One of the most interesting projects for us personally is also Scott Hardens sound card ECG

Last Updated on January 20, 2023 by pg@petergamma.org

https://swharden.com/blog/2019-03-15-sound-card-ecg-with-ad8232/

It is interesting to test it, to replace the sound card by a 16 bit a/d converter, make a 3 lead ECG device out of it, test a variant with the DFROBOT optical heart rate sensor, test it with HeartPy, attach it to an ESP32 module and Home Assistant, export sensor data to InfluxDB, analyse it with HeartPy and associate with the Swiss Federal Institute of Technology in Zurich and write a validation paper about it.