Getting channel sample data through Hub

verpar · July 2018

This might seem like a very simple (and dumb) question, but what set of instructions are needed to get the channel sample data through the Hub? I see from the OpenBCI Software page on the website that we would send

"t,CODE,SAMPLE_NUM,CHAN_1,CHAN_2,CHAN_3,CHAN_4,(CHAN_N),(PACKET_TYPE),(ACCEL_DATA/AUX_DATA)"

to the Hub to then receive a message back with that info. But how exactly do we format this message and what other messages do we need to send to the Hub before this?

wjcroft · July 2018

Are you referring to this document?

http://docs.openbci.com/OpenBCI Software/07-OpenBCI_Hub

You may be confusing the command sent by the client to Hub, with the response lines (a continuous stream of them) that the Hub sends back to the client. The "t" response strings sent from the Hub, contain the per sample data. To start the stream, see this section,

http://docs.openbci.com/OpenBCI Software/07-OpenBCI_Hub#openbci-electron-hub-command-set-protocol

[Command set, Protocol]

The sample response strings are documented here,

http://docs.openbci.com/OpenBCI Software/07-OpenBCI_Hub#openbci-electron-hub-response-set-samples

Also read the Overview section,

http://docs.openbci.com/OpenBCI Software/07-OpenBCI_Hub#openbci-electron-hub-hub-command-protocol-overview

Regards,

William

verpar · July 2018

@wjcroft Thank you very much, I understand how to work with the Hub after seeing your response and reading over the documents better. I do have one other question. Once you set the protocol, does the Hub stream data automatically, or is there somehting else that needs to be done, perhaps through the GUI or otherwise?

wjcroft · July 2018

The "s,start,;\n" command starts the stream.

http://docs.openbci.com/OpenBCI Software/07-OpenBCI_Hub#openbci-electron-hub-command-set-scan

Getting channel sample data through Hub

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