Biosensor Array Galvanic Skin Response: Difference between revisions
From Pumping Station One
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== Measuring Actual Skin Conductance == | == Measuring Actual Skin Conductance == | ||
Some projects like the [http://courses.cit.cornell.edu/ee476/FinalProjects/s2006/hmm32_pjw32/index.html Cornell EDA] project used a Wheatstone bridge and op-amp (configured as difference amp). With this circuit and microcontroller software, they were able to calculate the exact resistance of the skin and thus the skin conductance. | Some projects like the [http://courses.cit.cornell.edu/ee476/FinalProjects/s2006/hmm32_pjw32/index.html Cornell EDA] project used a Wheatstone bridge and op-amp (configured as difference amp). With this circuit and microcontroller software, they were able to calculate the exact resistance of the skin and thus the skin conductance: | ||
http://courses.cit.cornell.edu/ee476/FinalProjects/s2006/hmm32_pjw32/hardware.png | |||
This would have been a good measurement for the biosensor array but Drew was not able to get their circuit to work correctly. Drew tried both with LM324 quad opamp using 2x voltage follower (to buffer) and 1x as the difference amplifier but saw no signal on the scope. Drew also tried using dual Micrcochip Op-Amp MCP6002 as voltage follower to buffer each input going into the TI INA114 instrumentation amp. | This would have been a good measurement for the biosensor array but Drew was not able to get their circuit to work correctly. Drew tried both with LM324 quad opamp using 2x voltage follower (to buffer) and 1x as the difference amplifier but saw no signal on the scope. Drew also tried using dual Micrcochip Op-Amp MCP6002 as voltage follower to buffer each input going into the TI INA114 instrumentation amp. | ||
