KY-039 Finger Detection Heartbeat Sensor

A compact optical pulse sensor made to detect heartbeat signals from a fingertip. It uses an IR LED and phototransistor to sense small blood-flow changes and sends them as an analog signal. Features: Detects pulse from a fingertip Uses IR LED and phototransistor Analog signal output 3-pin connection Works with 3.3V or 5V Compact and easy to use Suitable for Arduino and similar boards Applications: Heartbeat detection projects Arduino health-monitoring builds Fitness and pulse projects Biomedical school projects Sensor experiments DIY electronics