Re: channel question for programming Olimex EEG-SMT
Stefan Jung <[email protected]>
| Newsgroups | gmane.comp.science.openeeg.general |
|---|---|
| Message-ID | <CAC3TAzOy4Yk2E10KHDXM-E9x=XYmQWbZfxeS2p030_STzdfZDQ@mail.gmail.com> |
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