concerning " improving the sample rate ", V3 or V1 does not make any difference:
If you write the data on the SD using the "block mode" one need to write this block betwwen two samples.
If your sample rate is 8kHz you have only 125 micro second to do it. It is too short...
Even if you keep only one channel you still need to write the 512 bytes of the data block in less than 125µS.
The only difference is that you will write blocks, less frequently .
I am curious;
Do you record "scalp EEG" or something else?
(over 2kHz and may be less, the signal from a scalp is so small that it is completly flooded in the noise)
If you study a signal still meaningfull (A good Signal/Noise ratio) at 8kHz , amplify it a bit and then use the audio input of your PC (choose an optically isolated model or use a portable computer powered by batteries (and unconnected on the main!!!) ).
Thank you for your write back to me. I want to do some special researching, so I want to get more signal detail, I know the signal is too small, but I still want to try it.Now I know why you don't release the V3 SD only firmware, thank you again!!
The only EEG that could benefit from such high rates would be "cortical EEG", from electrodes implanted through the skull. Since you are not doing that, I would listen carefully to @yj 's experience in this area. Rates over 2000 Hz just WILL NOT contain "more signal detail". This is a fact of physics and signal processing.
Thank you, you let me know more about brain wave, but I still hold my research because I happen to meet some special brain phenomenon, they are different with ordinary brain wave, so I want to research the phenomenon by more brain wave detail. Maybe I can discovery some new thing.Let me try it.
I have a question, I found that I can't use wifi API to change the sample rate when I use WIFI shield , I accord the WIFI shield guide to post the command to the WIFI shield , but the respond is : "route no found." why? The other API can work. as: http://192.168.4.1/stream/start
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