links ecg arduino

https://drive.google.com/open?id=1PDHLUVDccklVqfcQXjTLTCoAw2q0lRBG



online

http://embedded-lab.com/blog/heart-rate-monitoring-internet-using-esp8266/



nodemcu  gardening

http://embedded-lab.com/blog/post-data-google-sheets-using-esp8266/

https://www.hackster.io/phantom_override/building-a-electrocardiogram-with-windows-iot-and-azure-8b2b44