Explore the fascinating world of electrocardiography in this 36-minute EuroPython 2021 conference talk. Dive into the mechanics of the human heart, understand how ECG sensors function, and learn to construct a basic ECG using Arduino or similar microcontrollers. Discover the applications of pulse sensors in various devices and contexts, particularly in the medical field. Gain insights into data analysis techniques and machine learning applications for ECG data. From echocardiography and real-time MRI to the physiology of heart cells, cover a wide range of topics related to cardiac monitoring. Engage with practical demonstrations of data science techniques, including 2D histograms and CNN-based beat detection, to enhance your understanding of heartbeat analysis for hackers.