to the Daisy. But the GUI said everything was Railed or Near Railed. Could this mean I soldiered the Daisy incorrectly or I have defective Daisy?
  • wjcroftwjcroft Mount Shasta, CA
    Sounds like your Daisy is not working, it could be your soldering job. Can you post a photo?

    I think I heard that new Daisy's being sent out are pre-soldered. So that sounds like a wise move. Do you have a "solder-sucker" tool, in case you need to redo some of the pins?

    https://www.google.com/search?q=solder+sucker

  • ericharshbargerericharshbarger
    I think I have a solder sucker tool. Actually the Daisy might be working. It might just be that I'm having trouble getting the Ultracortex into the right position on my head so that all channels show activity at the same time
    image
    image
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    image
  • wjcroftwjcroft Mount Shasta, CA
    Photos look reasonable.

    So just to confirm, you have a Y cable between the Daisy and mainboard SRB2 pins, and then this Y connects to one of the ear clips. The other ear clip goes to Bias on the mainboard.

  • ericharshbargerericharshbarger
    Yeah. That's how I have it set up. I have the Ultracortex on snugly. Also It seems like not all of sensors on the Ultracortex are making contact with my scalp when I have it on my head
  • wjcroftwjcroft Mount Shasta, CA
    Have you screwed down the electrode holders on the ones not making contact? It needs to be adjusted to the individual head shape.
  • ericharshbargerericharshbarger
    Yeah. I've tightened the electrodes all the way. Still not all them are touching my scalp. And it's (almost) painful wearing it.
  • wjcroftwjcroft Mount Shasta, CA
    Hmm, is it possible you could have ordered the next smaller sized frame? What size frame do you have? Is your head circumference within the specs for your frame size?

  • ericharshbargerericharshbarger
    I ordered the medium sized frame, which is for 50-55cm. I just measured the circumference of my head, and it's 52cm.
  • wjcroftwjcroft Mount Shasta, CA
    Eric, thanks for checking your dimensions.

    I'm going to mention @Conor and Joel @biomurph here, in case they could comment on your frame not fitting in spite of your selection of the correct size based on circumference. 

    I wonder if the part designers have considered making "extra long" Octabolts as an option in cases like this. It sounds like your head shape may be somewhat out of the range of their frame modeling / averaging. I assume the electrodes not touching are on the sides of the head? Can you mention which (10-20 map) site locations are not making contact?

    I don't know if you went down to the small size, if you'd have the opposite problem with the front and back areas too close.

    Regards, William

  • ericharshbargerericharshbarger
    Thanks. I'm traveling right now, so I don't have access to the Ultracortex. But I think I was having more trouble with having both the front and back electrodes touch my head at the samw time. I had someone else try the Ultracortex and I think they had the same problem. But I'll post more details to confirm when I'm back in a week. Is it possible I accidentally got the wrong size frame sent to me?
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