ECG Project With All The Messy Safety Details | Hackaday
Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and 'Penny Electrodes' « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Designing an Arduino-based ECG monitor using an AD8232 ECG sensor
Experimental Setup of Portable ECG with Bluetooth feature | Download Scientific Diagram
AD8232 ECG Sensor & Arduino Interfacing with ECG Graph