Simulator for EEG signals.
AdelAkl
France
Hello!
I'm actually making an internship and I'm trying to build a simulator for EEG signals that should work with OpenBCI GUI. We have Cyton + Daisy boards, I studied the BLE GZLL part with the Dongle, made it work, and I'm now stuck with the WiFi part. As we don't have the WiFi Shield, I have carefully read all the documentation about it. I'm working with an ESP32 and I've found a project on GitHub using it and I based my work on it ( https://github.com/FarukEroglu2048/OpenBCI-ESP32-WiFi ). In my case, I don't need the ADS1999 part as I'm using the ESP32 to generate some random sine signals (for the moment), prepare the 33 bytes packets and send them via WiFi to my PC (the ESP32 is configured as AP and sending TCP packets). So far I'm able to show my signals in the GUI with 8 channels. The problem I have is when I try to switch to 16 channels the GUI doesn't show any signal. I might need some help to know how to fix this.
The data format for the 16 channels in WiFi is still 33 bytes ? (I saw that the boards are supposed to generate 32 bytes and the WiFi shield is supposed to add the 0xA0 byte but I'm not sure if it's still the case for 16 channels). Is the GUI interpreting packets like the ones sent in BLE ? (cyton value on odd sample numbers, daisy values on even sample numbers)
I changed the board name from cyton to daisy in my code, is that enough to force the GUI to understand that the incoming packets are data of 16 channels ? If it's not the case, what should I edit ?
I hope my problem is clear (sorry for my approximative english) and thanks for your time.
Comments
The OpenBCI GUI v5 displays data collected using BrainFlow - Java Binding. I think you should take a closer look at this piece of the software stack. Here are the links you need to continue working and re-evaluate what you have already tried.
OpenBCI Cyton Data Format Guide - https://docs.openbci.com/docs/02Cyton/CytonDataFormat
BrainFlow Main Site - https://www.brainflow.org
BrainFlow Github Repo - https://github.com/brainflow-dev/brainflow/
Software Emulators for most supported boards in BrainFlow - https://github.com/brainflow-dev/brainflow/tree/master/emulator/brainflow_emulator
Take Care,
RW
Hello,
Thanks a lot for the links, after looking at the board controller code for cyton daisy wifi in the GitHub repo, it seems like the format is the same as for cyton but need to join two packages together, so I need to send 66 bytes with the same sample ID. I tried this and it works perfectly.
Thanks again.