使用ESP32和MAX30102模块计算心率变异性的Arduino IDE代码

以下是使用ESP32和MAX30102模块计算心率变异性的Arduino IDE代码：

#include <Wire.h>
#include "MAX30105.h"
#include "heartRate.h"

#define MAX30102_ADDRESS 0x57

MAX30105 particleSensor;

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);
  Wire.begin();
  particleSensor.setup(Wire, MAX30102_ADDRESS, 400); //Configure sensor with I2C address and operating speed
  particleSensor.setPulseAmplitudeRed(0x0A); //Turn Red LED to low to indicate sensor is running
  particleSensor.setPulseAmplitudeGreen(0); //Turn off Green LED
}

void loop()
{
  long irValue = particleSensor.getIR(); //Reading IR value
  if (checkForBeat(irValue) == true)
  {
    long delta = millis() - lastBeat;
    lastBeat = millis();

    beatsPerMinute = 60 / (delta / 1000.0);
    if (beatsPerMinute < 255 && beatsPerMinute > 20)
    {
      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;
    }
  }
  Serial.println(beatAvg);
}

该代码使用了 MAX30105 库和 heartRate 库。MAX30105 库负责驱动 MAX30102 模块读取红外线信号，而 heartRate 库负责检测心跳并计算心率变异性。最终，在串口监视器中输出心率变异性的平均值。