OpenBCI_Python output: "$$$daisy removed"
Python SDK Test.log.py
---------LOG START-------------
serial closed
Is it normal?
Thanks,
Sefa
Encoding Data and How to send to list
I checked to documents in OpenBCI and github and didn't find how to send all data in a list real time.
Any suggestion or detailed documentation for that?
Furthermore, I have a encoding problem on character when I want get them on therminal. How can I get over this problem?
not detecting a 100uV DC signal generator
I am using Cyton board and trying to amplify a low DC signal (about 100 microVolts) generated directly from a signal generator.
I have connected the output signal to one of the SNP pin of the OpenBCI board (for example, the n. 2).
Then I have grounded the DC signal generator and the board connecting the ground with the GND pin of the OpenBCI.
I am not seeing any signals on the OpenGUI.
Surely I am getting many thins wrongs...Could you help me in some way?
Thank you to youall in advanced....
G.
Simblee BLE Documentation?
Not getting Trigger data using wifi shield connected to Cyton and daisy combination
Research Methodology & Safety
Ganglion Input-Referred Noise?
I am interested in using Ganglion or Cyton board to record Auditory Brainstem Response to click stimulus. To determine the feasibility, I need to know the Input-Referred Noise measured when the input is shorted together. For the Cyton board, all is in the ADS1299 datasheet on Table 1 to Table 5.
For the Ganglion board, I found 2 measured values on the forum.
The first one give a value of 1uVpp Input-Referred Noise at Fs=256Hz ("10 Minutes Noise Test Ganglion.txt")
https://github.com/OpenBCI/Ganglion-Prototype-Data
The second one give a value of 10uVpp Input-Referred Noise at Fs=256Hz
http://openbci.com/community/ganglion-review-input-noise-and-p300/
In both measurements, unfortunately the level of PGA gain is not specified... and it's obvious that gain will influence Noise value. Does someone know the value of Input-Referred Noise regarding the sampling frequency and PGA gain ?
Thanks,
Bad fixed artifacts
collaborate with me on neurofeedback project to train 'Jhana' concentration-meditation states
- Microstate analysis
- Wavelet Packet Decomposition
- Fractal Dimension of the Signal
- Other Machine Learning methods
- Gamification (Achievements, levels, scores, leaderboards)
- High quality Data visualization (the brain is an aesthetic thing to track)
CSV data files contain only bursts of data, not continous streaming
I
have the Mark IV headset with the Cyton 8-channel board connecting via
the Cyton bluetooth. I use the stand-alone GUI application v3.0.1.
Windows 10 on a fairly high-end PC.
I
am trying to get started with recording data. The GUI is set to 250 Hz.
I see csv data files being created in the
"SavedData" folder. However, when inspect them it seems the data is transmitted only in "bursts". A burst
lasts about 4 milliseconds. During that time period I get 3-5 rows each millisecond (as read from the time stamp), so all in all there are about 12-20 rows. Then there is NO data for about 0.47
seconds, followed by a second similar burst, followed by another 0.47 second gap. This pattern repeats. Why isn't it there a continuous streaming? Shouldn't a sample 250 Hz imply that I get precisely 1 row every 4 millisecond? I am not very savvy with electronics so perhaps I am missing something basic here.
Higher sample rates / sample at 2000hz to SDcard?
I do really wonder though, whether it would not be possible to drastically increase the sample rate, if one chose to only use one or two channels?
And if so, how would one go about telling the ADS1299, to only process data from channel 1 and 2 ?
Possible to start writing to SD card automatically when powering on board?
Ganglion: Detecting other brainwaves other than alpha
Crazy Arduino Trigger Signal
I would like to record some events triggered with an Arduino Leonardo. Below is a Ganglion produced record of the reduced triggering signal. The signal, high for one second and low for two seconds, has been reduced to 5 mV with a simple voltage divider (R1=10kΩ R2=10Ω). Why does this signal look so crazy?
MATLAB OpenBCI documentation - hyperlink broken on channel locations
The link to the channel location files (sfp) does not work. I cannot download the location files, so I cannot finish importing my files into MATLAB.
Thanks,
Don
Which electrode to reference when importing data into EEGLAB
I am not clear on which electrode to reference when importing data into EEGLAB. On the EEGLAB Pre-processing Tools webpage I read:
Systems with active electrodes (e.g. BIOSEMI Active Two), may record
data reference-free. In this case, a reference be must be chosen post hoc during data import. Failing to do so will leave 40 dB of unnecessary noise in the data!
I don't want to lose the signal quality. I believe OpenBCI uses Active Electrodes, but do not know which to choose during an import? Which one is best suited? All of the other electrode signals will reference the one. I don't understand how this does not skew results?
Thanks,
Don
Uploading Electrode Location Information to EEGLAB
Repair for Snapped Electrode Wire
