The Heart Rate Sensor Module MAX30102 is designed for pulse detection and blood oxygen concentration measurements, compatible with Arduino and STM32 microcontrollers.

Principle Description

The MAX30102 utilizes the light-absorption method to measure pulse and blood oxygen saturation. This involves analyzing the changes in transmittance caused by variations in arterial blood volume. The sensor employs specific-wavelength LEDs that selectively interact with oxyhemoglobin (HbO2) and deoxyhemoglobin (Hb) in arterial blood. The variation in arterial volume results in corresponding changes in light transmittance, which are then converted into electrical signals for analysis. This process enables accurate pulse and blood oxygen measurements.

Features

• Integrates a red LED, an infrared LED, a photodetector, optical equipment, and a low-noise electronic circuit.
• It is designed to suppress ambient light for precise measurements.
• Utilizes a standard I2C compatible communication interface for data transmission to microcontrollers like Arduino and KL25Z, enabling heart rate and blood oxygen calculations.
• Suitable for wearable devices used on fingers, earlobes, wrists, and other areas to collect heart rate and blood oxygen data.
• The module can be turned off via software, reducing standby current to nearly zero, ensuring continuous power supply.
• LED peak wavelengths: 660nm (red) and 880nm (infrared).
• LED power supply voltage: 3.3V to 5V.
• Detection Signal Type: Optical Reflection Signal (PPG).
• Output Signal Interface: I2C Interface.
• Communication Interface Voltage: 1.8V to 3.3V to 5V.
• Reserve Mounting Hole Size: 0.5mm x 8.5mm.

Interface

• VIN: Main power input (1.8V-5V).
• Detection Signal Type: Light Reflection Signal (PPG)
• 3-bit pad: I2C bus pull-up level (1.8V or 3.3V selectable according to the pin master voltage).
• SCL: I2C bus clock.
• SDA: I2C bus data.
• INT: MAX30102 chip interrupt pin.
• RD: MAX30102 chip’s RED LED grounding terminal (usually not needed to connect).
• IRD: MAX30102 chip’s IR LED grounding terminal (usually not needed to connect).
• GND: Grounding wire.
• Package Dimensions: ‎12.4 x 7.8 x 2.6 cm
• Package Weight: 20 Grams