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Biosensor Array Galvanic Skin Response (view source)
Revision as of 18:46, 1 May 2011
, 18:46, 1 May 2011no edit summary
====== This page is part of the [[Biosensor Array]] Project ======
====== This page is part of the [[Biosensor Array]] Project ======
== Team Members ==
== Links ==
Primarily researched and prototyped by Drew Fustini after handover from Phil Strong. Please check with Drew for any clarification.
== Prototype ==
Primary source of prototype is: [http://produceconsumerobot.com/truth/ Truth Wristband]
Sean Montgomery, owner of the above site, has a GSR circuit that uses no micrcontroller and a low & high pass filter in the circuit to create a 0.48Hz to 4.8Hz band pass:
Schematic
http://produceconsumerobot.com/truth/content/GSR_schematic_04.png
This circuit was created by Sean for an earlier version of his Truth Wristband project. This circuit is used at as the biosensor array GSR prototype as it produces a simple analog output that is already filtered. This reduces the complexity of the Arduino code and the graphing display application on the computer.
The circuit is featured in Make Magazine Vol 26 (Spring 2011) in the biosensor article written by Sean.
Make Magazine is now selling a kit on Maker Shed for this circuit:
http://blog.makezine.com/archive/2011/04/new-in-the-maker-shed-galvanic-skin-response-kit.html
A video of the assembly and operation is on that page as well.
== Truth Wristband ==
The prototype is based on a earlier version of Sean's work. His latest is the Truth wristband. This circuit has just a low pass filter with the high pass filter done in software on the PIC.
* Truth Wristband kit video
** http://www.youtube.com/watch?v=_br59dghZgI
* Truth Wristband kit Maker Shed:
** http://www.makershed.com/ProductDetails.asp?ProductCode=MKSM1&Click=19209
== 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. This would have been a good measurement for the biosensor array but Drew was not able to get their circuit to work correctly.
== Related Links ==
* Arduino GSR project with Processing (with Op Amps): http://www.chris3000.com/archive/galvanic-skin-response/
* Arduino GSR project with Processing (with Op Amps): http://www.chris3000.com/archive/galvanic-skin-response/
