#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "MAX30105.h"
#include "heartRate.h"
 
// กำหนดที่อยู่ของจอ LCD I2C
LiquidCrystal_I2C lcd(0x27, 16, 2);
 
// กำหนดตัวแปรของ MAX30105
MAX30105 particleSensor;
const byte RATE_SIZE = 4;
byte rates[RATE_SIZE];
byte rateSpot = 0;
long lastBeat = 0;
 
float beatsPerMinute;
int beatAvg;
 
void setup()
{
    Serial.begin(115200);
    lcd.begin();
    lcd.backlight();
 
    lcd.setCursor(0, 0);
    lcd.print("Initializing...");
 
    // เริ่มต้นเซ็นเซอร์ MAX30105
    if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) {
        Serial.println("MAX30105 not found");
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Sensor Error");
        while (1);
    }
 
    particleSensor.setup();
    particleSensor.setPulseAmplitudeRed(0x0A);
    particleSensor.setPulseAmplitudeGreen(0);
 
    delay(2000); // รอให้เซ็นเซอร์เริ่มทำงาน
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Place finger");
}
 
void loop()
{
    long irValue = particleSensor.getIR();
 
    if (checkForBeat(irValue) == true)
    {
        long delta = millis() - lastBeat;
        lastBeat = millis();
 
        beatsPerMinute = 60 / (delta / 1000.0);
 
        if (beatsPerMinute < 255 && beatsPerMinute > 20)
        {
            rates[rateSpot++] = (byte)beatsPerMinute;
            rateSpot %= RATE_SIZE;
 
            beatAvg = 0;
            for (byte x = 0; x < RATE_SIZE; x++) {
                beatAvg += rates[x];
            }
            beatAvg /= RATE_SIZE;
        }
    }
 
    // แสดงค่าบน Serial Monitor
    Serial.print("IR=");
    Serial.print(irValue);
    Serial.print(", BPM=");
    Serial.print(beatsPerMinute);
    Serial.print(", Avg BPM=");
    Serial.print(beatAvg);
    if (irValue < 50000) Serial.print(" No finger?");
    Serial.println();
 
    // แสดงค่าบน LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("BPM: ");
    lcd.print(beatsPerMinute);
    lcd.setCursor(0, 1);
    lcd.print("Avg BPM: ");
    lcd.print(beatAvg);
 
    delay(1000);
}
 

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