user62240: #include <PulseSensorPlayground.h>

int pulsePin = A0;                 // Pulse Sensor purple wire connected to analog pin A0
int Redled = 7;  // The pin for the Red LED which notifies you if you're heart rate is increasing.
int Greenled = 8; // The pin for the Green LED which notifies you if you're heart rate is stable.
int buzzer = 9; // The pin for the piezo which plays music when you're heart rate is increasing.
int music[] = {261, 277, 294, 311, 330, 349, 370, 392, 415, 440};//The frequency the piezo will play.


// the follow variables are long's because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long time = 0;         // the last time the output pin was toggled
long debounce = 200;   // the debounce time, increase if the output flickers
//push button part stop

// Volatile Variables, used in the interrupt service routine!
volatile int BPM;                   // int that holds raw Analog in 0. updated every 2mS
volatile int Signal;                // holds the incoming raw data
volatile int IBI = 600;             // int that holds the time interval between beats! Must be seeded! 
volatile boolean Pulse = false;     // "True" when User's live heartbeat is detected. "False" when not a "live beat". 
volatile boolean QS = false;        // becomes true when Arduoino finds a beat.

static boolean serialVisual = true;   // Set to 'false' by Default.  Re-set to 'true' to see Arduino Serial Monitor ASCII Visual Pulse 

volatile int rate[10];                      // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0;          // used to determine pulse timing
volatile unsigned long lastBeatTime = 0;           // used to find IBI
volatile int P = 512;                      // used to find peak in pulse wave, seeded
volatile int T = 512;                     // used to find trough in pulse wave, seeded
volatile int thresh = 525;                // used to find instant moment of heart beat, seeded
volatile int amp = 100;                   // used to hold amplitude of pulse waveform, seeded
volatile boolean firstBeat = true;        // used to seed rate array so we startup with reasonable BPM
volatile boolean secondBeat = false;      // used to seed rate array so we startup with reasonable BPM

void setup()
{



 pinMode(Redled, OUTPUT); //This defines the pin to be an output
 pinMode(Greenled, OUTPUT);//This defines that the Green Led will be an output.
 pinMode(buzzer,OUTPUT);//This defines that the piezo pin will be an output.


  Serial.begin(115200);
  interruptSetup();                // sets up to read Pulse Sensor signal every 2mS                
                                    //   analogReference(EXTERNAL);   

}


//  Continuous and does not stop
void loop()
{



   serialOutput();  

  if (QS == true) // A Heartbeat Was Found
    {     
      // BPM and IBI have been Determined
      // Quantified Self "QS" true when arduino finds a heartbeat
      serialOutputWhenBeatHappens(); // A Beat Happened, Output that to serial.     
      QS = false; // reset the Quantified Self flag for next time    
    }
   if (BPM > 50){ //If the heart rate is more than 55 BPM(Beats Per Minute) then...

    digitalWrite(Redled, HIGH);//The Red Led will turn on
    digitalWrite(Greenled, LOW);//Green Led will turn off

   }
   else if(BPM < 50)//If the heart rate is below 55 BPM then...
   {
   digitalWrite(Redled, LOW);//The Red Led will stay off
   digitalWrite(Greenled, HIGH);//The Green Led will stay on
   tone(3, 500, 1000);

   }
  delay(20); //  take a breakx


  }

void interruptSetup()
{     
  // Initializes Timer2 to throw an interrupt every 2mS.
  TCCR2A = 0x02;     // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO CTC MODE
  TCCR2B = 0x06;     // DON'T FORCE COMPARE, 256 PRESCALER 
  OCR2A = 0X7C;      // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE RATE
  TIMSK2 = 0x02;     // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND OCR2A
  sei();             // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED      
} 

void serialOutput()
{   // Decide How To Output Serial. 
 if (serialVisual == true)
  {  
     arduinoSerialMonitorVisual('-', Signal);   // goes to function that makes Serial Monitor Visualizer
  } 
 else
  {
      sendDataToSerial('S', Signal);     // goes to sendDataToSerial function
   }        
}

void serialOutputWhenBeatHappens()
{    
 if (serialVisual == true) //  Code to Make the Serial Monitor Visualizer Work
   {            
     Serial.print(" Heart-Beat Found ");  //ASCII Art Madness
     Serial.print("BPM: ");
     Serial.println(BPM);

     delay(300);

