Place the electrodes on your chest as shown in the picture and connect the USB-C connector with the USB symbol downwards. After starting the ECG application on your Card10 press the right lower button (RIGHT) to switch over to ECG over USB.
If you want to start logging your ECG data press the lower left button (LEFT) to start and stop logging. Log files are written to the filesystem (ecg-<time>.log) and can be transferred to a computer using the boot loader. You can read them with Audacity: Use File→Import→Raw Data, select the log file, then use Signed 16-bit PCM, Little Endian, 1 Channel, offset 0, amount 100% and sample rate 128 Hz. Select the entire track (Ctrl-A), use Effect→Amplify and keep the suggested Amplification value.
If you want to start logging your ECG data press the lower left button (LEFT) to start and stop logging. Log files are written to the filesystem (ecg-\<time\>.log) and can be transferred to a computer using the boot loader. You can visualize them with Audacity: Use File→Import→Raw Data, select the log file, then use Signed 16-bit PCM, Little Endian, 1 Channel, offset 0, amount 100% and sample rate 128 Hz. Normalize the amplitude by selecting the entire track (Ctrl-A), then use Effect→Amplify and keep the suggested Amplification value.
#### Eye movement detection and muscle activity
To detect eye movements like fast movements to the left or right or to detect REM phase while at sleep, place your electrodes on your temples.
