The Finger Detection Heartbeat Measuring Sensor Module uses an infrared LED (a light-emitting diode that emits invisible infrared light) and a phototransistor (a light-sensitive transistor) to detect the pulse in your fingertip. Place a finger over the sensor, and the ky-039 heartbeat sensor module reads tiny changes in light absorption caused by blood flowing through the finger with each heartbeat. It outputs an analog voltage that rises and falls with each pulse. The sensor runs on 3.3V to 5V DC and outputs through a standard analog pin.
The ky 039 heartbeat sensor datasheet confirms the sensor uses the photoplethysmography (PPG) technique — the same method used in medical pulse oximeters. One non-obvious detail — ambient light directly hitting the sensor from above causes noise in the output signal. Reading in a bright room or under direct light will distort the waveform. The honest limitation is that this module gives a raw analog waveform, not a direct BPM number. You need to process the signal in software to calculate beats per minute.
The finger detection module connects to the analog input of Arduino IDE, PlatformIO, and MicroPython environments. For Medical students and biomedical project makers, building health monitors all use it. To start, power with 5V, connect the analog output to an Arduino analog pin, and read values in the serial monitor. StemVolt offers fast and reliable delivery of across India with trusted service support.
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Features:
- Infrared LED and phototransistor pair at 3.3V to 5V detects blood pulse changes through fingertip skin
- Sensor type rated as heart rate sensor suits biomedical signal processing and health monitoring projects
- finger detection sensor compact PCB fits directly on a standard breadboard for fast prototype testing
Technical specifications:
| Specification | Details |
|---|---|
| Model | Heart Rate Sensor |
| Item Type | Sensor |
| Operating Voltage | 3.3V – 5V |
| Interface | Analog pin |
Applications:
- Heartbeat display project uses this sensor to show pulse rate on an LCD screen in real time
- Health monitor project reads the analog waveform and counts peaks to calculate beats per minute
- Finger Detection Heartbeat Measuring Sensor Module feeds pulse data to an Arduino for a wearable health band
- ky 039 sensor reads photoplethysmography signal and sends BPM data via serial to a Raspberry Pi
Package includes:
- 1 x KY-039 Finger Detection Heartbeat Measuring Sensor Module
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