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Max30102 didn't give me the result I expected, does the problem with the code? #4

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mamico131 opened this issue Sep 26, 2021 · 4 comments
Open

Max30102 didn't give me the result I expected, does the problem with the code? #4

mamico131 opened this issue Sep 26, 2021 · 4 comments

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@mamico131
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mamico131 commented Sep 26, 2021 •
edited
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Hi there,
I'm try max30102 with nodemcu everything is alright, except the readings I get are changing with a huge different it sometimes give a negative No. (-999) when SpO2 isn't valid, there is no other negative No. other than this, but I don't like that. I want it to give readings when its valid and waiting when it's not valid.

this is the code used:

`
// Include section
#include <Wire.h>
#include "MAX30105.h"
#include "spo2_algorithm.h"
#include "heartRate.h"

// Definitions
#define MAX_BRIGHTNESS 255

// Variables declaration
#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)

uint16_t irBuffer[100]; //infrared LED sensor data
uint16_t redBuffer[100];  //red LED sensor data
#else
uint32_t irBuffer[100]; //infrared LED sensor data
uint32_t redBuffer[100];  //red LED sensor data
#endif

int32_t bufferLength; //data length
int32_t spo2; //SPO2 value
int8_t validSPO2; //indicator to show if the SPO2 calculation is valid
int32_t heartRate; //heart rate value
int8_t validHeartRate; //indicator to show if the heart rate calculation is valid

byte pulseLED = 11; //Must be on PWM pin
byte readLED = 13; //Blinks with each data read

// Heart rate vars

const byte RATE_SIZE = 4; //Increase this for more averaging. 4 is good.
byte rates[RATE_SIZE]; //Array of heart rates
byte rateSpot = 0;
long lastBeat = 0; //Time at which the last beat occurred

float beatsPerMinute;
int beatAvg;

// sampling times

unsigned long prevHRTime;
unsigned long prevSP02Time;

// Sensor object instantiation
MAX30105 particleSensor;

// Setup
void setup(){

// Initialize serial port and configure your sensor 

  Serial.begin(115200);
 Serial.println("Initializing...");

  // Initialize sensor
  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) 
  {
    Serial.println("MAX30105 was not found. Please check wiring/power. ");
    while (1);
  }
  Serial.println("Place your index finger on the sensor with steady pressure.");

  particleSensor.setup(); //Configure sensor with default settings
  particleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running
  particleSensor.setPulseAmplitudeGreen(0); //Turn off Green LED

  prevHRTime = millis();
  prevSP02Time = millis();
}


// main loop

void loop(){

    unsigned long now = millis();

//    if(now - prevHRTime > 50){
//        prevHRTime  = now;
//
        heart_rate();    // Implementation is below
//
//    }
  
}



void heart_rate(){

 long irValue = particleSensor.getIR();

  if (checkForBeat(irValue) == true)
  {
    //We sensed a beat!
    long delta = millis() - lastBeat;
    lastBeat = millis();

    beatsPerMinute = 60 / (delta / 1000.0);
    Serial.print("true");

    // ------------------------------------------------------

      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

  }

  //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(", HR=");
      Serial.print(heartRate, DEC);
      
      Serial.print(", SPO2=");
      Serial.print(spo2, DEC);

      Serial.print(", 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);
  }

    //--------------------------------------------------------


  Serial.print("IR=");
  Serial.print(irValue);
  Serial.print(", BPM=");
  Serial.print(beatsPerMinute);
//  Serial.println();
  }



  if (irValue < 50000)
  {
    beatsPerMinute = 0;
    beatAvg = 0;
    Serial.print(" No finger?");
    Serial.println();
  }


}

,

this is the result I got:

,
 No finger?
true, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=88, SPO2=-999, SPO2Valid=0
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=53, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=62, SPO2=14, SPO2Valid=1
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=-999, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=107, SPO2=-999, SPO2Valid=0
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=214, SPO2=63, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=136, SPO2=84, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=72, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=250, SPO2=48, SPO2Valid=1
, HR=214, SPO2=61, SPO2Valid=1
,
@KarimAhmed-dotcom
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I'm facing the same problem

@yaelgl
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yaelgl commented Oct 5, 2023

same problem lol

@yaelgl
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yaelgl commented Oct 5, 2023

i add a if to get only de valid spo2

@Uuka123
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Uuka123 commented Feb 1, 2024

I'm getting the same problem, does anyone now how to fix?

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@KarimAhmed-dotcom @mamico131 @yaelgl @Uuka123