The Pulse Oximeter and Heart Rate Sensor Module uses light to measure two things at once — blood oxygen level and heart rate. The MAX30102 pulse sensor sits inside a tiny 5.6mm x 2.8mm package. It works at just 1.8V to 3.3V, so it runs comfortably on battery power.
The heart rate sensor module uses infrared and red LEDs to shine light through skin and reads the reflected signal. One non-obvious fact: motion on the wrist causes reading errors, so finger placement matters more than people expect. The honest trade-off is that pulse oximeter max30102 readings need stable contact to stay accurate.
The max30102 pulse oximeter sensor pairs with Arduino and ESP32 over I2C (a two-wire communication interface). Medical project and health monitoring projects for use it module. Connect SDA and SCL pins, load a library, and readings appear within seconds. StemVolt provide this Pulse Oximeter module pre-configured, and ready to use, ensuring reliable performance and easy integration into projects.
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Check out the Finger Detection Heartbeat Measuring Sensor Module
Features:
- Operates at 1.8V to 3.3V DC allowing use in battery-powered wearable builds.
- I2C interface uses only two signal pins for clean microcontroller connection.
- Measures blood oxygen and heart rate simultaneously through one sensor chip.
- MAX30102 pulse sensor uses onboard LEDs that eliminate any external light source need.
Technical specifications:
| Specification | Details |
|---|---|
| Sensor Type | Pulse oximeter and heart rate sensor |
| Operating Voltage | 1.8 ~ 3.3V |
| Dimensions (mm) | 5.6mm x 2.8mm x 1.2mm |
| Interface | I2C Interface with Input PINs |
Applications:
- A health monitor build reads blood oxygen levels and alerts when they drop low.
- The Pulse Oximeter and Heart Rate Sensor Module logs body data to an SD card continuously.
- A wearable ESP32 project collects heart rate at 3.3V and displays readings on an OLED screen.
Package includes:
- 1 x MAX30102 Pulse Oximeter and Heart Rate Sensor Module


















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