MAX30102 Pulse Oximeter Heart Rate Sensor Module

MAX30102 Pulse Oximeter Heart Rate Sensor Module Documentation

Overview

The MAX30102 is a pulse oximeter and heart rate sensor module that integrates a photoplethysmography (PPG) sensor and a low-noise analog-to-digital converter (ADC) to measure heart rate and oxygen saturation (SpO2) levels. This module is commonly used in wearable devices, medical equipment, and IoT projects.

Pinout

The MAX30102 module has the following pinout:

VCC: Power supply (3.3V or 5V)
 GND: Ground
 SCL: I2C clock
 SDA: I2C data
 INT: Interrupt output

Communication Protocol

The MAX30102 communicates through the I2C protocol.

Configuration and Initialization

Before using the MAX30102, it is necessary to configure and initialize the module. This involves setting the mode, sample rate, and LED currents.

Code Examples

### Example 1: Arduino Sketch for Heart Rate Monitoring

This example demonstrates how to use the MAX30102 to measure heart rate and display it on the serial monitor using an Arduino board.
```c
#include <Wire.h>

#define MAX30102_ADDRESS 0x57

void setup() {
  Serial.begin(9600);
  Wire.begin();
  
  // Initialize MAX30102
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x00); // Mode register
  Wire.write(0x03); // Enable heart rate mode
  Wire.endTransmission();
  
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x04); // Sample rate register
  Wire.write(0x01); // Set sample rate to 100 Hz
  Wire.endTransmission();
}

void loop() {
  int heartRate;
  
  // Read heart rate data
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x05); // Heart rate register
  Wire.endTransmission();
  Wire.requestFrom(MAX30102_ADDRESS, 2);
  heartRate = Wire.read() << 8 | Wire.read();
  
  Serial.print("Heart Rate: ");
  Serial.print(heartRate);
  Serial.println(" bpm");
  
  delay(1000);
}
```
### Example 2: Raspberry Pi Python Script for SpO2 Measurement

This example demonstrates how to use the MAX30102 to measure SpO2 levels and display them on the console using a Raspberry Pi.
```python
import smbus
import time

# Initialize I2C bus
bus = smbus.SMBus(1)

# MAX30102 address
address = 0x57

# Initialize MAX30102
bus.write_byte_data(address, 0x00, 0x03)  # Enable SpO2 mode
bus.write_byte_data(address, 0x04, 0x01)  # Set sample rate to 100 Hz

while True:
    # Read SpO2 data
    bus.write_byte(address, 0x06)  # SpO2 register
    data = bus.read_i2c_block_data(address, 0x06, 2)
    Spo2 = (data[0] << 8 | data[1]) & 0x03FF
    
    print("SpO2: {:.2f}%".format(Spo2 / 100.0))
    
    time.sleep(1)
```
### Example 3: ESP32 Code for Real-Time Heart Rate and SpO2 Monitoring

This example demonstrates how to use the MAX30102 to measure heart rate and SpO2 levels in real-time using an ESP32 board.
```c
#include <WiFi.h>
#include <Wire.h>

#define MAX30102_ADDRESS 0x57

void setup() {
  Serial.begin(115200);
  Wire.begin();
  
  // Initialize MAX30102
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x00); // Mode register
  Wire.write(0x03); // Enable heart rate and SpO2 mode
  Wire.endTransmission();
  
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x04); // Sample rate register
  Wire.write(0x01); // Set sample rate to 100 Hz
  Wire.endTransmission();
}

void loop() {
  int heartRate;
  int SpO2;
  
  // Read heart rate data
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x05); // Heart rate register
  Wire.endTransmission();
  Wire.requestFrom(MAX30102_ADDRESS, 2);
  heartRate = Wire.read() << 8 | Wire.read();
  
  // Read SpO2 data
  Wire.beginTransmission(MAX30102_ADDRESS);
  Wire.write(0x06); // SpO2 register
  Wire.endTransmission();
  Wire.requestFrom(MAX30102_ADDRESS, 2);
  SpO2 = Wire.read() << 8 | Wire.read();
  
  Serial.print("Heart Rate: ");
  Serial.print(heartRate);
  Serial.print(" bpm, SpO2: ");
  Serial.print(SpO2);
  Serial.println(" %");
  
  delay(1000);
}
```
Note: These examples are for illustrative purposes only and may require modifications to work with your specific hardware setup. Ensure you consult the MAX30102 datasheet and relevant documentation for your microcontroller or development board for more information on using this module.