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max30102相关问题

2019-07-15 07:54发布

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最近网上买了个max30102的心率血氧模块，用卖家给的单个例程的时候数据还算准确，但是我自己把心率和血氧功能整合到了一起，过来的数据就波动比较大了，想请大神们看看，如何修改。
程序如下：#include <Wire.h>#include "MAX30105.h"
#include "heartRate.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 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


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;


void setup()
{
  Serial.begin(115200); // initialize serial communication at 115200 bits per second:


  pinMode(pulseLED, OUTPUT);
  pinMode(readLED, OUTPUT);


  // 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


// 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
}


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 = particleSensor.getRed();
    irBuffer = 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;
      irBuffer[i - 25] = irBuffer;
    }


    //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 = particleSensor.getRed();
      irBuffer = particleSensor.getIR();
   
      
      long irValue = particleSensor.getIR();
      if (checkForBeat(irValue) == true)
  {
    //We sensed a beat!
    long delta = millis() - lastBeat;
    lastBeat = millis();
    beatsPerMinute = 60 / (delta / 1000.0);
  }


   
      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, DEC);
//     Serial.print(F(", ir="));
//     Serial.print(irBuffer, DEC);


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


//     Serial.print(F(", HRvalid="));
//     Serial.print(validHeartRate, DEC);

        Serial.print(", BPM=");
        Serial.print(beatsPerMinute);
   
      Serial.print(F(", SPO2="));
      Serial.print(spo2, DEC);


      Serial.print(F(", SPO2Valid="));
      Serial.println(validSPO2, DEC);


      


//    if (irValue < 50000)
//    Serial.println(" No finger?");
    }


    //After gathering 25 new samples recalculate HR and SP02
    maxim_heart_rate_and_oxygen_saturation(irBuffer, bufferLength, redBuffer, &spo2, &validSPO2, &heartRate, &validHeartRate);
  }
}




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传感器实物图 传感器实物图
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