Unit Heart Arduino Arduino Tutorial

#include "M5Unified.h"
#include "MAX30100.h"

#define SAMPLING_RATE   MAX30100_SAMPRATE_100HZ
#define IR_LED_CURRENT  MAX30100_LED_CURR_24MA
#define RED_LED_CURRENT MAX30100_LED_CURR_27_1MA
#define PULSE_WIDTH     MAX30100_SPC_PW_1600US_16BITS
#define HIGHRES_MODE    true

MAX30100 sensor;  // Instantiate a MAX30100 sensor class

void setup()
{
    M5.begin();        
    M5.Power.begin();  // Init power
    Serial.print("Initializing MAX30100..");

    while (!sensor.begin()) {  // Initialize the sensor
        M5.Lcd.setCursor(50, 100);
        M5.Lcd.println("Sensor not found");
        delay(1000);
    }
    M5.Lcd.setRotation(3);
    M5.Lcd.fillScreen(BLACK);
    M5.Lcd.setFont(&fonts::FreeMonoBold12pt7b);
    M5.Lcd.setTextSize(1.5);
    // Set up the wanted parameters
    sensor.setMode(MAX30100_MODE_SPO2_HR);
    sensor.setLedsCurrent(IR_LED_CURRENT, RED_LED_CURRENT);
    sensor.setLedsPulseWidth(PULSE_WIDTH);
    sensor.setSamplingRate(SAMPLING_RATE);
    sensor.setHighresModeEnabled(HIGHRES_MODE);
}

void loop()
{
    uint16_t ir, red;
    sensor.update();                       // Update sensor data
    if (sensor.getRawValues(&ir, &red)) {  // if get data
        M5.Lcd.setCursor(5, 20);
        M5.Lcd.printf("IR: %d", ir);
        M5.Lcd.setCursor(5, 70);
        M5.Lcd.printf("RED: %d", red);
    }
    delay(100); // Appropriate delay
    M5.Lcd.fillScreen(BLACK);
}