arduino esp32 MAX30102

Arduino ESP32和MAX30102传感器可以一起使用，用于监测心率和血氧水平。以下是使用Arduino IDE编写的简单代码示例：

1. 首先，需要安装MAX30102库。在Arduino IDE中点击“工具”>“管理库”，然后搜索“MAX30102”并安装“MAX30105 Particle and MAX30102 Heart-Rate Sensor Library”。

2. 然后，将MAX30102传感器连接到Arduino ESP32。连接如下：

- VCC连接到ESP32的3.3V引脚
- GND连接到ESP32的GND引脚
- SCL连接到ESP32的SCL引脚
- SDA连接到ESP32的SDA引脚

3. 接下来，打开Arduino IDE并创建一个新的空白项目。将以下代码复制并粘贴到项目中：

   #include "MAX30105.h"
   #include "heartRate.h"
   
   MAX30105 particleSensor;
   byte rate[4];
   long hr;
   byte spo2;
   boolean began = false;
   
   void setup()
   {
     Serial.begin(115200);
     pinMode(13, OUTPUT);
     Serial.print("Initializing...");
   
     if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
     {
       Serial.println("MAX30105 was not found. Please check wiring/power. ");
       while (1);
     }
   
     Serial.println("MAX30105 found!");
   
     particleSensor.setup();
   
     particleSensor.setPulseAmplitudeRed(0x0A);
     particleSensor.setPulseAmplitudeGreen(0);
     particleSensor.setPulseAmplitudeIR(0);
   
     Serial.println("Place your index finger on the sensor with steady pressure.");
   
     began = true;
   }
   
   void loop()
   {
     if (began == true)
     {
       int32_t irValue = particleSensor.getIR();
       if (checkForBeat(irValue) == true)
       {
         digitalWrite(13, !digitalRead(13)); //Blink onboard LED with every heart beat
         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;
         }
       }
   
       if (millis() - tsLastReported > REPORTING_PERIOD_MS)
       {
         Serial.print("Heart rate:");
         Serial.print(beatAvg);
         Serial.print(" bpm ");
         Serial.print("Oxygen Saturation:");
         Serial.print(particleSensor.getSpO2());
         Serial.println("%");
         tsLastReported = millis();
       }
     }
   }

4. 上传代码到Arduino ESP32并打开串口监视器。将手指放在MAX30102传感器上，应该能够看到心率和血氧水平的实时读数。