Default Avatar

Mike

Mike

About

Username
Mike
Joined
Visits
164
Last Active
Roles
Member

Comments

  • Sounds great. When should we expect V4? Any rough estimation for that?
    in SPI / WiFi transfer EEG data to external device Comment by Mike September 2015
  • Thanks William. I'm not sure why a single LiPO at nominal 3.7V 500mAh shouldn't be sufficient for running the 32bit board. Did you try to run it? How long did it last? Your comment about the revised board sounds interesting. Any idea when are …
    in ADS1299 sample rate / threading Comment by Mike August 2015
  • Yeah, I read what he wrote. That's why I asked, he probably has it already
    in SPI / WiFi transfer EEG data to external device Comment by Mike August 2015
  • Has anyone tried to evaluate Spark's Photon with ADS1299? Mike
    in SPI / WiFi transfer EEG data to external device Comment by Mike August 2015
  • Any of you tried to run OpenBCI 32bit version directly through a LiPO battery? Any issues with that? Thanks,  Mike
    in ADS1299 sample rate / threading Comment by Mike August 2015
  • Hi, Yes, as William said, I'm using Adafruit Powerboost 500C.  Would love to hear any update on this issue. Thanks,  Mike
    in ADS1299 sample rate / threading Comment by Mike August 2015
  • Well, I'm still having issues with the OpenBCI device. Not very often the device suddenly start to transmit packets with sample counter = 0.Is this known issue? Has anyone reported on it?
    in ADS1299 sample rate / threading Comment by Mike August 2015
  • One more thing -  how would you differentiate between a packet that holds accelerometer data and one that doesn't? By default accelerometer data should be received at 25Hz(which also keeps changing... ) but if the data rate of the EEG changes repeat…
    in ADS1299 sample rate / threading Comment by Mike August 2015
  • Hello William, I have read the post that you linked. I couldn't see any solution there. So, I was wondering if someone has figured out some way to overcome this issue. It is making much harder to do an accurate signal processing this way. About…
    in ADS1299 sample rate / threading Comment by Mike July 2015
  • Hi,  I'm experiencing some really strange behavior with OpenBCI sample rate.  Does it make sense that the sample rate is over 250Hz ? I'm using the default firmware that comes with OpenBCI 8bit board. Any feedback will be appreciated. Tha…
    in ADS1299 sample rate / threading Comment by Mike July 2015
  • One more thing I have just noticed that after half an hour or so I'm starting to get many missing packets - the counter is getting out of order..  I had a suspicion that maybe it has to do with battery power - so I measured the battery but it seem…
    in ADS1299 sample rate / threading Comment by Mike July 2015
  • Hi Chip. Thanks for the detailed response. I actually tested this fix. I might have misunderstood, but the thing is that once I change the gain, you can see how the signal is zoomed and looks much bigger, which as far as I understand should not happ…
    in OpenBCI_GUI: ADS1299_gain (scale factor) always x24? Comment by Mike July 2015
  • Hi Chip,  Just wonder, wouldn't there be an issue with "VertScale" if gain is changed per channel yet the scaling for the display data is performed for all channels? Mike
    in OpenBCI_GUI: ADS1299_gain (scale factor) always x24? Comment by Mike July 2015
  • Could that be the reason for the problem that I'm having?
    in Accelerometer returns 0's Comment by Mike May 2015
  • Btw, what the sampling rate that you used? It looks like it is higher than 25 Hz?
    in Accelerometer returns 0's Comment by Mike May 2015
  • Is it with 8 bit or 32bit board? I will give another run and see what are the results. This is so strange!
    in Accelerometer returns 0's Comment by Mike May 2015
  • Hello, I'm using 8bit OpenBCI and I'm trying to make sense of the accelerometer data that I receive. I have been struggling with it for several days now in vain.  I'd like to know if one of you could please confirm that OpenBCI's accelerometer wor…
    in Accelerometer returns 0's Comment by Mike May 2015
  • I'm using 8bit board. I just downloaded to the board a fresh firmware and made sure that  "OBCI.useAccel" is set to true. I get the same results. Very strange, the accelerometer is not sensitive at all to movements. I noticed that chip checked it aw…
    in Accelerometer returns 0's Comment by Mike May 2015
  • Hi,  1. The OpenBCI device is still with its original firmware, I didn't update the code, so I suppose this flag is set to true ? 2. LIS3DH Registers: 0x07 0 0x08 0 0x09 0 0x0A 0 0x0B 0 0x0C 0 0x0D 0 0x0E 0 0x0F 33 0x1F 0 0x20 8 0x…
    in Accelerometer returns 0's Comment by Mike May 2015
  • Hello Chip.  I was wondering is there a need to set some flag in the firmware or send a command for enabling the accelerometer functionality?  As far as I could tell from the firmware code, the accelerometer is suppose to be on by default. Howeve…
    in Accelerometer returns 0's Comment by Mike May 2015
  • Different EEG devices might require different pre-processing procedures for  the raw data and these procedures are greatly depend on the electronics that are used. So, that's why I believe that it is crucial to properly have some decent document/re…
    in OpenBCI_GUI: ADS1299_gain (scale factor) always x24? Comment by Mike May 2015
  • Well, when system's core data is being processed (e.g. scaled, filter etc) wrongly I suspect this is considered a serious bug. As far as I understand, OpenBCI's UI is part of OpenBCI EEG solution and most people use it for analyzing and evaluating  …
    in OpenBCI_GUI: ADS1299_gain (scale factor) always x24? Comment by Mike May 2015
  • Hi, Can someone please answer my 2nd question. I suspect there is some serious bug there. Also, in the document below you claim that this value should be adjusted when amplification is changed.  http://docs.openbci.com/software/02-OpenBCI_Stream…
    in OpenBCI_GUI: ADS1299_gain (scale factor) always x24? Comment by Mike May 2015
  • Hi,  This document says that the scale factor is a function of the user's selected gain, however, in the code the "ADS1299_gain" doesn't change even if the ADS1299 gain was modified.  Would like to hear if there is some explanation for this behavi…
    in OpenBCI_GUI: ADS1299_gain (scale factor) always x24? Comment by Mike May 2015
  • Very informative. Thank you.      
    in which input pins when using multiple EEG channels? Comment by Mike April 2015
  • Thanks William.  I had a look on the OpenBCI code and it doesn't work as I expected - it doesn't have to use live lead off detection as far as I could tell.    //compute the electrode impedance. Do it in a very simple way [rms to amplitude, t…
    in measuring electrode impedance Comment by Mike April 2015
  • Hi William  Well, as far as I could tell the impedance values during playback were pretty much the same as the impedance values that were computed during live session. That's why I'm surprised.Am I missing something here?
    in measuring electrode impedance Comment by Mike April 2015
  • Hi, uVRMS is displayed for each channel during offline data playback, if I understand correctly this value relates to electrode impedance? (I usually used to see this values in kOhms).  I'm a bit confused though of how is it possible to comput…
    in measuring electrode impedance Comment by Mike April 2015
  • Thanks William. 
    in Run OpenBCI on LiPo battery Comment by Mike April 2015
  • Hi  Just to double check again before I connect this booster (http://www.adafruit.com/product/1944) to 8bit BCI board. It seems that the board is accepting 6V-12V and the booster seems to provide 5.2V - So, my question is will it work correctly? …
    in Run OpenBCI on LiPo battery Comment by Mike April 2015

© Vanilla Keystone Theme 2026