In search of old hardware schematic for the ads1299 breakout board

lunarbrainlunarbrain India
in Hardware

I was going through the @wjcroft github and I found a project using ads 1299 and rPi. The breakout board looks really compact but the repository doesnt have the schematic. Can some help me find it?
https://github.com/wjcroft/RaspberryPiADS1299/blob/master/images/banner.jpg

Comments

  • wjcroftwjcroft Mount Shasta, CA

    That was an old project of AJ Keller. You could try contacting him directly. However a better route would be the current iteration of the Pi board.

    https://www.google.com/search?q=pieeg

  • lunarbrainlunarbrain India
    edited August 21

    Great! Thank you so much. I was specifically looking for something compact, and your board fits that requirement perfectly. The piEEG isn't as compact in comparison.

    Could you please confirm the following for me?

    1. Is the schematic for piEEG similar to yours, even if not identical?
    2. Can we make the board more compact by using smaller SMD components?
    3. Is this a breakout board that can be connected to any MCU board, such as Arduino, ESP32, SEED XIAO, or Teensy 4.x?
    4. Can I power both the MCU and the ADS1299 breakout board, if it is indeed a breakout board, using the same power supply?
    5. I'm asking these questions because I want to run some experiments before designing my own schematic and PCB.

    P.S I used ChatGPT to improve the above message, as English isn't my first language.

    Thank you @wjcroft

  • wjcroftwjcroft Mount Shasta, CA

    The PiEEG has a Github I believe. AJ Keller's project never produced any products beyond his prototype. Not sure if AJ even had the software to drive the board. PiEEG comes with software.

    For safety reasons, any EEG system should be either battery powered, or comply with IEC 60601 medical standards. Neither of these board comply with 60601. Nor does OpenBCI, but those boards ARE battery powered.

    I would be cautious with the PiEEG design. Some previous noise measurements I've seen, imply that they may not be complying with Texas Instruments "star ground" / multi-plane design standards (shown in the data sheet). And PiEEG recommends you connect the Pi digital Ground pin to the client. (As a noise reduction workaround.)

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