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.
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The GGHC biosensor GSR sensor is based on a earlier version of Sean's work. His latest GSR is the Truth Wristband v5. This circuit has just a low pass filter with the high pass filter done in software on the PIC.