Regarding the modification of sampling frequency
Hi everyone, according to the documentation and the steps of the upper computer, it was found that the sampling rate for channel 8 is 250Hz, and for channel 16 it is 125Hz. I would like to know if it is possible to use a higher sampling rate? I searched for relevant information but couldn't find any. I used "Cyton+daisy". Thank you
Comments
Tony, hi.
Higher sampling rates are not currently possible. But the next generation products will allow faster rates. Timeline for that unclear.
William
Thank you very much. You have given me a lot of help, but I really can't get any help from you success。I know that data is transmitted from the CP2102 serial port to the computer, but currently the serial port only supports transmission at a sampling rate of up to 250Hz. So I have some ideas, I'm not sure if they're feasible. I replaced cp2102 and used a network port to transmit data. But the result is not very satisfactory. I haven't received any useful information. Can you give me some help?
Tony,
I'm sorry, but any modifications you perform on the Cyton board will VOID your warranty. So I would strongly advise against trying to achieve higher sample rates with the existing hardware / software / firmware.
On the Cyton mainboard, the PIC32 / chipKIT microcontroller sends the serial data to the RFduino radio chip for transmission over 'Bluetooth'. The Bluetooth implementation is NOT using standard BLE 4.x Bluetooth. Instead it is using a custom RFduino firmware from RFDigital ('Gazelle' protocol). This radio channel is already operating at maximum bandwidth of 250 radio packets per second. It cannot go any faster due to radio bandwidth limitations.
Future versions of the Cyton concept will use Wifi instead of Bluetooth which does not have this bandwidth limitation.
Regards,
William
hi,Dr.William。I find a 2017 posts in BBS, https://openbci.com/forum/index.php?p=/discussion/712/prospects-for-higher-sample-rates/p1, told some usage. But I found that when the Arduino burned openbci, it would give some errors.
Am I missing something?
Thanks a lot !
The thread you found is based on an older obsolete Cyton firmware. Hence it is not compatible with current firmware.