dluxemburg/node-neurosky

Only receiving 1 sample per second

Opened this issue · 3 comments

Deleted user commented

For some reason I am only receiving one sample per second instead of the 512 samples per second the device supports.

joelongstreet commented

@clamport - check out page 9 of this document. Notice the note: With the exception of rawEeg, the headset components are transmitted at a rate of 1Hz. rawEeg, if enabled, is transmitted at a rate no higher than 512Hz..

If you take a look at @dluxemburg 's library, you'll notice a config object, looks something like:

this.config = {
  enableRawOutput: false,
  format: "Json"
};

You can set rawOutput to true and the module will pass back the raw data. This "works", but I really don't know what any of those numbers mean. Let me know if they look good to you, I'm starting to thing this mindwave thing is really just a random number generator.

jussiry commented

Unfortunately, even with raw output enabled, it only outputs only 30 samples per second. With direct bluetooth connection (e.g. https://github.com/robintibor/python-mindwave-mobile), i'v been able to get 512Hz, so it would seem to that this is problem with ThinkGear Connector. Please let me know, if someone has been able to get 512Hz through Node.js!

radoslawjakubowski commented

I got 512Hz raw eeg data just by setting the flag:
enableRawOutput: false