measuring EMG using a ganglion board
Maulidiyah
Indonesia
Hi,
I am new to OpenBCI in general. I tried to measure the EMG signal by connecting three leads, two to channel 1 (upper and bottom) and another in the D_G section (bottom). then the input data that is found to be unstable always changes rapidly so that I cannot be certain of the measured value.
a few more things I want to ask:
1. Are the 4 channels not interrelated?
2. how to measure and isolate so that the input values obtained can be stable? Is there something wrong with the step that I did?
Thanks and Regards, Maulidiyah
Comments
Maulidiyah, hi.
Have you set the Ganglion switches correctly for differential (plus and minus) per channel usage? This is the default. But someone else using the Ganglion before you might have set the switches to common reference configuration.
https://docs.openbci.com/docs/03Ganglion/GanglionSpecs#inverting-input-select-switches
Mentioning Richard @retiutut. I'm not sure that moving the Ganglion switch 'tutorial' to the hardware specs section, was the best choice for beginners. This info used to be in the Getting Started / Tutorial.
Regarding EMG measurement with Ganglion, see this other document,
https://docs.openbci.com/docs/01GettingStarted/02-Biosensing-Setups/EMGSetup
Another choice for EMG is with the Myoware board, which acts to integrate the EMG amplitude.
https://docs.openbci.com/docs/05ThirdParty/01-Myoware/MyoGanglion
Regards,
William
We really should have an EMG tutorial for Ganglion users because of the switch setting.
https://docs.openbci.com/docs/01GettingStarted/02-Biosensing-Setups/EMGSetup#1-connecting-electrodes-to-the-openbci-board