Biosensor Array ECG/EKG - Revision history

Mct: add category

2018-04-11T19:18:55Z

add category

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			[[Category:Biosensor Array]]

	====== This page is part of the [[Biosensor Array]] Project ======		====== This page is part of the [[Biosensor Array]] Project ======

Hef: Robot: Cosmetic changes

2014-03-17T14:16:35Z

Robot: Cosmetic changes

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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]) ==		== 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]]
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	== 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]

Danman: /* Resources */

2011-04-18T00:23:57Z

Resources

← Older revision		Revision as of 00:23, 18 April 2011
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Danman: /* Resources */

2011-04-18T00:23:57Z

Resources

← Older revision		Revision as of 00:23, 18 April 2011
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	*[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]

Danman: /* EKG Circuit Update (element14 post) */

2011-04-18T00:22:32Z

EKG Circuit Update (element14 post)

← Older revision	Revision as of 00:22, 18 April 2011
(No difference)

Danman: /* EKG Circuit Update (element14 post) */

2011-04-18T00:22:32Z

EKG Circuit Update (element14 post)

← Older revision		Revision as of 00:22, 18 April 2011
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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.		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:SallenKeyLP.gif\|thumb\|alt=SallenKeyLP.gif\|text\|The low pass filter diagram.]]		[[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.		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.

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

	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.		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.

Danman at 00:08, 18 April 2011

2011-04-18T00:08:04Z

← Older revision		Revision as of 00:08, 18 April 2011
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Danman at 00:08, 18 April 2011

2011-04-18T00:08:04Z

← Older revision		Revision as of 00:08, 18 April 2011
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	[[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]]

	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, design also based on the Open EEG project design. I'll post an update after my build this weekend.		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 ==		== Notes ==

Danman: /* EKG Circuit Update (element14 post) */

2011-04-18T00:06:13Z

EKG Circuit Update (element14 post)

← Older revision	Revision as of 00:06, 18 April 2011
(No difference)

Danman: /* EKG Circuit Update (element14 post) */

2011-04-18T00:06:13Z

EKG Circuit Update (element14 post)

← Older revision		Revision as of 00:06, 18 April 2011
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	[[File:SallenKeyLP.gif\|thumb\|alt=SallenKeyLP.gif\|text\|The low pass filter diagram.]]		[[File:SallenKeyLP.gif\|thumb\|alt=SallenKeyLP.gif\|text\|The low pass filter diagram.]]

	After ~~building~~ the ~~filters~~, we~~'ll~~ amplify the signal and pass it into a ~~dedicated~~ ~~arduino~~ for some processing before it gets sent to the Master Controller that's sending all the data off of the sensor array.		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.
⚫

			[[File:EEG-EKG-Amplifier.JPG\|thumb\|EEG-EKG-Amplifier.JPG\|text\| EEG EKG Amplifier based on Open EEG Design]]
	But I'll have to build those sensors first. I'm currently on my third try. I made the same mistake on the first two: not reading closely enough the spec sheet on the op amps I was using. The first one didn't work at all, but the second one cutoff at the correct frequency. It also clipped all of the negative input. This time I've read the spec sheet thoroughly, and I'm feeling good about getting it working. I'll post an update after my build this weekend.
		⚫
			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, design also based on the Open EEG project design. I'll post an update after my build this weekend.

	== Notes ==		== Notes ==