qwer1304
qwer1304
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nekrodezynfekator, perhaps this message got lost:- What's your EEG montage (electrode locations, reference, ground, re-reference)? - What's the bandwidth of the filter for picking up each frequency? - In the graph, what is the y-axis scale? - Ho…
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wjcroft, could very well be.Note that since luminosity is only positive, the "sine" is either riding on a DC (1/2[sin(wt) + 1]) or is a rectified sine (abs(sin(wt)).
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@wjcroft,nekrodezynfekator wrote "I checked that sin wave generates better SNR. I compared 3 waveforms: sine, square and sawtooth. Differences between sine and square was unsignificant." So unless there's a typo, he seems to say that difference bet…
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nekrodezynfekator,Very Impressive! - What's your EEG montage (electrode locations, reference, ground, re-reference)? - What's the bandwidth of the filter for picking up each frequency? - In the graph, what is the y-axis scale? - How long do you…
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Except that other times I see 1/Ton frequency.Chip observed this too. http://eeghacker.blogspot.co.il/2014/05/visual-entrainment-blinking-screen.html His conclusion was that the brain responds to a changing signal within a certain frequency window,…
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nekrodezynfekator.With SRB @ the forehead I'm beginning to see some meaningful responses. Interestingly, the O1 and O2 responses are stronger than Oz. The responses decrease as I move up along the midline, i.e. POz is weaker and Pz is the weakest …
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I have NEVER succeeded to program the board with the OFFICIAL sequence (maybe 20 attempts), but succeeded to program the board with the MAGIC sequence EVERY time I tried. Since it couldn't hurt, I'd think that the MAGIC sequence should become the of…
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Yes, and it seems the work.You REALLY need to add to the documentation the magic sequence of: 1.Power dongle and board down 2.Power dongle up 3.Press RST on board 4.Power board up 5.Press PROG on board 6.Release RST on board 7.Release PROG on…
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It is vital to do EXACTLY this:Turn on the board after the dongle is plugged in (start the Host radio before the Device radio) Hold the RST button down, turn on the board, then press the PROG button and hold it while releasing the RST button. (th…
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I commented out the include of plib.h and removed plib.h and peripherals subdirectory from installation.The code compiles with the added casts to Sd2Card.cpp and OpenBCI_32_Daisy.cpp. I wonder how it compiled before?
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I downloaded the library from here http://www.microchip.com/SWLibraryWeb/product.aspx?product=PIC32 Peripheral Library and installed plib.h and peripherals subdirectory in C:\Users\david\AppData\Local\Arduino15\packages\chipKIT\tools\pic32-tools\4.…
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Same problem here. I have Sd2Card.cpp as listed above. Help!
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William, thx. How many cross straps layers do you use? I understand that "hatband" is transverse / horizontal, "midline" is sagittal / front-back and "cross strap" is coronal / left-right. As I explained, the problem is with midline electrodes - …
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wjcroft), How are you securing the electrodes along the z (midline) strap (along the sagital plane) at locations where there's no intersecting transversal or coronal straps? I mean, e.g. Pz, Fz, etc? What I found out was that since the sagital stra…
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nekrodezynfekator's. The difference was the colormap we're using.What bothers me are: * The Fp signal is much better pronounced (it should be the other way around, shouldn't it?) * The Fp signal is much more stable (why is the O signal intermitten…
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nekrodezynfekator Could you send me the Matlab code you're using? Thx, D
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Try now. Sorry http://dropcanvas.com/4ut6p
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Here it is: http://dropcanvas.com/4ut6p
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Here's the image of the spectrogram As you can see there's nothings at 11 Hz, 22 Hz, 33 Hz, etc. Ideas? PS Tried with SRB2 @ Cz. No difference.
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Hi,I'm having trouble getting meaningful response to SSVEP. The setup includes a 32bit OpenBCI board, OpenBCI cup electrodes and/or FRI dry electrodes; fresh battery pack. BIAS and SRB2 are on mastoids OR BIAS is on mastoid and SRB2 on same-side e…
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Thx Yannick.I wan't thinking about 2S but rather about adding a booster like William does. I don't like it too much because of the extra complexity and the noise it adds. David PS BTW, what is this graph of? I means - why the cutoff at 800 mAh?
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Hi Yannick,Thx for this. It'd seem that 3.7V is TOO restrictive with LiPo discharging, wires, temperature, etc. Is Vout really 3.3V? I thought it was 3V only. Thx, David
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For the 32b board, can I work directly off the 3.7V LiPo?Thx, David
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Great idea which never made it into the docs Pitty
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William,Yes, I was referring to those @ecube posts. Thx for the explanation. Just to clarify: 1.How is the FRI comb connected to Ditz #10? I don't see a matching female snap on top of the FRI. 2.The Ditz #10 and #4 are soldered back-to-back, cor…
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Hi,Regarding the Dritz snap - could someone please outline exactly how the electrode (presumably from FRI) are connected to them and how the aggregate is connected to Velcro. I didn't understand why BOTH 10 and 4 mm snaps are needed and WHAT par…
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OK, found the jpg files.Sorry.
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Using modified test_log.py script, here're the RAW hex values read from the serial for GND and DC test configurations.GND: a0|07|.0d.f2.1a.08.15.b4.09.9c.3c.09.b0.6a.0c.27.d0.09.0f.aa.06.b4.cd.08.d0.e3|.00.00.00.00.00.00|.c0|VAL DC: a0|0d|.00…
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Something funky is going on with Python i/f. I tried using the test signals to connect the pins internally to known signals. There's an effect, but the values read are meaningless. For example, here's what I got with /test0 (all pins to GND):-------…
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BTW, here's how the data looks like when board is created with scaled_output=False:--------------------------------- ID: 143.000000 638, -1142, -170, -6, -39, -6561, 4069, -4002 0, 0, 0 --------------------------------- This indeed looks like s…