Product description
Parameters:
LED peak wavelength: 660nm/880nm
LED power supply voltage: 3.3~5v
Detection Signal Type: Optical Reflection Signal (PPG)
Output Signal Interface: I2C Interface
Communication Interface Voltage: 1.8 ~ 5V

Interface:
VIN: Main power input, 1.8V-2.5V
3-bit pad: I2C bus pull up level, you can choose 1.8V or 3.3V according to the pin master voltage.
SCL: I2C bus clock
SDA: connected to the I2C bus data
INT: MAX chip interrupt pin
RD: MAX30102 chip's RD LED grounding terminal, generally doesn't need to connect
IRD: MAX30102 chip's IR LED grounding terminal, generally doesn't need to connect
GND: grounding wire

OLED Display Module Specifications:
Size: 0.91 inch OLED
Resolution: 128 x 32
Size: 38 * 12 mm
Interface Type: IIC interface
Display Color: White
Pin Description:
GND: Power Ground
VCC: Power + (DC 3.3 ~5v)
Operating temperature:-40 ~ 85 ℃
SCL: Clock Line
SDA: Data Line

Package Include:
2 x MAX30102 Heart-Rate Sensor Module
1 x pin header kit
1 x 20PIN male and female DuPont cable