Changes

== EKG Circuit Update ([http://www.element14.com/community/groups/pumping-station-one/blog/2011/04/01/ekg-circuit-update element14 post]) ==

== EKG Circuit Update ([http://www.element14.com/community/groups/pumping-station-one/blog/2011/04/01/ekg-circuit-update element14 post]) ==

When your heart beats, it generates an electrical current, or signal. The range of that signal can vary from .05 Hz to 150 Hz. Anything outside of that range isn't coming from your body, so to the first step in building our EKG sensor is to filter out all signals that outside of that range. We're doing that using two second order Butterworth filters (one high-pass and one low-). I used this hand dandy online filter calculator to figure out what components I would need.

When your heart beats, it generates an electrical current, or signal. The range of that signal can vary from .05 Hz to 150 Hz. Anything outside of that range isn't coming from your body, so to the first step in building our EKG sensor is to filter out all signals that outside of that range. We're doing that using two second order Butterworth filters (one high-pass and one low-). I used this hand dandy online filter calculator to figure out what components I would need.

[[File:EEG-EKG-Amplifier.JPG|thumb|EEG-EKG-Amplifier.JPG|text| EEG EKG Amplifier based on Open EEG Design]]

[[File:EEG-EKG-Amplifier.JPG|thumb|EEG-EKG-Amplifier.JPG|text| EEG EKG Amplifier based on Open EEG Design]]

== Resources ==

== Resources ==

*[http://http://www.open-ecg-project.org Open ECG Project]

* [http://http://www.open-ecg-project.org Open ECG Project]

*[http://www.neozap.com/index.htm Neozap] - A personal project with some good info on ECG builds

* [http://www.neozap.com/index.htm Neozap] - A personal project with some good info on ECG builds

*[http://daycounter.com/Filters/ Butterworth filter calculators]

* [http://daycounter.com/Filters/ Butterworth filter calculators]

*[https://docs.google.com/leaf?id=0B7nuloU9uXq2ZTgwYjBkMjctY2E5OS00N2M5LWJlMGQtYTY4NTIxMzYwNjBl&hl=en&authkey=CNCbmd0E Introduction to Biomedical Engineering - John D. Enderle et al] - PDF on Google Docs

* [https://docs.google.com/leaf?id=0B7nuloU9uXq2ZTgwYjBkMjctY2E5OS00N2M5LWJlMGQtYTY4NTIxMzYwNjBl&hl=en&authkey=CNCbmd0E Introduction to Biomedical Engineering - John D. Enderle et al] - PDF on Google Docs

*[http://instruct1.cit.cornell.edu/courses/bionb440/FinalProjects/f2005/kwj5/index.html Wireless ECG]

* [http://instruct1.cit.cornell.edu/courses/bionb440/FinalProjects/f2005/kwj5/index.html Wireless ECG]

*[http://openeeg.sourceforge.net/doc/ Open EEG Project]

* [http://openeeg.sourceforge.net/doc/ Open EEG Project]