Just when you thought you’d seen an Arduino do everything ... [birdyberth] makes note that the circuit is only safe if battery power is used. The “heart” of any ECG is an instrumentation ...

Other than the circuit itself ... a writer here include a biomedical sensor suite in Arduino shield form factor, and a simple ECG built around an AD623 instrumentation amplifier.

The instrument is made by German company Medical Imaging Electronics and uses a wave produced by the ECG to electronically control a separate recording or imaging apparatus. At first look ...