The KY-039 Finger Detection Heartbeat Sensor is designed to measure heart rate using infrared light reflection. It operates by detecting blood flow changes in the fingertip using an infrared LED and a phototransistor. When the heart pumps blood, the amount of light absorbed changes, allowing the sensor to detect pulse fluctuations.
This sensor provides an analog output, making it easy to integrate with Arduino, Raspberry Pi, ESP32, and other microcontrollers for health monitoring projects. Due to its compact size and low power consumption, it is widely used in DIY health monitoring systems, wearable devices, and biofeedback applications.
Although not a medical-grade device, the KY-039 sensor is a great tool for experimentation, educational purposes, and research in heart rate variability analysis.
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