Description:The MAX30102 is an integrated pulse oximeter and heart rate monitor biosensor module. It integrates a red LED and an infrared LED, photodetectors, optical devices, and low-noise electronic circuits with ambient light suppression. The MAX30102 uses a 1.8V power supply and a separate 5.0V power supply for internal leds for heart rate and blood oxygen collection in wearable devices, worn on fingers, earlobes and wrists. The standard I2C-compatible communication interface can transmit the collected values to Arduino, KL25Z and other microcontrollers for heart rate and blood oxygen calculation. In addition, the chip can also turn off the module through software, and the standby current is close to zero, so that the power supply is always maintained. Because of its excellent performance, the chip is widely used in Samsung Galaxy S series mobile phones. Compared with the previous product MAX30100, the chip integrates a glass cover to effectively eliminate external and internal light interference, and has the best reliable performance.Main parameters:LED peak wavelength :660nm/880nmLED supply voltage :3.35vDetection signal type: Light Reflected Signal (PPG)Output signal interface :I2C interfaceCommunication interface voltage :1.83.3V5V(optional)Size of reserved assembly hole :0.5x8.5mmPrinciple description photolysis method: The use of human tissue in the blood vessel pulsation caused by different light transmittance to measure the pulse and blood oxygen saturation: light source: the use of oxygenated hemoglobin (HbO2) and hemorubin (Hb) in the blood of the specific wavelength selective luminescent emg transmittance into electrical signals: arterial pulsation congestion volume changes cause the light transmittance of this beam of light At this time, the photoelectric converter receives the reflected light through the body tissue, converts it into an electrical signal and amplifies and outputs it.Pin description VIN:Main power input,1.8V-5V;3-position pad: Select the pull-up level of the bus, depending on the pin master voltage, 1.8v end or 3.3v end (this end includes 3.3V and above)SCL: Clock connected to the I2C busSDA: data connected to the I2C busINT: Interrupt pin of MAX30102 chip;RD: The RED LED ground terminal of the MAX30102 chip is generally not connectedIRD:MAX30102 chip IR LED grounding terminal, generally not connected;GND: Ground cable.