Dear Analog Devices Support Team,
I am currently working in a research lab that focuses on building wearable EDA/GSR sensors. We are using the MAX30001G and the MAX30001G-EVKIT for our development since the datasheet specifically mentions that it is suitable for EDA/GSR applications. However, we are encountering difficulties in determining the optimal register and electronics configuration options for EDA/GSR measurements.
The available documentation primarily provides information on respiration and heart rate monitoring but lacks specific details for EDA applications. The only relevant information we found in the EVKIT datasheet states:
"When using the BioZ channel for GSR measurements, two dry electrodes should be used to focus the measurement on the skin’s contact impedance. A lower current generator frequency, such as 125Hz, 250Hz, or 500Hz should be selected. Ensure that the BioZ receiver’s analog high pass filter cutoff frequency is set below this stimulus frequency. At these lower frequencies, a 220nF DC blocking capacitor should be used between both DRVP and DRVN and their respective electrode. GSR impedance measurements are typically as high as 1MΩ but maybe as high as 10MΩ under low-moisture conditions. Choose lower current generator amplitudes so that the differential voltage at the BioZ input channel does not exceed the maximum AC input differential range of ±90 mV. Figure 19 illustrates the setup for GSR measurements."
To proceed effectively with our research, we would appreciate any of the following:
Recommended Configuration: Detailed recommended register settings for EDA/GSR measurements, either as screenshots of the EVKIT software or a comprehensive list.
Tutorial: Any available tutorial or guide specifically tailored for configuring the MAX30001G for EDA/GSR measurements.
Electrode Configuration: Recommendations on whether to use a 2-electrode or 4-electrode configuration for the BioZ channel in EDA/GSR measurement scenarios and recommended electrode materials and types (silver thread, steel, gold contacts)
These clarifications will significantly advance our research, as the EDA signal responses are challenging to replicate, making it hard to test and compare various configurations effectively.
Thank you in advance for your assistance.
Best regards,
Vignesh Ravichandran
University of Rhode Island
