#include <SoftwareSerial.h>
#define BT_RXD 8
#define BT_TXD 7
SoftwareSerial bluetooth(BT_RXD,BT_TXD);
SoftwareSerial gps(11,12); //tx,rx를 각각의 핀에 연결
//
#include <OneWire.h>
int DS18S20_Pin=2; //온도센서를 2번 핀으로 연결
OneWire ds(DS18S20_Pin); //2번 핀과 연결되 OneWire 객체 생성
//
int red=11; //빨간색led를 11번 핀으로 연결
int blue=10; //파란색led를 10번 핀으로 연결
//
void setup(){
  pinMode(red,OUTPUT); pinMode(blue,OUTPUT);
  Serial.begin(9600);
  bluetooth.begin(9600);
  gps.begin(9600);
}
//
void loop(){
  if(gps.available()){ Serial.write(gps.read()); }
  //
  if(bluetooth.available()){ Serial.write(bluetooth.read()); }
  if(Serial.available()){ bluetooth.write(Serial.read()); }
  //
  float temperature=getTemp(); //온도 측정 후 변수에 저장
  Serial.println(temperature);
  if(temperature<24){ digitalWrite(red,LOW); digitalWrite(blue,HIGH); delay(100); } //온도가 24도 이하일 때,파란색 LED 점등
  else{ digitalWrite(red,HIGH); digitalWrite(blue,LOW); delay(100); } //온도가 24도 이상일 때,빨간색 LED 점등
}
//
float getTemp(){ //온도 측정 후 반환하는 함수
  byte data[12];
  byte addr[8];
  if(!ds.search(addr)){ ds.reset_search(); return-1000; }
  if(OneWire:: crc8(addr,7)!=addr[7]){ Serial.println("CRC is not valid!"); return-1000; }
  if(addr[0]!=0x10&&addr[0]!=0x28){ Serial.print("Device is not recognized"); return-1000; }
  ds.reset();
  ds.select(addr);
  ds.write(0x44,1);
  byte present=ds.reset();
  ds.select(addr);
  ds.write(0xBE);
  for(int i=0; i<9; i++){ data[i]=ds.read(); }
  ds.reset_search();
  byte MSB=data[1]; byte LSB=data[0];
  float tempRead=((MSB<<8)|LSB);
  float TemperatureSum=tempRead/16;
  return TemperatureSum;
} 
 
 
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위 소스에다가 심장박동 모니터링 소스를 추가하고싶은데 밑에 소스는 있는데 합치는 방법을 잘 모르겠습니다.
 
 
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#define USE_ARDUINO_INTERRUPTS true    // Set-up low-level interrupts for most acurate BPM math.
#include <PulseSensorPlayground.h>     // Includes the PulseSensorPlayground Library.   
//  Variables
const int PulseWire = 0;       // PulseSensor PURPLE WIRE connected to ANALOG PIN 0
const int LED13 = 13;          // The on-board Arduino LED, close to PIN 13.
int Threshold = 550;           // Determine which Signal to "count as a beat" and which to ignore.
                               // Use the "Gettting Started Project" to fine-tune Threshold Value beyond default setting.
                               // Otherwise leave the default "550" value. 
                               
PulseSensorPlayground pulseSensor;  // Creates an instance of the PulseSensorPlayground object called "pulseSensor"

void setup() {   
  Serial.begin(9600);          // For Serial Monitor
  // Configure the PulseSensor object, by assigning our variables to it. 
  pulseSensor.analogInput(PulseWire);   
  pulseSensor.blinkOnPulse(LED13);       //auto-magically blink Arduino's LED with heartbeat.
  pulseSensor.setThreshold(Threshold);   
  // Double-check the "pulseSensor" object was created and "began" seeing a signal. 
   if (pulseSensor.begin()) {
    Serial.println("We created a pulseSensor Object !");  //This prints one time at Arduino power-up,  or on Arduino reset.  
  }
}
 
void loop() {
 int myBPM = pulseSensor.getBeatsPerMinute();  // Calls function on our pulseSensor object that returns BPM as an "int".
                                               // "myBPM" hold this BPM value now. 
if (pulseSensor.sawStartOfBeat()) {            // Constantly test to see if "a beat happened". 
 // If test is "true", print a message "a heartbeat happened".
 Serial.print("BPM: ");                        // Print phrase "BPM: " 
 Serial.println(myBPM);                        // Print the value inside of myBPM. 
}
  delay(200);                    // considered best practice in a simple sketch.
}