   }
 else
   {
     sendDataToSerial('B',BPM);   // send heart rate with a 'B' prefix
     sendDataToSerial('Q',IBI);   // send time between beats with a 'Q' prefix
   }   
}

void arduinoSerialMonitorVisual(char symbol, int data )
{    
  const int sensorMin = 0;      // sensor minimum, discovered through experiment
  const int sensorMax = 100;    // sensor maximum, discovered through experiment
  int sensorReading = data; // map the sensor range to a range of 12 options:
  int range = map(sensorReading, sensorMin, sensorMax, 0, 11);
  // do something different depending on the 
  // range value:
}


void sendDataToSerial(char symbol, int data )
{
   Serial.print(symbol);
   Serial.println(data);                
}

ISR(TIMER2_COMPA_vect) //triggered when Timer2 counts to 124
{  
  cli();                                      // disable interrupts while we do this
  Signal = analogRead(pulsePin);              // read the Pulse Sensor 
  sampleCounter += 2;                         // keep track of the time in mS with this variable
  int N = sampleCounter - lastBeatTime;       // monitor the time since the last beat to avoid noise
                                              //  find the peak and trough of the pulse wave
  if(Signal < thresh && N > (IBI/5)*3) // avoid dichrotic noise by waiting 3/5 of last IBI
    {      
      if (Signal < T) // T is the trough
      {                        
        T = Signal; // keep track of lowest point in pulse wave 
      }
    }

  if(Signal > thresh && Signal > P)
    {          // thresh condition helps avoid noise
      P = Signal;                             // P is the peak
    }                                        // keep track of highest point in pulse wave

  //  NOW IT'S TIME TO LOOK FOR THE HEART BEAT
  // signal surges up in value every time there is a pulse
  if (N > 250)
  {                                   // avoid high frequency noise
    if ( (Signal > thresh) && (Pulse == false) && (N > (IBI/5)*3) )
      {        
        Pulse = true;                               // set the Pulse flag when we think there is a pulse

        IBI = sampleCounter - lastBeatTime;         // measure time between beats in mS
        lastBeatTime = sampleCounter;               // keep track of time for next pulse

        if(secondBeat)
        {                        // if this is the second beat, if secondBeat == TRUE
          secondBeat = false;                  // clear secondBeat flag
          for(int i=0; i<=9; i++) // seed the running total to get a realisitic BPM at startup
          {             
            rate[i] = IBI;                      
          }
        }

        if(firstBeat) // if it's the first time we found a beat, if firstBeat == TRUE
        {                         
          firstBeat = false;                   // clear firstBeat flag
          secondBeat = true;                   // set the second beat flag
          sei();                               // enable interrupts again
          return;                              // IBI value is unreliable so discard it
        }   
      // keep a running total of the last 10 IBI values
      word runningTotal = 0;                  // clear the runningTotal variable    

      for(int i=0; i<=8; i++)
        {                // shift data in the rate array
          rate[i] = rate[i+1];                  // and drop the oldest IBI value 
          runningTotal += rate[i];              // add up the 9 oldest IBI values
        }

      rate[9] = IBI;                          // add the latest IBI to the rate array
      runningTotal += rate[9];                // add the latest IBI to runningTotal
      runningTotal /= 10;                     // average the last 10 IBI values 
      BPM = 60000/runningTotal;               // how many beats can fit into a minute? that's BPM!
      QS = true;                              // set Quantified Self flag 
      // QS FLAG IS NOT CLEARED INSIDE THIS ISR
    }                       
  }

  if (Signal < thresh && Pulse == true)
    {   // when the values are going down, the beat is over
      Pulse = false;                         // reset the Pulse flag so we can do it again
      amp = P - T;                           // get amplitude of the pulse wave
      thresh = amp/2 + T;                    // set thresh at 50% of the amplitude
      P = thresh;                            // reset these for next time
      T = thresh;
    }

