October 31, 2012
Just so people are aware: EEG is not some magical technology that allows you to easily read brain waves. The electrical signals generated by your brain are on the order of MICROvolts by the time they reach your scalp. They have to go through both a layer of bone and tissue, causing them to be attenuated significantly. As a comparison, when you blink your eyes, the electrical potential generated is on the order of a few millivolts, or a thousand times higher than brain waves.
Most clinical EEG headsets have over 32 electrodes and require lengthy preparation by scraping away dead skin between the scalp and electrode as well as applying a conductive gel. They are then amplified by very high quality, very low noise, and very expensive amplifiers. Once the signal is in software, they average 8-16 epochs to get a usable signal to noise ratio.
So what I’m trying to say is it takes thousands of dollars of equipment to get usable EEG signals, and even then you generally can’t use them in real-time. There’s no way this headset with a single dry electrode is going to come close to competing with that. Do not expect great results, if any, as Sparkfun has said themselves.
Source: I was a biomedical engineering student and spent a lot of time researching this technology and talking with people that use it on a daily basis.
about a year ago
You left out the headers.
about 2 years ago
If I want to power this with the 3.7V Polymer Lithium Ion Battery (https://www.sparkfun.com/products/8483), do I run it through the regulator or connect it straight to Vcc? It looks as though RAW is regulated and Vcc is not by the schematic. Can someone confirm this? Thanks
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