Max30102 cannot measure heart rate and SpO2 at the same time

Using Arduino Sensors
1

I found this code on github and used it, however my Max30102 cannot measure SpO2 and Heart Rate at the same time, sometimes it cannot measure both. Can anyone help me find out if the error is due to the code or the device?

You can read full code in this link(youjunjer/ESP32-MAX30102 (github.com))

void loop() {
  long irValue = particleSensor.getIR();
  if (irValue > 7000 ) {
    float temperature = readTemperature();
    float avgBeat = calculateAvgHeartBeat(irValue);
    double spO2 = calculateSpO2();
  }

  // Handle no finger detected case
  else {
    for (byte rx = 0 ; rx < RATE_SIZE ; rx++) rates[rx] = 0;
    beatAvg = 0;
    avered = 0; aveir = 0; sumirrms = 0; sumredrms = 0; rateSpot = 0;
    SpO2 = 0; ESpO2 = 90.0; 
    }
  particleSensor.nextSample();
}


float calculateAvgHeartBeat(long irValue){
  if (checkForBeat(irValue) == true) {
      //Calculate beatsPerMinute
      long delta = millis() - lastBeat;
      lastBeat = millis();
      beatsPerMinute = 60 / (delta / 1000.0);

      if (beatsPerMinute < 255 && beatsPerMinute > 20) {  //Check if the BPM value is within a valid range
        rates[rateSpot++] = (byte)beatsPerMinute;         //Store this reading in the array
        rateSpot %= RATE_SIZE;                            //Wrap variable

        //Take average of readings
        beatAvg = 0;
        for (byte x = 0; x < RATE_SIZE; x++)
          beatAvg += rates[x];
        beatAvg /= RATE_SIZE;
      }
    }
    return beatAvg;
}

float readTemperature(){
  float temperature  = mlx.readObjectTempC() + 1.0; 
  return temperature ;
}

double calculateSpO2() {
  uint32_t ir, red ;
  double fred, fir;
  if (particleSensor.available()) {
    i++;
    ir = particleSensor.getFIFOIR(); 
    red = particleSensor.getFIFORed();

    fir = (double)ir;
    fred = (double)red;

    aveir = aveir * frate + (double)ir * (1.0 - frate); //average IR level by low pass filter
    avered = avered * frate + (double)red * (1.0 - frate);//average red level by low pass filter
    sumirrms += (fir - aveir) * (fir - aveir);//square sum of alternate component of IR level
    sumredrms += (fred - avered) * (fred - avered); 
    

    if (i % Num_Readings == 0) {
      double R = (sqrt(sumirrms) / aveir) / (sqrt(sumredrms) / avered);
      SpO2 = -23.3 * (R - 0.4) + 100;
      ESpO2 = FSpO2 * ESpO2 + (1.0 - FSpO2) * SpO2;
      if (ESpO2 <= MINIMUM_SPO2) ESpO2 = MINIMUM_SPO2;
      if (ESpO2 > 100) ESpO2 = 99.9;

      sumredrms = 0.0;
      sumirrms = 0.0;
      SpO2 = 0;
      i = 0;
    }
  }

  return ESpO2;
}
2

Your topic does not indicate a problem with the IDE itself and hence has been moved to a more suitable location on the forum.

3

MAX30102 cannot measure SpO2 while moving. Are you stationary when trying to take this measurement?

4

I always don't move when measuring.