ad8232 모듈을 이용하여 bpm만을 측정하는 프로그램은 완성을 했습니다.
하지만 블루투스를 이용하여 bpm값을 측정한 값을 이용하여 led를 밝히는 프로그램을 만들고 있습니다.
블루투스를 이용하여 bpm이 측정이 되지 않아 led에도 불빛이 들어오지 않고있습니다.
제발 도와주세요ㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠㅠ
 
 
 
#include <SoftwareSerial.h>
#define btRX 8
#define btTX 9
SoftwareSerial Bluetooth(btRX, btTX);
String myString=" ";
int greenPin=2;
int yellowPin=5;
int redPin=4; 
#define pulsePin A0
//  VARIABLES
int rate[10];
unsigned long sampleCounter = 0;
unsigned long lastBeatTime = 0;
unsigned long lastTime = 0, N;
int BPM = 0;
int IBI = 0;
int P = 512;
int T = 512;
int thresh = 512;  
int amp = 100;                   
int Signal;
boolean Pulse = false;
boolean firstBeat = false;          
boolean secondBeat = false;
boolean QS = false;    
void setup() {
  Serial.begin(9600);
  Bluetooth.begin(9600);
  pinMode(greenPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(redPin, OUTPUT);
pinMode(10, INPUT); // Setup for leads off detection LO +
pinMode(11, INPUT); // Setup for leads off detection LO -
pinMode(pulsePin, INPUT);
}
void loop() {
  
  serialOutput();
  if (QS == true) {
             Serial.println("BPM: "+ String(BPM));
             QS = false;
        }
        else if (millis() >= (lastTime + 2)) {
            readPulse(); 
            lastTime = millis();
        }
}

void serialOutput(){
  while(Bluetooth.available()) {
    char myChar=(char)Bluetooth.read();
    myString+=myChar;
    Serial.print(myChar);
    delay(5);
  }
  if(!myString.equals(""))
  {
      if(myString=="on")
      {
        Serial.println(BPM);
        if(BPM<60||BPM>100){
        if(BPM<60){
         digitalWrite(yellowPin,HIGH);
         delay(3000);
         digitalWrite(yellowPin,LOW);
         delay(1000);
        }
        if(BPM>100){
         digitalWrite(redPin,HIGH);
         delay(3000);
         digitalWrite(redPin,LOW);
         delay(1000);
         }
        }
        else{
         digitalWrite(greenPin,HIGH);
         delay(3000); 
         digitalWrite(greenPin,LOW);
         delay(1000);
         }
       }
  }
  else
  {
    
    }
  myString="";
}

void readPulse() {
  Signal = analogRead(pulsePin);              
  sampleCounter += 2;                           
  int N = sampleCounter - lastBeatTime;   
  detectSetHighLow();
  if (N > 250) {  
    if ( (Signal > thresh) && (Pulse == false) && (N > (IBI / 5) * 3) )
      pulseDetected();
  }
  if (Signal < thresh && Pulse == true) {  
    Pulse = false;
    amp = P - T;
    thresh = amp / 2 + T;  
    P = thresh;
    T = thresh;
  }
  if (N > 2500) {
    thresh = 512;
    P = 512;
    T = 512;
    lastBeatTime = sampleCounter;
    firstBeat = true;            
    secondBeat = true;           
  }
}

void detectSetHighLow() {
  if (Signal < thresh && N > (IBI / 5) * 3) {
    if (Signal < T) {                       
      T = Signal;                         
    }
  }
  if (Signal > thresh && Signal > P) {    
    P = Signal;                           
  }                                       
}
void pulseDetected() {
  Pulse = true;                           
  IBI = sampleCounter - lastBeatTime;     
  lastBeatTime = sampleCounter;           
  if (firstBeat) {                       
    firstBeat = false;                 
    return;                            
  }
  if (secondBeat) {                    
    secondBeat = false;                
    for (int i = 0; i <= 9; i++) {   
      rate[i] = IBI;
    }
  }
  word runningTotal = 0;                   
  for (int i = 0; i <= 8; i++) {          
    rate[i] = rate[i + 1];            
    runningTotal += rate[i];          
  }
  rate[9] = IBI;                      
  runningTotal += rate[9];            
  runningTotal /= 10;                 
  BPM = 60000 / runningTotal;         
  QS = true;
}