Home Assistant Smart Home (MAX30102 Heart Rate/Oxygen Detection)

Introduction:The MAX30102, as a highly integrated and high-performance sensor, can accurately measure human heart rate and blood oxygen saturation, widely used in wearable devices, medical monitoring instruments, and other products. (For entertainment purposes only, it’s still best to go to the hospital for reliable results.)Wiring:

#include <Wire.h>#include "MAX30105.h"#include "spo2_algorithm.h"
MAX30105 particleSensor;
#define MAX_BRIGHTNESS 255
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)//Arduino Uno doesn't have enough SRAM to store 100 samples of IR led data and red led data in 32-bit format//To solve this problem, 16-bit MSB of the sampled data will be truncated. Samples become 16-bit data.uint16_t irBuffer[100]; //infrared LED sensor datauint16_t redBuffer[100];  //red LED sensor data#elseuint32_t irBuffer[100]; //infrared LED sensor datauint32_t redBuffer[100];  //red LED sensor data#endif
int32_t bufferLength; //data lengthint32_t spo2; //SPO2 valueint8_t validSPO2; //indicator to show if the SPO2 calculation is validint32_t heartRate; //heart rate valueint8_t validHeartRate; //indicator to show if the heart rate calculation is valid
byte pulseLED = 11; //Must be on PWM pinbyte readLED = 10; //Blinks with each data read
void setup(){  Serial.begin(115200); // initialize serial communication at 115200 bits per second:
  pinMode(pulseLED, OUTPUT);  pinMode(readLED, OUTPUT); Wire.begin(6, 7);  // SDA, SCL，所有范例需要添加此句，ESP32C6模块不然无法工作  // Initialize sensor  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed  {    Serial.println(F("MAX30105 was not found. Please check wiring/power."));    while (1);  }
  Serial.println(F("Attach sensor to finger with rubber band. Press any key to start conversion"));  while (Serial.available() == 0) ; //wait until user presses a key  Serial.read();  
  byte ledBrightness = 60; //Options: 0=Off to 255=50mA  byte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32  byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green  byte sampleRate = 100; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200  int pulseWidth = 411; //Options: 69, 118, 215, 411  int adcRange = 4096; //Options: 2048, 4096, 8192, 16384
  particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); //Configure sensor with these settings}
void loop(){  bufferLength = 100; //buffer length of 100 stores 4 seconds of samples running at 25sps
  //read the first 100 samples, and determine the signal range  for (byte i = 0 ; i < bufferLength ; i++)  {    while (particleSensor.available() == false) //do we have new data?      particleSensor.check(); //Check the sensor for new data
    redBuffer[i] = particleSensor.getRed();    irBuffer[i] = particleSensor.getIR();    particleSensor.nextSample(); //We're finished with this sample so move to next sample
    Serial.print(F("red="));    Serial.print(redBuffer[i], DEC);    Serial.print(F(", ir="));    Serial.println(irBuffer[i], DEC);  }
  //calculate heart rate and SpO2 after first 100 samples (first 4 seconds of samples)  maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate);
  //Continuously taking samples from MAX30102.  Heart rate and SpO2 are calculated every 1 second  while (1)  {    //dumping the first 25 sets of samples in the memory and shift the last 75 sets of samples to the top    for (byte i = 25; i < 100; i++)    {      redBuffer[i - 25] = redBuffer[i];      irBuffer[i - 25] = irBuffer[i];    }
    //take 25 sets of samples before calculating the heart rate.    for (byte i = 75; i < 100; i++)    {      while (particleSensor.available() == false) //do we have new data?        particleSensor.check(); //Check the sensor for new data
      digitalWrite(readLED, !digitalRead(readLED)); //Blink onboard LED with every data read
      redBuffer[i] = particleSensor.getRed();      irBuffer[i] = particleSensor.getIR();      particleSensor.nextSample(); //We're finished with this sample so move to next sample
      //send samples and calculation result to terminal program through UART      Serial.print(F("red="));      Serial.print(redBuffer[i], DEC);      Serial.print(F(", ir="));      Serial.print(irBuffer[i], DEC);
      Serial.print(F(", HR="));      Serial.print(heartRate, DEC);
      Serial.print(F(", HRvalid="));      Serial.print(validHeartRate, DEC);
      Serial.print(F(", SPO2="));      Serial.print(spo2, DEC);
      Serial.print(F(", SPO2Valid="));      Serial.println(validSPO2, DEC);    }
    //After gathering 25 new samples recalculate HR and SP02    maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate);  }}