We just finished our testing with the ECG signal quality and we are happy to say that we got some pretty good signal quality. The below picture shows the heartyPatch being tested with a desktop application. For the sake of testing, we set up a TCP socket-based server on the heartyPatch's ESP32 itself and connected to the server using TCP client running in processing. While this may not be the best way to utilize battery power, it allowed to test for things like motion artifacts in real-time.

We made a video of the several test steps that we went through and the results of the testing. Check it out below.

We're quite satisfied with the results at this point, although some level of digital filtering would be required to remove both the remaining baseline wandering and the occasional random noise. Next steps would be (what we're working on currently):

• Smartphone/Desktop app for BLE connection and data display
• Transferring the data to AWS (only HR and R-R interval data)