AD8232 ECG Heart Rate Monitor Sensor Module

The AD8232 is a purpose-built analog front-end chip for reading a single-lead ECG signal, and this breakout board wraps it in a form a hobbyist project can actually use. It filters and amplifies the tiny electrical signal from disposable ECG electrodes into a clean analog waveform an Arduino ADC can sample directly, handling the noise rejection and gain stages that would otherwise take a shelf of discrete op-amp circuitry.

Three-electrode leads connect to the board, and the module outputs the conditioned signal alongside leads-off detection so software can tell when an electrode has lost contact - important for anything meant to run unattended. It operates from a 3.3V rail, matching most modern microcontroller boards without a separate supply.

It is aimed at heart rate monitoring projects, wearable prototypes and biomedical engineering coursework rather than diagnostic use - genuine medical ECG equipment goes through a different certification path entirely.