  if (N > 2500)
    {                           // if 2.5 seconds go by without a beat
      thresh = 512;                          // set thresh default
      P = 512;                               // set P default
      T = 512;                               // set T default
      lastBeatTime = sampleCounter;          // bring the lastBeatTime up to date        
      firstBeat = true;                      // set these to avoid noise
      secondBeat = false;                    // when we get the heartbeat back
    }

  sei();                                   // enable interrupts when youre done!
}// end isr

This is the error code I get
Arduino: 1.8.10 (Windows 10), Board: "Arduino Uno"

Tone.cpp.o (symbol from plugin): In function `timer0_pin_port':

(.text+0x0): multiple definition of `__vector_7'

sketch\Heart_Beat_Sensor_Code.ino.cpp.o (symbol from plugin):(.text+0x0): first defined here

collect2.exe: error: ld returned 1 exit status

Multiple libraries were found for "PulseSensorPlayground.h"
 Used: C:\Users\amaan\Documents\Arduino\libraries\PulseSensor_Playground
exit status 1
Error compiling for board Arduino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.


user4143: Both the tone() command and the PulseSensor_Playground library use Timer 0's interrupt.  That means there are two implementations of the ISR for that interrupt. However you can only have one implementation of a function or ISR, so it conflicts.
You will have to modify the PulseSensor_Playground library to use a different timer. There may be a way in the code already (some libraries implement such a thing) - if not then you'll have to rewrite the library to use another timer.

62240: <pre><code>#include &lt;PulseSensorPlayground.h&gt;

int pulsePin = A0;                 // Pulse Sensor purple wire connected to analog pin A0
int Redled = 7;  // The pin for the Red LED which notifies you if you're heart rate is increasing.
int Greenled = 8; // The pin for the Green LED which notifies you if you're heart rate is stable.
int buzzer = 9; // The pin for the piezo which plays music when you're heart rate is increasing.
int music[] = {261, 277, 294, 311, 330, 349, 370, 392, 415, 440};//The frequency the piezo will play.


// the follow variables are long's because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long time = 0;         // the last time the output pin was toggled
long debounce = 200;   // the debounce time, increase if the output flickers
//push button part stop

// Volatile Variables, used in the interrupt service routine!
volatile int BPM;                   // int that holds raw Analog in 0. updated every 2mS
volatile int Signal;                // holds the incoming raw data
volatile int IBI = 600;             // int that holds the time interval between beats! Must be seeded! 
volatile boolean Pulse = false;     // "True" when User's live heartbeat is detected. "False" when not a "live beat". 
volatile boolean QS = false;        // becomes true when Arduoino finds a beat.

static boolean serialVisual = true;   // Set to 'false' by Default.  Re-set to 'true' to see Arduino Serial Monitor ASCII Visual Pulse 

volatile int rate[10];                      // array to hold last ten IBI values
volatile unsigned long sampleCounter = 0;          // used to determine pulse timing
volatile unsigned long lastBeatTime = 0;           // used to find IBI
volatile int P = 512;                      // used to find peak in pulse wave, seeded
volatile int T = 512;                     // used to find trough in pulse wave, seeded
volatile int thresh = 525;                // used to find instant moment of heart beat, seeded
volatile int amp = 100;                   // used to hold amplitude of pulse waveform, seeded
volatile boolean firstBeat = true;        // used to seed rate array so we startup with reasonable BPM
volatile boolean secondBeat = false;      // used to seed rate array so we startup with reasonable BPM

void setup()
{



 pinMode(Redled, OUTPUT); //This defines the pin to be an output
 pinMode(Greenled, OUTPUT);//This defines that the Green Led will be an output.
 pinMode(buzzer,OUTPUT);//This defines that the piezo pin will be an output.


