Heartbeat Sensor (Finger Measuring)

KY-039 Mini Finger Heartbeat Measuring Sensor Module
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  • Frequency: 50 to 60 Hz
  • Voltage: 3.3-5V
  • Current Rating: Less than 12mA
  • Wavelength: 850-940nm (typical)
  • Dimensions:  25 x 22 x 17mm

The Heartbeat Sensor Module is used to detect the heart rate of an individual by detecting changes in infrared light shining through a fingertip.

This project uses bright infrared (IR) LED and a phototransistor to detect the pulse of the finger, a red LED flashes with each pulse.

Pulse monitor works as follows: The LED is the light side of the finger, and phototransistor on the other side of the finger, phototransistor used to obtain the flux emitted when the blood pressure pulse by the finger when the resistance of the phototransistor will be slightly changed.

We chose a very high resistance resistor R1 because most of the light through the finger is absorbed, it is desirable phototransistor sensitive enough. Resistance can be selected by experiment to get the best results.

The most important is to keep the shield stray light into the phototransistor. For home lighting that is particularly important because the lights at home mostly based 50HZ or 60HZ fluctuate, so faint heartbeat will add considerable noise.

As a simple module, it will suit use within a large range of projects based on microcontrollers such as Arduino boards and the Raspberry Pi. The module has an M2 mounting hole allowing for its easy attachment to a multitude of surfaces.