max_operator.ino.ino

#include <Wire.h>
#include "MAX30105.h"
#include "heartRate.h"
#include "spo2_algorithm.h"

MAX30105 particleSensor;

const byte AVG_SAMPLES = 4; // Number of samples for averaging
float bpmSamples[AVG_SAMPLES];
int spo2Samples[AVG_SAMPLES];
byte sampleIndex = 0;
bool bufferFull = false;

long lastBeat = 0;
float beatsPerMinute;

void setup() {
  Serial.begin(115200);
  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) {
    Serial.println("MAX30102 was not found. Please check wiring/power.");
    while (1);
  }

  // Setup sensor with recommended SpO2 and BPM settings
  particleSensor.setup(); 
  particleSensor.setPulseAmplitudeRed(0x0A); // Low amplitude for detection
  particleSensor.setPulseAmplitudeGreen(0);
  
  Serial.println("Place your finger on the sensor...");
}

void loop() {
  long irValue = particleSensor.getIR();

  // If a finger is detected (IR value > 50,000)
  if (irValue > 50000) {
    if (checkForBeat(irValue) == true) {
      long delta = millis() - lastBeat;
      lastBeat = millis();
      beatsPerMinute = 60 / (delta / 1000.0);

      // Basic filtering: only record realistic human heart rates
      if (beatsPerMinute < 255 && beatsPerMinute > 20) {
        bpmSamples[sampleIndex] = beatsPerMinute;
        
        // Simulating SpO2 for simplified code; use spo2_algorithm.h for full accuracy
        // Note: Real SpO2 requires the red and IR buffers (approx 4s of data)
        spo2Samples[sampleIndex] = 98; // Placeholder: replace with algorithm result

        sampleIndex++;
        if (sampleIndex >= AVG_SAMPLES) {
          sampleIndex = 0;
          bufferFull = true;
        }

        // Calculate and display averages after 20 samples
        if (bufferFull) {
          float avgBPM = 0;
          float avgSPO2 = 0;
          for (int i = 0; i < AVG_SAMPLES; i++) {
            avgBPM += bpmSamples[i];
            avgSPO2 += spo2Samples[i];
          }
          avgBPM /= AVG_SAMPLES;
          avgSPO2 /= AVG_SAMPLES;

          Serial.print("--- AVG (20 Samples) --- ");
          Serial.print("BPM: "); Serial.print(avgBPM);
          Serial.print(" | SpO2: "); Serial.print(avgSPO2);
          Serial.println("%");
        }
      }
    }
  } else {
    // Reset buffer if finger is removed
    sampleIndex = 0;
    bufferFull = false;
    Serial.println("No finger detected.");
    delay(500);
  }
}