Shyamal
Shyamal
About
- Username
- Shyamal
- Location
- Canada
- Joined
- Visits
- 97
- Last Active
- Roles
- Member
- Location
- Canada
Comments
-
I tried using a photodiode with a long-distance setting, and it actually worked, but it does increase delays in markers. However, I believe there were constant delays due to the distance between the photodiode and the board. According to you, which …
-
The participant will step forward and backwards and they are standing approx 2 or 3 meters away from the screen and computer. We will have to connect a long wire that connects to computer parallel port to optoisolator to board. Do you think this wou…
-
It is the electrode wire motion that creates the most artifact. In fact having the board co-mounted on the subject can reduce this. And using shorter wires also helps. We recently bought a tool https://www.amazon.ca/Accessories-Release-Co…
-
Hi William, We intend for participants to move slightly during the experiment. However, we've observed that this movement contributes to increased noise in the data. To address this, we're minimizing movement of electrode wires and a modified boa…
-
Hi Max, Thanks for the firmware. I will update it on one of our device for testing. I was wondering if your firmware writes external trigger values as well? and personally how do you convert the sd card file after your recordings?
-
Thanks Max. Our devices had empty files more often, happening approximately 40% of the time. At the moment, we've opted out of using SD cards because data loss isn't something we're willing to risk. However, we're actively experimenting and explorin…
-
Yes, I noticed it on both devices. Yes, we use recommended cards (SanDisk 16 GB/8GB). No, we haven't contacted customer service yet. Previously, we used a USB extension cord for tapping the dongle on participants' shoulders to make this issue le…
-
Understood! Thank you. I'm going to give it a try!
-
https://openbci.com/community/measuring-stimulus-timing-with-a-photoresistor/ I think I want to do something like this, however, it will only give me the of the sensor values and simply not make a marker in the data stream itself. Later, I have t…
-
Thank you for answering the questions. I have two more questions regarding Gelfree BCI Electrode Cap. (1) Can I use ear clips from an Ultracortex headset, which has dry electrodes, as reference and ground electrodes with a Gelfree BCI Electrode Ca…
-
Hi William, I think we bought it a year ago. We are using the recommended SD card on https://docs.openbci.com/Cyton/CytonSDCard/. We haven't tried changing the SD card because it just happened once after using USB extension cable. No, we haven't…
-
I will definitely try the extension cord and situating the dongle closer to the Cyton. Perhaps I will try draping the dongle over the shoulder of the subject. Thanks William, I will update once I try all the things that you mentioned.
-
I think we purchased it about 8 months or 1 year ago. Yes, it does work correctly outside the booth when my laptop is not connected to an external keyboard and HDMI port. No, I haven't tried with only Cyton. Yes it only happened when I was in the…
-
Thanks William it did work! I have a new problem though I'm creating a new discussion for that.
-
So we should expect the impedance to be in range of 200k to 900k. However, our impedance values for some electrodes located near dense hair are high(2000k to 5000k range) and I think we are having trouble with the adjustment of electrodes. when we g…
-
That would be great! Again Thanks Richard @retiutut.
-
I'm using it to convert it to .csv file and then using mne python to again convert it into .eeg file. The .csv file will enable me to convert the data into numpy arrays for machine learning applications and .eeg file is just for standardizing the da…
-
Thanks Richard @retiutut for the update, however, just wanted to confirm that is it safe for us to use OpenBCI GUI v4.2.0 for now for hex conversion until the new GUI release?
-
Understood, Thank you @wjcroft. Waiting for Richard's @retiutut comment on hex conversion using GUI v4.2.0.
-
Ignore the data of EEG channels in the images.
-
Understood, now to convert the hex values in those files we need to set the scale factor to be about 0.02235 according to this thread https://github.com/OpenBCI/OpenBCI_GUI/issues/1014 Also, according to this https://github.com/OpenBCI/OpenBCI_GUI/b…