djfletch42
djfletch42
About
- Username
- djfletch42
- Location
- USA
- Joined
- Visits
- 591
- Last Active
- Roles
- Member
- Location
- USA
- Interests
- veterinary medicine, epilepsy
Comments
-
Hey there. Glad you got it working. I am collecting 15 channels of EEG (common reference SRB2) and one channel of ECG (bipolar input), so 15 EEG inputs, reference, ground, and two for ECG. All the besr, Dan
-
Hi biomurph. The USB connector is to charge the Li Ion battery (the large green one!) in the case. The 5V header is easy to get to and making a little voltage divider was no big deal. Thanks for being so concerned about my welfare! All the bes…
-
STL files are posted! Here's the link:http://www.thingiverse.com/thing:2085981 Let me know if you have questions. All the best, Dan
-
It's 12.5cm long x 9.5cm wide x 4cm tall. Hopefully it will fit! All the best, Dan
-
Oops. Sorry about that. Here it is: https://www.amazon.com/uxcell-Female-Knurled-Threaded-Embedment/dp/B01IYWTCWW/ All the best, Dan
-
Here are the parts you need to build this. 3400 mAh Li Ion Battery (this is a pack of 2): Amazon link Battery holder: Amazon link Lighted pushbutton switch: Adafruit link (we tapped 5V off the OpenBCI header and used a voltage divided resisto…
-
I believe this is the bug I pointed out in another thread. The conversion algorithm for the hex values is not applied to channels 9-16.
-
Hey Folks. My friend who did most of the designing is happy to share the STL files. He'll upload them to Thingiverse (I wanted him to upload it under his account since he really did the lion's share of the designing). Once he gets it uploaded I'll p…
-
Thanks for the responses. Very helpful. Now I get how the samples come in. Sorry I didn't find that other post. I did search, I promise! It is interesting how the 16 channel bandwidth issue is dealt with. My plan is to use the streaming data to "…
-
Still trying to reach them. No response to a direct email at this point. If I can duck out of work today I'll try to call. Dan
-
Hey Folks Just wanted to update some things regarding the 16 channel board. I'm confused about the sampling rate. Looking at the files collected, although my understanding is that when the 16 channel board is used streaming only occurs at 125H…
-
Sorry, that was just copy and pasted from the original code. I didn't finish editing the comments. Those coefficients are for the 125Hz sampling rate. I did clone the distribution from github, but I figured you guys were likely working on fixing the…
-
In case it's helpful, I did go through and calculate the filter coefficients for the 125Hz sampling rate. This code will incorporate the new filter coefficients into DataProcessing.pde. I used Matlab to calculate the coefficients and verified for ea…
-
Hmm. Let's try again.
-
So, I let the GUI run for awhile just now and it seemed OK at first, then I started getting these messages repeatedly in the Console:OpenBCI_ADS1299: apparent sampleIndex jump from Serial data: 133 to 135. Keeping packet. (64834) OpenBCI_ADS1299:…
-
Sorry, found it. It's in DataProcessing.pde lines 369-376 //check to make sure the sample rate is acceptable and then define the filters if (abs(fs_Hz-250.0f) < 1.0) { defineFilters(0); } else if (abs(fs_Hz-200.0f) < 1.0) { …
-
In hardwaresync.pde I changed line 300 to be:private final float fs_Hz = 125.0f; //sample rate used by OpenBCI board...set by its Arduino code and in datalogging.pde I changed line 411 to private int fs_Hz = 125; I didn't have time last nig…
-
OK, so I did some more investigating. It looks like although the GUI code states that you should use a sampling rate of 125 Hz for 16 channels, it actually sets a constant sampling rate of 250Hz. I changed it to 125 in the Processing code and that s…
-
Sorry, I realized that the message in the Processing console right before the error message might be useful: X :: 1328872 OpenBCI_ADS1299: apparent sampleIndex jump from Serial data: 11 to 13. Keeping packet. (1) Error, disabling serialEvent()…