AD8232 ECG Monitor Sensor Module

A heartbeat's electrical signal at the skin's surface is only a few millivolts, far too small and noisy for a microcontroller's ADC to read directly, so the AD8232 chip on this module does the heavy lifting of amplifying and filtering that tiny signal into a clean, usable waveform first. Paired with three disposable electrode pads, it lets a hobby project capture an actual single-lead ECG trace, the same basic waveform shown in medical heart-rate monitors, making it a popular sensor for DIY biometric and health-monitoring projects, heart-rate variability experiments, and biosignal-processing coursework. A built-in leads-off detection output also flags when an electrode has lost skin contact, which is useful for catching bad readings before they get logged as real data.