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

// Create an instance of the MAX30105 object
MAX30105 particleSensor;

// Define I2C pins (SDA and SCL)
#define SDA_PIN 21
#define SCL_PIN 22

void setup() {
  // Start serial communication
  Serial.begin(115200);
  delay(1000);

  // Initialize I2C with the correct pins for ESP32
  Wire.begin(SDA_PIN, SCL_PIN);

  // Initialize the sensor
  if (!particleSensor.begin()) {
    Serial.println("Could not find a valid MAX30102 sensor!");
    while (1);
  }

  // Configure the sensor (default settings for heart rate and SpO2)
  particleSensor.setup();  // Default setup for heart rate and SpO2
  particleSensor.setPulseAmplitudeRed(0x0A);  // Set red LED brightness
  particleSensor.setPulseAmplitudeGreen(0x0A);  // Set green LED brightness
}

void loop() {
  long irValue = particleSensor.getIR(); // Read IR value (used for SpO2 and heart rate)

  // If the sensor detects a finger (IR value > 5000), try to calculate the heart rate and SpO2
  if (irValue > 5000) {
    // Read the heart rate and SpO2
    long heartRate = particleSensor.getHeartRate();
    long spo2 = particleSensor.getSpO2();

    // Print the readings to the serial monitor
    Serial.print("Heart Rate: ");
    Serial.print(heartRate);
    Serial.print(" bpm\t");
    Serial.print("SpO2: ");
    Serial.print(spo2);
    Serial.println(" %");
  } else {
    Serial.println("No finger detected.");
  }

  delay(1000);  // Wait for a second before reading again
}