Heart-Rate Pulse Sensor & Oximeter MAX30102

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 an independent 5.0v power supply for internal LED, which is applied to wearable devices for heart rate and blood oxygen collection and detection, and is worn on fingers, earlobes and wrists. The standard 12c-compatible communication interface is high to transmit the collected values to Arduino, KL25Z and other SCM for heart rate and blood oxygen calculation. In addition, the chip can also be closed by the software module, standby current is close to zero, the power supply to maintain the state of supply. Because of its excellent performance, the chip is widely used in samsung Galaxy S7 phones. Compared with the previous generation product MAX30100, the MAX30102 integrated glass cover can effectively eliminate the external and internal light interference, has the optimal and reliable performance.
The heart rate blood oxygen sensor module is a biosensor module made according to the power requirements of MAX30100/MAX30102. Its 12C communication interface voltage is compatible with 1.8v /5V, and can be developed with conventional MCU board
KL25Z, stm32, etc. In addition, it also provides the corresponding heart rate and blood oxygen program, which can be easily used to complete the monitoring of heart rate and blood oxygen concentration in cooperation with a variety of development boards. It is suitable for scientific research and teaching demonstration on heart rate and blood oxygen, and is also very suitable for secondary development.
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 5.0V 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.

Features:

• Can be used with free Algorithm
• Highly integrated.
• Small-size sensor
• Non-chest based heart rate/SpO2 detection
• Ultra-low power consumption

Specifications:

• Circuit board size: 15x20mm
• Circuit board thickness: 2.5mm
• Module function: measure heart rate, measure blood oxygen concentration, measure temperature supply voltage: 1.8v-5v
• Detection signal type: light reflection signal (PPG)
• Output signal interface: 12C interface
• Communication interface level: 1.8/3.3v optional
• Peak wavelength of red LED: 650nm-670nm
• Peak wavelength of infrared LED: 870nm-900nm

Interface description:

• VIN: power inlet, 1.8v-5v
• SCL: clock of 12C bus
• SDA: 12C bus data
• INT: interrupt pin
• RD: output 2.8v, drive infrared LED
• RD: output 2.6v, drive red LED
• GND: grounding.

Principle of Working:
There are three traditional methods of pulse measurement: one is the extraction of ECG signals; Second, the pulse rate is calculated from the fluctuation measured by the pressure sensor during the measurement of blood pressure. Third, the light volume method. The first two methods of extracting signals restrict the patient’s movement, and if used for a long time, it will increase the patient’s physical and psychological discomfort. As one of the most common measurement methods in monitoring measurement, the optical volume pulse measurement has the characteristics of simple method, convenient to wear and high reliability.
The basic principle of light volume method is to measure pulse and blood oxygen saturation by using different light transmittance caused by vascular pulsation of human tissues. Secure to client’s finger, wrist, or earlobe by bandage or clip. When measuring blood oxygen saturation, according to the oxygen hemoglobin (Hb02) and hemoglobin (Hb) to infrared light, infrared light absorption to calculate. Blood vessels dilate and contract with the heartbeat, when diastolic blood volume, absorption of red and infrared light more, when systolic, blood volume less, absorption of red and infrared light less. Heart rates can be calculated based on periodic changes in the amount of light reflected to the sensor. Formula for calculating blood oxygen saturation.

Directions for use:
1) The module’s 12C communication interface is compatible with 1.8v /5V and can communicate with most conventional development boards.
2) The 1.8v /5V level can be selected by the solder joint on the module. As shown in the figure below, the middle of the solder joint is the common point and the two sides are the selected level connection points. The product is connected to 3.3v by default.

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