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