Difference between revisions of "Biosensor Array ECG/EKG"
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| + | [[Category:Biosensor Array]] | ||
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| + | ====== This page is part of the [[Biosensor Array]] Project ====== | ||
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| + | == EKG Circuit Update ([http://www.element14.com/community/groups/pumping-station-one/blog/2011/04/01/ekg-circuit-update element14 post]) == | ||
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| + | 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. | ||
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| + | [[File:EEG-EKG-Amplifier.JPG|thumb|EEG-EKG-Amplifier.JPG|text| EEG EKG Amplifier based on Open EEG Design]] | ||
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| + | [[File:SallenKeyLP.gif|thumb|alt=SallenKeyLP.gif|text|The low pass filter diagram.]] | ||
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| + | After amplifying the signal and filtering it to remove the power line signal of 60 Hz, we may amplify the signal again and pass it into the main Arduino for some processing before it gets sent to the Master Controller that's sending all the data off of the sensor array. | ||
| + | |||
| + | But we'll have to build the signal amplifier first. We will use a design close to the reference design from the INA114 instrumentation amplifier datasheet, design also based on the Open EEG project design. I'll post an update after my build this weekend. | ||
| + | |||
| + | == Notes == | ||
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Desired filter range: .05-150 Hz | Desired filter range: .05-150 Hz | ||
== 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] | ||
Latest revision as of 19:18, 11 April 2018
This page is part of the Biosensor Array Project
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.
After amplifying the signal and filtering it to remove the power line signal of 60 Hz, we may amplify the signal again and pass it into the main Arduino for some processing before it gets sent to the Master Controller that's sending all the data off of the sensor array.
But we'll have to build the signal amplifier first. We will use a design close to the reference design from the INA114 instrumentation amplifier datasheet, design also based on the Open EEG project design. I'll post an update after my build this weekend.
Notes
Desired filter range: .05-150 Hz
Resources
- Open ECG Project
- Neozap - A personal project with some good info on ECG builds
- Butterworth filter calculators
- Introduction to Biomedical Engineering - John D. Enderle et al - PDF on Google Docs
- Wireless ECG
- Open EEG Project