  Serial.begin(115200);
  interruptSetup();                // sets up to read Pulse Sensor signal every 2mS                
                                    //   analogReference(EXTERNAL);   

}


//  Continuous and does not stop
void loop()
{



   serialOutput();  

  if (QS == true) // A Heartbeat Was Found
    {     
      // BPM and IBI have been Determined
      // Quantified Self "QS" true when arduino finds a heartbeat
      serialOutputWhenBeatHappens(); // A Beat Happened, Output that to serial.     
      QS = false; // reset the Quantified Self flag for next time    
    }
   if (BPM &gt; 50){ //If the heart rate is more than 55 BPM(Beats Per Minute) then...

    digitalWrite(Redled, HIGH);//The Red Led will turn on
    digitalWrite(Greenled, LOW);//Green Led will turn off

   }
   else if(BPM &lt; 50)//If the heart rate is below 55 BPM then...
   {
   digitalWrite(Redled, LOW);//The Red Led will stay off
   digitalWrite(Greenled, HIGH);//The Green Led will stay on
   tone(3, 500, 1000);

   }
  delay(20); //  take a breakx


  }

void interruptSetup()
{     
  // Initializes Timer2 to throw an interrupt every 2mS.
  TCCR2A = 0x02;     // DISABLE PWM ON DIGITAL PINS 3 AND 11, AND GO INTO CTC MODE
  TCCR2B = 0x06;     // DON'T FORCE COMPARE, 256 PRESCALER 
  OCR2A = 0X7C;      // SET THE TOP OF THE COUNT TO 124 FOR 500Hz SAMPLE RATE
  TIMSK2 = 0x02;     // ENABLE INTERRUPT ON MATCH BETWEEN TIMER2 AND OCR2A
  sei();             // MAKE SURE GLOBAL INTERRUPTS ARE ENABLED      
} 

void serialOutput()
{   // Decide How To Output Serial. 
 if (serialVisual == true)
  {  
     arduinoSerialMonitorVisual('-', Signal);   // goes to function that makes Serial Monitor Visualizer
  } 
 else
  {
      sendDataToSerial('S', Signal);     // goes to sendDataToSerial function
   }        
}

void serialOutputWhenBeatHappens()
{    
 if (serialVisual == true) //  Code to Make the Serial Monitor Visualizer Work
   {            
     Serial.print(" Heart-Beat Found ");  //ASCII Art Madness
     Serial.print("BPM: ");
     Serial.println(BPM);

     delay(300);

   }
 else
   {
     sendDataToSerial('B',BPM);   // send heart rate with a 'B' prefix
     sendDataToSerial('Q',IBI);   // send time between beats with a 'Q' prefix
   }   
}

void arduinoSerialMonitorVisual(char symbol, int data )
{    
  const int sensorMin = 0;      // sensor minimum, discovered through experiment
  const int sensorMax = 100;    // sensor maximum, discovered through experiment
  int sensorReading = data; // map the sensor range to a range of 12 options:
  int range = map(sensorReading, sensorMin, sensorMax, 0, 11);
  // do something different depending on the 
  // range value:
}


void sendDataToSerial(char symbol, int data )
{
   Serial.print(symbol);
   Serial.println(data);                
}

ISR(TIMER2_COMPA_vect) //triggered when Timer2 counts to 124
{  
  cli();                                      // disable interrupts while we do this
  Signal = analogRead(pulsePin);              // read the Pulse Sensor 
  sampleCounter += 2;                         // keep track of the time in mS with this variable
  int N = sampleCounter - lastBeatTime;       // monitor the time since the last beat to avoid noise
                                              //  find the peak and trough of the pulse wave
  if(Signal &lt; thresh &amp;&amp; N &gt; (IBI/5)*3) // avoid dichrotic noise by waiting 3/5 of last IBI
    {      
      if (Signal &lt; T) // T is the trough
      {                        
        T = Signal; // keep track of lowest point in pulse wave 
      }
    }

  if(Signal &gt; thresh &amp;&amp; Signal &gt; P)
    {          // thresh condition helps avoid noise
      P = Signal;                             // P is the peak
    }                                        // keep track of highest point in pulse wave

