Custom OpenBCI 16-channel WiFi improvement set Manufacturer

1, OpenBCI, 16 channels, WiFi improved version of a set, including OpenBCI motherboard 1, WiFi + Daisy two-in-one board 1, OpenBCI compatible lithium battery power board 1

2, OpenBCI original 16-channel version contains four boards, power supply board + motherboard + WiFi board + Daisy board, while this version will be WiFi and Daisy board integrated into a board, the overall more concise and reliable, as shown in the following figure.

 

 

 

 

3, OpenBCI motherboard, in addition to not soldering RFD22301 BT module, three-dimensional acceleration sensor, TF card slot have been soldered, has been brushed with the latest version of firmware, and can be continuously upgraded to the latest version of firmware.



4, OpenBCI WiFi + Daisy two-in-one board, has been brushed with the latest version of WiFi firmware, and can be continuously upgraded to the latest version of firmware, the Daisy part of the integration of functions into the WiFi board, and the layout wiring, power supply and other parts of the optimization adjustments.



5. OpenBCI compatible lithium battery power board, with 2000mAH lithium battery on board, with long battery life, supporting USB typeC interface charging, with charging current set to 250mAH.



6. as the USB typeC charging interface is not isolated, please do not perform EEG signal acquisition while charging.



7. supporting the latest version of OpenBCI GUI upper computer.


Test results.

1. Sampling rate + number of channels setting
 

When connecting the 16-channel acquisition board, select WiFi mode, 16 channels, and 1K sampling rate.


2. Sweep through the channels from 1-8 by hand in turn and measure the waveform as follows.

In channels 1 to 8, the waveform swept by hand is observed, and the temporal sequence is the same as the direction swept by hand, with channel 1 being the first to observe the waveform and channel 8 being the last.


3. Sweep through the channels from 8 to 1 by hand in sequence, and measure the waveforms as follows.

(a) In channels 1 to 8, the waveforms swept by hand were observed, and the temporal order was consistent with the direction swept by hand, with channel 8 being the first to observe the waveform and channel 1 being the last.

4. Sweeping by hand from channels 9 to 16 in sequence, the waveforms are measured as follows.

(a) In channels 9 to 16, the waveforms swept by hand were observed, and the temporal sequence was consistent with the direction swept by hand, with the waveforms observed first in channel 9 and last in channel 16.


5. Sweeping through the channels from 16 to 9 by hand in sequence, the waveforms are measured as follows.

(a) In channels 9 to 16, the waveforms swept by hand were observed, and the temporal sequence was consistent with the direction swept by hand, with channel 16 being the first to observe the waveform and channel 9 the last.


6. Using a homemade EEG test signal generator to generate a 10 Hz, 50 uV test signal, the test waveform in channel 1 is shown in the following figure.

7, the same signal, the test results on channels 2 to 16

 

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(Disclaimer: This is not a medical device and should not be used for any official diagnostic or medical purposes)

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