Re: channel question for programming Olimex EEG-SMT

Hi Stefan,

Problem is, the manual that didn't come with my EEG-SMT and I couldn't 
find on the web didn't explain this. Thanks for your explanation on this 
topic and as well for your reasoning about GSR because I'm interested in 
any kind of bio-feedback.

Regards,

Arnold
On 01-Feb-13 14:02, Stefan Jung wrote:
> Arnold & Daniel
> Olimex did a good job with the repackaging of modEEG to SMT, but I am 
> pritty sure they didn't change any software.
> The ADC inputs of the micro that where used for channel 3, 4, 5 & 6 in 
> modEEG are simply left floating on SMT-EEG (check the circuit), so you 
> are obviously reading stray fields that are capacitively coupled or 
> more likely, some sort of internal (to the micro) leakage currents 
> from ESD diodes or whatever.  Those leakages are random depending on 
> temperature, age, production batch and even cosmic radiation.  You 
> will not find common behaviour across SMT-EEG units.
> Just ignore any and all data from channel 3 and further.  If it bugs 
> you, you need to short those floating inputs to GND, or disable in 
> software.
> Regards
> Stefan
>
>
> ------------------------------------------------------------------------------
> Everyone hates slow websites. So do we.
> Make your web apps faster with AppDynamics
> Download AppDynamics Lite for free today:
> http://p.sf.net/sfu/appdyn_d2d_jan
>
>
> _______________________________________________
> Openeeg-list mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/openeeg-list
> Go to the above address to change your
> subscription options, e.g unsubscribe.

------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_jan