analogdevicesinc/max32655_max30009

MAX32655 code to communicate with the MAX30009 through SPI

Description

This project records galvanic skin response (GSR) or electrodermal activity (EDA) using the MAX30009 with the MAX32655 microcontroller.

The values for I-Phase, Q-Phase, BIOZ and adjusted BIOZ are printed to a file that can then be analysed or plotted

Software

Project Usage

• As is, when run, the program will wait 100 counts and then print the Quadrature Phase, In Phase, BIOZ and adjusted BIOZ in four separate columns as below:

Quad Phase	In Phase	BIOZ	Adjusted BIOZ
12291.000000	9556.000000	51515.124947	46353.879949
12290.000000	9560.000000	51520.638092	46359.450341
12295.000000	9555.000000	51523.544096	46362.386522
12293.000000	9552.000000	51512.227608	46350.952527
12291.000000	9556.000000	51515.124947	46353.879949
12296.000000	9549.000000	51513.977253	46352.720338
12294.000000	9556.000000	51522.962058	46361.798440
12300.000000	9559.000000	51544.729169	46383.791646
12302.000000	9555.000000	51541.834769	46380.867176
12302.000000	9555.000000	51541.834769	46380.867176
12290.000000	9556.000000	51512.512737	46351.240616
12291.000000	9551.000000	51504.971749	46343.621338
12294.000000	9551.000000	51512.810405	46351.541374
12296.000000	9554.000000	51524.126552	46362.975027
12293.000000	9551.000000	51510.197439	46348.901280
12294.000000	9554.000000	51518.900999	46357.695210
12291.000000	9555.000000	51513.094043	46351.827957
12287.000000	9550.000000	51492.490675	46331.010712
12293.000000	9555.000000	51518.318909	46357.107075
12298.000000	9556.000000	51533.412660	46372.357580
12299.000000	9554.000000	51531.965481	46370.895369
12294.000000	9555.000000	51520.931462	46359.746757
12286.000000	9552.000000	51493.939813	46332.474891

• These must also be printed to a separate .txt file that can be done by turning on the Toggle File Logging and choosing a Log File Directory:

Project-Specific Build Notes

• Visual Studio Code that is capable of writing/compiling C programs.
• MATLAB or Excel to plot outputs.

Setup

Hardware needed

• Connect the MAX32655FTHR to the MAX30009EVKIT via SPI lines
• Connect jumpers J5 and J7, leaving J4, J6, J7 and J8 open
• Replace the capacitors C5, C6, C7 and C8 with capacitors of at least 220nF
• Use two wet or dry electrodes on the wrist, connected 4cm apart