  //  NOW IT'S TIME TO LOOK FOR THE HEART BEAT
  // signal surges up in value every time there is a pulse
  if (N &gt; 250)
  {                                   // avoid high frequency noise
    if ( (Signal &gt; thresh) &amp;&amp; (Pulse == false) &amp;&amp; (N &gt; (IBI/5)*3) )
      {        
        Pulse = true;                               // set the Pulse flag when we think there is a pulse

        IBI = sampleCounter - lastBeatTime;         // measure time between beats in mS
        lastBeatTime = sampleCounter;               // keep track of time for next pulse

        if(secondBeat)
        {                        // if this is the second beat, if secondBeat == TRUE
          secondBeat = false;                  // clear secondBeat flag
          for(int i=0; i&lt;=9; i++) // seed the running total to get a realisitic BPM at startup
          {             
            rate[i] = IBI;                      
          }
        }

        if(firstBeat) // if it's the first time we found a beat, if firstBeat == TRUE
        {                         
          firstBeat = false;                   // clear firstBeat flag
          secondBeat = true;                   // set the second beat flag
          sei();                               // enable interrupts again
          return;                              // IBI value is unreliable so discard it
        }   
      // keep a running total of the last 10 IBI values
      word runningTotal = 0;                  // clear the runningTotal variable    

      for(int i=0; i&lt;=8; i++)
        {                // shift data in the rate array
          rate[i] = rate[i+1];                  // and drop the oldest IBI value 
          runningTotal += rate[i];              // add up the 9 oldest IBI values
        }

      rate[9] = IBI;                          // add the latest IBI to the rate array
      runningTotal += rate[9];                // add the latest IBI to runningTotal
      runningTotal /= 10;                     // average the last 10 IBI values 
      BPM = 60000/runningTotal;               // how many beats can fit into a minute? that's BPM!
      QS = true;                              // set Quantified Self flag 
      // QS FLAG IS NOT CLEARED INSIDE THIS ISR
    }                       
  }

  if (Signal &lt; thresh &amp;&amp; Pulse == true)
    {   // when the values are going down, the beat is over
      Pulse = false;                         // reset the Pulse flag so we can do it again
      amp = P - T;                           // get amplitude of the pulse wave
      thresh = amp/2 + T;                    // set thresh at 50% of the amplitude
      P = thresh;                            // reset these for next time
      T = thresh;
    }

  if (N &gt; 2500)
    {                           // if 2.5 seconds go by without a beat
      thresh = 512;                          // set thresh default
      P = 512;                               // set P default
      T = 512;                               // set T default
      lastBeatTime = sampleCounter;          // bring the lastBeatTime up to date        
      firstBeat = true;                      // set these to avoid noise
      secondBeat = false;                    // when we get the heartbeat back
    }

  sei();                                   // enable interrupts when youre done!
}// end isr
</code></pre>

<p>This is the error code I get</p>

<pre><code>Arduino: 1.8.10 (Windows 10), Board: "Arduino Uno"

Tone.cpp.o (symbol from plugin): In function `timer0_pin_port':

(.text+0x0): multiple definition of `__vector_7'

sketch\Heart_Beat_Sensor_Code.ino.cpp.o (symbol from plugin):(.text+0x0): first defined here

collect2.exe: error: ld returned 1 exit status

Multiple libraries were found for "PulseSensorPlayground.h"
 Used: C:\Users\amaan\Documents\Arduino\libraries\PulseSensor_Playground
exit status 1
Error compiling for board Arduino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -&gt; Preferences.
</code></pre>
 4143: <p>Both the <code>tone()</code> command and the <code>PulseSensor_Playground</code> library use Timer 0's interrupt.  That means there are two implementations of the ISR for that interrupt. However you can only have one implementation of a function or ISR, so it conflicts.</p>

<p>You will have to modify the <code>PulseSensor_Playground</code> library to use a different timer. There may be a way in the code already (some libraries implement such a thing) - if not then you'll have to rewrite the library to use another timer.</p>
