KY-039 Finger Detection Heartbeat Measuring Sensor Module:

 The KY-039 Heartbeat Sensor Module offers a low-cost and beginner-friendly solution for detecting pulse rate through a fingertip. Using a combination of an infrared LED (IR LED) and a phototransistor, it measures subtle changes in blood volume in the finger, which correspond to heartbeat pulses.

Perfect for Arduino-based projects, academic demonstrations, and biomedical experimentation, the KY-039 is a great starting point for anyone interested in health monitoring technologies.

Whether you’re building a basic heart rate counter, a wearable project, or an IoT health prototype, this compact sensor module is a handy tool to have in your kit.

How It Works

The KY-039 module shines an infrared light through the finger using its IR LED. The amount of light absorbed by the finger changes with blood flow (pulse). The phototransistor detects these fluctuations and outputs an analog signal that can be read by an analog input pin on your microcontroller.

By plotting this signal over time or applying a basic filter, you can extract heartbeat signals and determine pulse rate.