The MAX30102 is an integrated pulse oximetry and heart-rate monitor module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection.
The MAX30102 provides a complete system solution to ease the design-in process for mobile and wearable devices. The MAX30102 operates on a single 1.8V power supply and a separate 3.3V power supply for the internal LEDs. Communication is through a standard I2C-compatible interface. The module can be shut down through software with zero standby current, allowing the power rails to remain powered at all times.
Working Principle
Light-dissolving method: measuring the pulse and blood oxygen saturation by using human tissue to cause different light transmittance when the blood vessel beats;Light source: a specific wavelength illuminating pole tube selective for oxyhemoglobin (HbO2) and hemoglobin (Hb) in arterial blood;
Transmittance is converted into electrical signal: the volume of the arterial pulsation is changed to the light transmittance of the light. At this time, the light is reflected by the human body tissue by photoelectric conversion, converted into an electrical signal and amplified and output.
Pin Description
VIN - main power supply input terminal 1.8V-5V; 3-bit pad: Select the pull-up level of the bus, depending on the pin master voltage,select 1.8v or 3.3V (this terminal contains 3.3V and above)
SCL - Connect the clock of I2C bus
SDA - data connected to the I2C bus
INT - Interrupt pin of the MAX30102 chip
RD - RED of the MAX30102 chip, LED ground terminal, - generally not connected
IRD - The IR, LED grounding of the MAX30102 chip is generally not connected
GND - Ground wire
Applications
● Wearable Devices
● Fitness Assistant Devices
● Smartphones
● Tablets
Resources:
1. Interfacing MAX30102 Pulse Oximeter and Heart Rate Sensor with Arduino